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Wyświetlanie 1-10 z 24
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:
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:
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:
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:
Synthesis and Thermal Properties of Europium-Cerium Oxide as a New Fluorite-Type Ceramic Material for Thermal Barrier Coatings Applications
Autorzy:
Mikuśkiewicz, M.
Stopyra, M.
Moskal, G.
Powiązania:
https://bibliotekanauki.pl/articles/352272.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TBC
cerium oxide
europium oxide
thermal properties
Opis:
In the present paper the structure and thermal properties of europium cerium oxides were investigated. The material for the research was obtained via solid state synthesis. The initial powders: ceria CeO2 and europia Eu2O3 were mixed in 1:1 mass ratio (non-stoichiometric proportion with the excess of CeO2) and milled. The sintering process was performed using high temperature vacuum press at 1350°C. Calorimetric analysis was conducted both for initial powders and milled mixture. The structure, phase composition and thermal diffusivity of obtained material were investigated in as-sintered condition. It was revealed that the obtained material was multi-phase. Non-stoichiometric phases including Ce0.5Eu0.5O1.75 with fluorite type structure and different lattice parameters were present. Thermal diffusivity decreased in the range from 25 to 900°C from 1.49 to 0.57 mm2 /s and then increased to 0.70 mm2 /s at 1400°C.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 2089-2093
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
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
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:
Hydrothermal fabrication of CeVO4 nanoflowers assisted effective photocatalytic mineralization of aqueous methylene blue solution
Autorzy:
Muthuvel, I.
Jayasri, U.
Gowthami, K.
Kumar, N. Dinesh
Thirunarayanan, G.
Balakrishnan, K.
Rajachandrasekar, T.
Powiązania:
https://bibliotekanauki.pl/articles/1031461.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CeVO4
Cerium vanadate
Methylene Blue
Photocatalyst
Wastewater treatment
Opis:
A tetragonal zircon type cerium vanadate (CeVO4) photocatalyst was successfully synthesized hydrothermal method using Ce(NH4)2(NO3)6 and NH4VO3. The products were characterized using the FT-IR, XRD, FE-SEM and UV-DRS. The XRD results show that crystallite size of cerium vanadate is 27.2 nm. The effect of operational parameters such as effect of pH, catalyst suspension, initial dye concentration and reusability were observed. Hence the catalyst can be reused for continuous treatment of wastewater.
Źródło:
World Scientific News; 2020, 142; 103-119
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena cytotoksycznego działania nanocząstek tlenku ceru
Cytotoxicity of cerium oxide nanoparticles
Autorzy:
Zapór, L.
Powiązania:
https://bibliotekanauki.pl/articles/2072974.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
nanocząstki tlenku ceru
nanoceria
cytotoksyczność
cerium oxide nanoparticles
cytotoxicity
Opis:
Nanometryczny tlenek ceru z uwagi na szerokie zastosowanie wymaga oceny toksykologicznej. W pracy oceniano cytotoksyczne działanie nanocząstek tlenku ceru (< 25 nm) na komórki układu oddechowego (A549) i rozrodczego (CHO-9). Wykazano, że nanotlenek ceru może działać cytotoksycznie powodując zaburzenia metabolizmu komórkowego i zmiany w przepuszczalności błon komórkowych. Wartości dawek cytotoksycznych wynosiły 30÷200 μg/cm3 w zależności od rodzaju komórek oraz badanego efektu toksycznego.
Cerium oxide nanoparticles (nanoceria) require the toxicological evaluation due to their wide application. The cytotoxic action of cerium oxide nanoparticles (< 25 nm) on cells of the respiratory (A549) and reproductive (CHO-9) systems were investigated. It was shown that nanoceria exhibited cytotoxic effects causing cellular metabolism disturbances and changes in the permeability of cell membranes. Cytotoxicity doses were equal to 30÷200μg/cm3 depending on a kind of cells and cytotoxicity endpoint.
Źródło:
Inżynieria i Aparatura Chemiczna; 2014, 4; 326--327
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Aluminium on Graphitization of Cast Iron Treated with Cerium Mixture
Autorzy:
Soiński, M. S.
Jakubus, A.
Kordas, P.
Skurka, K.
Powiązania:
https://bibliotekanauki.pl/articles/380446.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast iron
aluminium
graphitization
cerium mixture
żeliwo
grafityzacja
cer
Opis:
The work determined the influence of aluminium in the amount from about 0.6% to about 8% on graphitization of cast iron with relatively high silicon content (3.4%-3.9%) and low manganese content (about 0.1%). The cast iron was spheroidized with cerium mixture and graphitized with ferrosilicon. It was found that the degree of graphitization increases with an increase in aluminium content in cast iron up to 2.8%, then decreases. Nodular and vermicular graphite precipitates were found after the applied treatment in cast iron containing aluminium in the amount from about 1.9% to about 8%. The Fe3AlCx carbides, increasing brittleness and deteriorating the machinability of cast iron, were not found in cast iron containing up to about 6.8% Al. These carbides were revealed only in cast iron containing about 8% Al.
Źródło:
Archives of Foundry Engineering; 2014, 14, 2; 95-100
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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