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Tytuł:
Cerium-Promoted Nickel /Alumina Catalyst for Producer Gas Reforming and Tar Conversion
Autorzy:
Aljbour, Salah H.
Kawamoto, Katsuya
Powiązania:
https://bibliotekanauki.pl/articles/2105271.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
cerium
nickel
tar
naphthalene
catalyst
gasification
reforming
Opis:
The catalytic conversion of a model tar compound, namely: naphthalene contained in a simulated producer gas from wood gasification process was investigated. The sol-gel approach was used to create a mesoporous Cepromoted Ni/alumina catalyst with high surface area. A surface area of 333 m2g was achieved by calcination of the mesoporous catalyst (17 wt% Ni and 2.8 wt% Ce) under air conditions at 1123 K. The catalysts were characterized using the N2 adsorption-desorption, XRD, and SEM techniques, and their promotion effect on producer gas reforming and tar removal was studied under dry, steam, and partial oxidation conditions. The Ni-based catalysts effectively converted naphthalene and increased the proportion of H2 and CO in the reformed gas. Incorporating Ce into the catalyst increased the proportion of H2 and CO in the reformed gas, while lowering the amount of CH4 and CO2. In the absence of oxygen, catalytic reforming of the producer gas resulted in 79.6% naphthalene conversion, whereas catalytic partial oxidation conditions resulted in 99.1% naphthalene conversion.
Źródło:
Journal of Ecological Engineering; 2022, 23, 6; 58--66
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dwutlenek toru i dwutlenek ceru osadzone na nośnikach węglowych oraz dotowane rodem jako katalizatory transformacji butan-1-olu
Thorium dioxide and cerium dioxide deposited on carbon supports and dotted with rhodium used as catalysts for the transformation of butan-1-ol
Autorzy:
Czechowski, Franciszek
Klimkiewicz, Roman
Powiązania:
https://bibliotekanauki.pl/articles/2030629.pdf
Data publikacji:
2020
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
nośniki węglowe
katalizatory odwodornienia
dwutlenek ceru
dwutlenek toru
carbonaceous supports
dehydrogenation catalysts
cerium dioxide
thorium dioxide
Opis:
Zastosowano materiały węglowe – węgle aktywne - wytworzone z węgla brunatnego i z węgla kamiennego w roli nośników katalizatorów heterogenicznych. W tym celu skomponowano katalizatory z dwutlenkiem ceru i dwutlenkiem toru osadzonymi na tych węglach aktywnych. Katalizatory te zawierały 5,7% tlenku metalu. Ponadto katalizatory cerowe i torowe nośnikowane na węglu aktywnym z węgla brunatnego dodatkowo dotowano rodem w ilości 2,3%. Specyfikę aktywności i selektywności katalizatorów badano stosując jako reakcję testową konwersję butan-1-olu w zakresie temperatur 300 – 460C. Transformacje butan-1-olu przebiegały bez udziału tlenu cząsteczkowego, były zatem z założenia niedestruktywne dla powierzchni nośników węglowych. Na katalizatorach zawierających tlenek ceru lub tlenek toru zachodziło odwodornienie butan-1-olu i następcza dwucząsteczkowa kondensacja do heptan-4-onu z selektywnością ponad 70%. Natomiast obydwa tlenki dotowane rodem katalizowały konwersję butan-1-olu głównie do butanianu n-butylu z selektywnością ponad 50%. Zatem tlenek toru, także dotowany rodem, jest porównywalnie wysoko selektywnym katalizatorem jak wielokrotnie sprawdzony tlenek ceru w kierunkach, odpowiednio, kondensacji do ketonu symetrycznego lub bezpośredniej transformacji do estru. Wyniki uzyskane z zastosowaniem węgli aktywnych wytworzonych z węgla brunatnego i z węgla kamiennego różni aktywność katalityczna. Katalizatory naniesione na węgiel aktywny z węgla brunatnego cechuje kilkuprocentowo wyższa konwersja, a zatem i wydajność ketonu, od tych wartości uzyskanych na ich odpowiednikach naniesionych na węgiel aktywny z węgla kamiennego. Pozytywne wyniki testów wskazują na korzyści z zastosowania badanych materiałów węglowych jako nośników katalizatorów, pozwalających na dużą redukcję ilości materiałów katalitycznie aktywnych.
Carbon materials - activated carbons – obtained from lignite and hard coal were used as carriers for heterogeneous catalysts. For this purpose, catalysts with cerium dioxide and thorium dioxide loaded on these activated carbons were composed. The catalysts contained 5.7% of metal oxide. Furthermore, cerium and thorium catalysts supported on lignite activated carbon were additionally enriched with rhodium in the amount of 2.3%. The specifics of the activity and selectivity of the catalysts was assessed in the conversion of butan-1-ol at the temperature range of 300 - 460C as a test reaction. The butan-1-ol transformations processed without the accessibility of molecular oxygen and, therefore, the conditions were non- -destructive for the surface of carbon carriers. On catalysts containing cerium oxide or thorium oxide, dehydrogenation of butan-1-ol and subsequent bimolecular condensation to heptan-4-one took place with a selectivity of over 70%. On the other hand, both oxides dotted with rhodium catalyzed the conversion of butan-1-ol mainly to n-butyl butanoate with a selectivity of over 50%. Therefore, thorium oxide, also enriched with rhodium, is a relatively highly selective catalyst as a repeatedly proven cerium oxide in the directions of condensation to symmetric ketone or direct transformation to ester, respectively. The results obtained with the use of activated carbon supports obtained from lignite and hard coal differ in their catalytic activity. Catalysts supported on activated carbon from lignite are characterised by a few percent higher conversion and, therefore, yield of ketone than those supported on activated carbon from hard coal. Positive test results indicate beneficial use of the activated carbons as catalyst supports allowing considerable reduction in the amount of catalytically active materials.
Źródło:
Górnictwo Odkrywkowe; 2020, 61, 4; 10--20
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Catalytic activity of cobalt and cerium catalysts supported on calcium hydroxyapatite in ethanol steam reforming
Autorzy:
Dobosz, J.
Hull, S.
Zawadzki, M.
Powiązania:
https://bibliotekanauki.pl/articles/779330.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
hydroxyapatite
cobalt
cerium
ethanol steam reforming
hydrogen production
Opis:
In this paper, Co,Ce/Ca10(PO4)6(OH)2 catalysts with various cobalt loadings for steam reforming of ethanol (SRE) were prepared by microwave-assisted hydrothermal and sol-gel methods, and characterized by XRD, TEM, TPR-H2, N2 adsorption-desorption measurements and cyclohexanol (CHOL) decomposition tests. High ethanol conversion (close to 100%) was obtained for the catalysts prepared by both methods but these ones prepared under hydrothermal conditions (HAp-H) ensured higher hydrogen yield (3.49 mol H2/mol C2H5OH) as well as higher amount of hydrogen formed (up to 70%) under reaction conditions. The superior performance of 5Co,10Ce/HAp-H catalyst is thought to be due to a combination of factors, including increased reducibility and oxygen mobility, higher density of basic sites on its surface, and improved textural properties. The results also show a significant effect of cobalt loading on catalysts efficiency in hydrogen production: the higher H2 yield exhibit catalysts with lower cobalt content, regardless of the used synthesis method.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 3; 59-67
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Arsenate removal on the ion exchanger modified with cerium(III) ions
Autorzy:
Dudek, Sebastian
Kołodyńska, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/2146888.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
arsenic
adsorption
cerium
iron oxides
Ferrix A33E
Opis:
The iron oxide ion exchanger Ferrix A33E was successfully modified with cerium(III) ions to obtain Ferrix A33E-Ce(III) providing much better sorption properties in relation to the As(V) species. The new material has been characterized using a number of techniques including scanning electron microscopy SEM, nitrogen adsorption/desorption isotherms, Fourier transform infrared spectroscopy FTIR and X-ray photoelectron spectroscopy XPS. At optimal pH 6 the main mechanism of arsenate adsorption on A33E-Ce(III) was electrostatic attraction and formation of monodentate and bidentate surface complexes. The process was exothermic and spontaneous. Unlike the unmodified ion exchanger, A33E-Ce(III) could completely remove arsenic from the arsenate solution at a concentration of 50 mg/dm3 in 60 minutes. Furthermore, the maximum sorption capacity for As(V) was determined to be 60.41 mg/g which almost doubled after modification with cerium(III) ions. It is also worth noting that even after three cycles of sorption/desorption A33E-Ce(III) exhibited a higher sorption capacity than unmodified A33E before the arsenate adsorption. It can be concluded that modifying the sorbent with a small amount of cerium(III) ions boosts its sorption properties significantly, improves effectiveness of water purification and reduces the overall operation cost
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 2 (Special issue - selected papers conference: Physicochemistry of interfaces - instrumental methods); art. no. 147412
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tworzywo korundowe modyfikowane związkami ceru
Corundum material modifed with cerium compounds
Autorzy:
Dziubak, C.
Taźbierski, P.
Powiązania:
https://bibliotekanauki.pl/articles/907108.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
tworzywo korundowe
modyfikacja
dwutlenek ceru
spiekalność
tlenek glinu
corundum material
modification
cerium dioxide
sinterability
aluminum
Opis:
Nieliczne informacje literaturowe wskazują na możliwość modyfikacji właściwości fizyczno-mechanicznych tworzyw glinowych za pomocą związków ceru. Dotychczas tlenek ceru znany był jako materiał polerski oraz katalizator procesów chemicznych ze względu na utleniające właściwości jonów Ce4+. Wykonano badania spiekalności dwóch odmian tlenku glinu z dodatkiem związków ceru. Przedstawiono wyniki twardości, porowatości i wytrzymałości mechanicznej otrzymanych tworzyw i interpretację w zależności od jakości składu fazowego i mikrostruktury.
Few information in the literature show possibility of modifying the physico-mechanical characteristic of the alumina material, using cerium compounds. Due to the Ce4+ ions’ oxidizing properties, cerium dioxide has been known till now as polishing material as well as chemical process catalyst. Sinterability research, of two different alumina materials with various amounts of cerium salt and cerium dioxide additive, has been done. Hardness, porosity, mechanical strength of received composite as well as discussion, according to the phase composition quality and microstructure, has been presented.
Źródło:
Prace Instytutu Ceramiki i Materiałów Budowlanych; 2015, R. 8, nr 20, 20; 7-22
1899-3230
Pojawia się w:
Prace Instytutu Ceramiki i Materiałów Budowlanych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioactive black glasses and their modification with cerium
Autorzy:
Gawęda, M.
Długoń, E.
Sitarz, M.
Powiązania:
https://bibliotekanauki.pl/articles/286185.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
bioactive glasses
cerium
modification
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 122
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Redox conditions, glacio-eustasy, and the status of the Cenomanian-Turonian Anoxic Event: new evidence from the Upper Cretaceous Chalk of England
Autorzy:
Jeans, Christopher V.
Wray, David S.
Williams, C. Terry
Bland, David J.
Wood, Christopher J.
Powiązania:
https://bibliotekanauki.pl/articles/1835600.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cretaceous
Cenomanian–Turonian Anoxic Event
eustatic lithocycles
glacial associations
redox conditions
cerium anomalies
carbon isotopes
NW Europe
Japan
kreda
cenoman
turon
asocjacje
redoks
izotopy węgla
północno-zachodnia Europa
Japonia
Opis:
The nature of the Cenomanian–Turonian Oceanic Anoxic Event (CTOAE) and its δ13 C Excursion is considered in the light of (1) the stratigraphical framework in which the CTOAE developed in the European shelf seas, (2) conclusions that can be drawn from new detailed investigations of the Chalk succession at three locations in England, at Melton Ross and Flixton in the Northern Province where organic-rich ‘black bands’ are present, and at Dover in the Southern Province (part of the Anglo-Paris Basin) where they are absent, and (3) how these conclusion fit in with the present understanding of the CTOAE. The application of the cerium anomaly method (German and Elderfield 1990) at Dover, Melton Ross and Flixton has allowed the varying palaeoredox conditions in the Chalk Sea and its sediments to be related to the acid insoluble residues, organic carbon, δ18O (calcite), δ13C (calcite), δ13C (organic matter), Fe 2+ and Mn2+ (calcite), and P/TiO2 (acid insoluble residue). This has provided evidence that the initial stages of the δ13C Excursion in England were related to (1) a drop of sea level estimated at between 45 and 85 metres, (2) influxes of terrestrial silicate and organic detritus from adjacent continental sources and the reworking of exposed marine sediments, and (3) the presence of three cold water phases (named the Wood, Jefferies and Black) associated with the appearance of the cold-water pulse fauna during the Plenus Cold Event. Conditions in the water column and in the chalk sediment were different in the two areas. In the Northern Province, cerium-enriched waters and anoxic conditions were widespread; the δ13C pattern reflects the interplay between the development of anoxia in the water column and the preservation of terrestrial and marine organic matter in the black bands; here the CTOAE was short-lived (~0.25 Ma) lasting only the length of the Upper Cenomanian Metoicoceras geslinianum Zone. In the Southern Province, water conditions were oxic and the δ13C Excursion lasted to the top of the Lower Turonian Watinoceras devonense Zone, much longer (~1.05 Ma) than in the Northern Province. These differences are discussed with respect to (1) the Cenomanian–Turonian Anoxic Event (CTAE) hypothesis when the ocean-continent-atmosphere systems were linked, (2) limitations of chemostratigraphic global correlation, and (3) the Cenomanian-Turonian Anoxic Event Recovery (CTOAER), a new term to define the varying lengths of time it took different oceans and seas to recover once the linked ocean-continent-atmosphere system was over. The possibility is considered that glacio-eustasy (the glacial control hypothesis of Jeans et al. 1991) with the waxing and waning of polar ice sheets, in association with the degassing of large igneous provinces, may have set the scene for the development of the Cenomanian-Turonian Anoxic Event (CTAE).
Źródło:
Acta Geologica Polonica; 2021, 71, 2; 103-152
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Rare Earth Metals on Microstructure and Inclusions Morphology G17CrMo5-5 Cast Steel
Wpływ metali ziem rzadkich na strukturę i morfologię wtrąceń w staliwie G17CrMo5-5
Autorzy:
Kasińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/355689.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast steel
modification
rare earth metals
non-metallic inclusions
cerium
staliwo
modyfikacja
metale ziem rzadkich
wtrącenia niemetaliczne
cer
Opis:
This paper presents influence of rare earth metals (REM) on the microstructure and morphology of non-metallic inclusions of G17CrMo5-5 cast carbon steel The research has been performed on successive industrial melts. Each time about 2000 kg of liquid metal was modified. The REM was in the form of mishmetal of the composition 49,8% Ce, 21, 8% La, 17, 1% Nd, 5, 5% Pr and 5, 35% the rest of REM. Therareearth metals were put into the ladle during tapping of heat melt from the furnace.
W artykule przedstawiono rolę metali ziem rzadkich na strukturę I morfologię wtrąceń niemetalowych w staliwie węglowym G17CrMo5-5. Badania prowadzono na seryjnych wytopach przemysłowych. Każdorazowo modyfikacji poddawano po około 2000kg ciekłego metalu. Metale ziem rzadkich wprowadzano w postaci miszmetalu o składzie: 49, 8% Ce, 21, 8% La, 17, 1% Nd, 5, 5% Pr and 5, 35%. Metale ziem rzadkich wprowadzano do kadzi podczas spustu ciekłego metalu z pieca.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 993-996
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Recovery of Cerium by Leaching Solvents from NiMH Waste Battery
Autorzy:
Kim, Boram
Kim, Dae-Weon
Choi, Hee Lack
Powiązania:
https://bibliotekanauki.pl/articles/2203709.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
NiMH
cerium recovery
rare earth composite powder
Opis:
In this study, a rare earth composite precipitation (NaREE(SO4)2H2O, REE: Ce, La, Nd, Pr) powder was prepared from spent nickel hydride batteries, and cerium hydroxide was separated from its constituent rare earth elements. As Ce(OH)3 can be oxidized more easily than other rare earth elements (La, Nd, and Pr), Ce3+ was converted to Ce4+ by injecting air into the leachate at 80°C for 4 h. The oxidized powder was leached using sulfuric and hydrochloric acids. Because Ce(OH)4 has low solubility, it can be separated from other elements. Therefore, the pH of the leaching solution was adjusted for selective precipitation. To determine the crystalline phase, recovery, and grade of the recovered Ce(OH)4, the powders were analyzed using X-ray diffraction, scanning electron microscopy, and inductively coupled plasma optical emission spectroscopy. The grade and recovery rates of the Ce(OH)4 powder recovered from the rare earth composite precipitate using sulfuric acid as the solvent were 95% and 97%, respectively, whereas those of the powder recovered using hydrochloric acid were 96% and 95%, respectively.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 103--106
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ nanocząstek tlenku ceru na aktywność powierzchniową surfaktantu płucnego
The Influence of Cerium Oxide Nanoparticles on the Surface Activity of Pulmonary Surfactant
Autorzy:
Kondej, D.
Sosnowski, T. R.
Powiązania:
https://bibliotekanauki.pl/articles/1818044.pdf
Data publikacji:
2016
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
tlenek ceru
nanocząstki
surfaktant płucny
aktywność powierzchniowa
cerium oxide
nanoparticles
pulmonary surfactant
surface activity
Opis:
In recent years there has been an intensive development of industries that use or produce materials in the nano scale. Nanomaterials contribute to the improvement of the product parameters, but when inhaled can also negatively affect the human body. The aim of the study was to investigate the effect of cerium oxide nanoparticles on the surface activity of pulmonary surfactant (PS) forming a thin film separating the inhaled air from the alveolar epithelium. Three types of cerium oxide powders were used (Sigma-Aldrich): C1 having a particle size smaller than 25 nm, C2 having a particle size smaller than 50 nm, and for comparison purposes C3 having a particle size smaller than 5 µm. Measurement of specific surface area was carried out using a Gemini 2360 surface area analyzer (Micromeritics, USA). The effect of cerium oxide nanoparticles on the surface activity of PS was studied using DeltaPi microtensiometer (Kibron Inc., Finland). Reconstituted animal surfactant preparation (Beractantum; Abbott Laboratories, France) recommended in states of deficiency of endogenous PS in newborn premature infants, was used as model PS. The tests were carried out at different particle concentrations (ranging up to 1 mg/ml) prepared with the constant concentration of the surfactant solution (1.25 mg phospholipids/ml). The study showed that in all the analyzed cases, the presence of cerium oxide particles caused an increase in surface pressure (lowering of the surface tension) at the liquid-air interface. It was found that the intensity of these changes depends on the particle size, specific surface area and the particle concentration. With the increase in concentrations of the particles in the model surfactant suspension, a greater difference in surface pressure/tension was observed with respect to the initial value. The largest increase in surface pressure (6.4 ± 1.1 mN/m) was observed in the presence of cerium oxide nanoparticles C1, which were characterized by the smallest dimensions (smaller than 25 nm) and the largest surface area (33.3 m2/g). The results show that cerium oxide nanoparticles may have an influence on the surface activity of pulmonary surfactant in vivo and adversely affect the functioning of the human respiratory system.
Źródło:
Rocznik Ochrona Środowiska; 2016, Tom 18, cz. 2; 146-157
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lantan i cer w glebach Polski
Autorzy:
Kwecko, P.
Powiązania:
https://bibliotekanauki.pl/articles/2074972.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
lanthanum
cerium
REE
soils
Polska
lantan
cer
gleby
Polska
Opis:
The paper present basic spatial analysis lanthanum and cerium distribution in Poland soils. Attempted to determine geochemical background and range and intensity of enrichment and anomalies La and Ce content in top (0–0,2 m) and bottom (0,5–2 m) soils. These data are presented in the form two color maps of polygonal with basic statistic information. The text part describes the main areas of enrichment and attempts to indicate the source of these values.
Źródło:
Przegląd Geologiczny; 2012, 60, 9; 490--495
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recycling of Cerium and Lanthanum from Glass Polishing Sludge
Autorzy:
Lee, Chi-En Hung
Lo, Yu-Chien
Sandagdorj, Nyamdorj
Gankhuyag, Enkhsaikhan
Popuri, Srinivasa Rao
Hung, Chi-En
Powiązania:
https://bibliotekanauki.pl/articles/779586.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Cerium
Lanthanum
Waste
Sludge
Leaching
Recycling
Opis:
To examine the efficiency of La and Ce recycling processes from the sludge, two major methods were used, namely leaching and precipitation. The findings suggest that 12% of La and 24.2% of Ce were contained in the sludge. The sludge was leached in an optimum condition of 6N HCl at a temperature of 70°C with a 3g/50 mL solid/liquid ratio for 3 h to obtain a 100% leaching recovery of La and Ce. After pH adjustment of the obtained La and Ce optimum leaching solution to 6 with NH4OH and a simultaneous addition of H2O2 in a ratio of 1:1, Ce precipitated out with 65.9% recovery. On the other hand, La was not precipitated. The results obtained in this study reveal that leaching and pH adjustment method could be used to recover the valuable REE of La and Ce from glass polishing sludge in order to reach the goals of resource recycling.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 4; 26-30
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Sensitivity of Autotrophic and Heterotrophic Microorganisms to the Pollution of Natural Water with Rare Earth Elements (Lanthanum and Cerium)
Autorzy:
Lozhkina, Roza A.
Olkova, Anna S.
Koval, Ekaterina V.
Tomilina, Irina I.
Sysolyatina, Maria A.
Powiązania:
https://bibliotekanauki.pl/articles/2086379.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
rare earth elements
lanthanum
cerium
bioassay
Nostoc linckia
Chlorella vulgaris
Paramecium caudatum
Escherichia coli
Opis:
The purpose of the work was to compare the sensitivity of autotrophic and heterotrophic organisms used in bioassay to lanthanum and cerium under the conditions of a model experiment with aqueous media. Using bioassay methods, the pre-lethal effects of La and Ce in heterotrophic Paramecium caudatum and Escherichia coli, as well as autotrophic Chlorella vulgaris and Nostoc linckia were determined. Model solutions of La2 (SO4)3∙8H2O and Ce2 (SO4)3∙8H2O were tested in the concentration range of 0.1–200 mg/l. As a result, it was shown that heterotrophic organisms are more sensitive to water pollution with La and Ce than autotrophic ones. According to the totality of experiments, cerium turned out to be more toxic than lanthanum. When planning the environmental studies of wastewater or reservoirs polluted with REE, it is recommended to focus on comparative sensitivity of bioassay methods, taking into account the test-functions used: bioassay for chemotaxis of P. caudatum > bioassay for changes in bioluminescence of E. coli (strain M-17) > bioassay for the content of chlorophyll а and intensity of lipid peroxidation in N. linckia > bioassay on the increase in the number of Cl. vulgaris.
Źródło:
Journal of Ecological Engineering; 2022, 23, 4; 58--63
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zeolitów cerowych (CeNaY) na odporność radiacyjną smarów ochronnych
An effect of cerium zeolite on radioresistance of the corrosion preveting grease
Autorzy:
Maruszewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/256937.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
zeolit cerowy
smar ochronny
odporność radiacyjna
promieniowanie radiacyjne gamma
cerium zeolite
radioresistance
preveting grease
corrosion
Opis:
Przeprowadzono badania odporności smarów ochronnych typu Akorin z dodatkiem zeolitów cerowych na działanie promieniowania radiacyjnego gamma. Jako dodatków użyto zeolitu CeNaY o stopniach wymiany Na+ na Ce3+ w granicach 10-67%. Stwierdzono, że ze wzrostem stopnia wymiany Na+ na Ce3+ zwiększa się odporność radiacyjna. Praktycznie optymalną odporność uzyskano przy stopniu wymiany 40-50%.
Radioresistance testes of the cerium zeolite (CeNaY) addition on corrosion preventing addition on corrosion preventing grease were made. Cerium zeolite about grade exchange Na+ on Ce3+ 10 - 67% were used. It was observed that in erease cerium quanting an zeolite provokes an increase of radioresistance.
Źródło:
Problemy Eksploatacji; 2006, 3; 75-81
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Thermal Properties of Cerium-Dysprosium Oxide
Autorzy:
Mikuśkiewicz, M.
Stopyra, M.
Moskal, G.
Powiązania:
https://bibliotekanauki.pl/articles/356941.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cerium oxide
dysprosium oxide
hermal properties
TBC
Opis:
The paper presents results of investigation on synthesis and characterization of cerium-dysprosium oxide. The input powders - dysprosium oxide Dy,sub>2O3 and cerium oxide CeO2 - were mixed so as to obtain equimolar ratio of cations, milled in alcohol and synthesized via solid state reaction process at 1350°C under 15MPa in vacuum for 2h. The microstructure, phase composition and thermal properties were analyzed. The obtained material was multiphase. Non-stoichiometric compounds were identified. Thermal diffusivity of investigated material decreased in the temperature range of 25-1000°C from 0,71 to 0,45 mm2/s.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 965-969
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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