Wszystkie pola: Lanthanum - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

Tytuł:: Cobalt-lanthanum catalyst precursors for ammonia synthesis: determination of calcination temperature and storage conditions
Autorzy:: Zybert, M.
Tarka, A.
Mierzwa, B.
Raróg-Pilecka, W.
Powiązania:: https://bibliotekanauki.pl/articles/778044.pdf
Data publikacji:: 2017
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: ammonia synthesis
catalyst precursor
cobalt
lanthanum
thermal analysis
Opis:: A thermal decomposition of a cobalt-lanthanum catalyst precursor containing a mixture of cobalt and lanthanum compounds obtained by co-precipitation were studied using thermal analysis coupled with mass spectrometry (TG-MS). Studies revealed that the calcination in air at 500°C is sufficient to transform the obtained cobalt precipitate into Co₃ O₄ , but it leads to only partial decomposition of lanthanum precipitate. In order to obtain Co/La catalyst precursor containing La₂ O₃ the calcination in air at the temperature about 800°C is required. However, it is unfavorable from the point of view of textural properties of the catalyst precursor. A strong effect of storage conditions on the phase composition of the studied cobalt-lanthanum catalyst precursor, caused by the formation of lanthanum hydroxide and lanthanum carbonates from La₂ O₃ when contacting with air, was observed.
Źródło:: Polish Journal of Chemical Technology; 2017, 19, 2; 61-66
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Properties and activity of the cobalt catalysts for NH₃ &enspsynthesis obtained by co-precipitation – the effect of lanthanum addition
Autorzy:: Zybert, M.
Karasińska, M.
Truszkiewicz, E.
Mierzwa, B.
Raróg-Pilecka, W.
Powiązania:: https://bibliotekanauki.pl/articles/778653.pdf
Data publikacji:: 2015
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: ammonia synthesis
cobalt catalyst
promoter
lanthanum
coprecipitation
Opis:: In modern research on catalysts for NH₃&enspsynthesis a lot of attention is paid to cobalt. In this work the new catalytic systems based on cobalt are presented. Unsupported cobalt catalysts singly promoted (La or Ba) and doubly promoted (La and Ba) were prepared and tested in NH₃&enspsynthesis reaction under commercial synthesis conditions. Characterization studies revealed that lanthanum plays a role of a structural promoter, which improves the surface of catalyst precursors and prevents from sintering during calcination. However, lanthanum has a negative effect on the reduction of cobalt oxide, but the addition of barium promoter (Co/La/Ba catalyst) diminishes the negative impact of La. The co-promotion of cobalt with lanthanum and barium results in the increasing of the active phase surface and improvement of its activity in NH₃&enspsynthesis.
Źródło:: Polish Journal of Chemical Technology; 2015, 17, 1; 138-143
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Hydroxyapatite Lanthanum Oxide Composites
Autorzy:: Bozkurt, Y.
Pazarlioglu, S.
Gokce, H.
Gurler, I.
Salman, S.
Powiązania:: https://bibliotekanauki.pl/articles/1401437.pdf
Data publikacji:: 2015-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 87.85.jf
Opis:: In the present study a commercially synthetic hydroxyapatite powders (CSHAp) were doped with lanthanum oxide (5 and 10 wt.% La₂O₃). The composite powders were well homogenized and pelleted in an uniaxial mould at 350 MPa. Pelleted green bodies were sintered at five different temperatures. Finally, the effect of La₂O₃ amount on the microstructural and mechanical properties of CSHA was investigated. Microstructural properties were detected by X-ray diffraction patterns (XRD) and scanning electron microscope (SEM). Mechanical properties of the sintered samples were determined by the density, hardness and compression strength measurements. Experimental results show that the mechanical properties of HA can be improved by the doping of La₂O₃
Źródło:: Acta Physica Polonica A; 2015, 127, 4; 1407-1409
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

Tytuł:: Radioisotope tracer study in an indirectly heated rotary dryer
Autorzy:: Pant, H.
Powiązania:: https://bibliotekanauki.pl/articles/147094.pdf
Data publikacji:: 2002
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: holdup
lanthanum-140
mean residence time
radioisotope tracer
residence time distribution
rotary dryer
variance
Opis:: A radioisotope tracer study was carried-out in a pilot scale indirectly heated rotary dryer to measure residence time distribution (RTD) of sand particles. Lanthanum-140 labeled sand was used as a tracer. Mean residence time (MRT) and variance of the tracer distribution curves were calculated from the measured RTD curves. From the calculated MRTs, solid holdup in the dryer was estimated. The qualitative comparison of the dimensionless variance with the data published in the literature led to the conclusion that the rotary dryer behaves as a plug flow system. The results of the study were used to design a full-scale industrial rotary dryer.
Źródło:: Nukleonika; 2002, 47, 4; 173-176
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Materiały dla jednowarstwowych ogniw paliwowych
Materials for single layer fuel cells
Autorzy:: Winiarz, P.
Powiązania:: https://bibliotekanauki.pl/articles/134696.pdf
Data publikacji:: 2016
Wydawca:: ADVSEO
Tematy:: fuel cell
composite material
proton conductor
lanthanum niobate
scanning electron microscopy
x-ray diffraction
Opis:: A composite material, which may be further applied as a single layer fuel cell, was synthesized using solid state synthesis method. Composite consisted of two components. The first was a nanoceramic proton conductor – calcium doped lanthanum niobate. The second one was a nanoceramic semiconductor oxide composed of lithium, nickel and zinc oxides respectively. Structural and electrical investigations were performed on the received material. Scanning electron microscope images showed that the microstructure on the surface of this material is homogeneous. Energy dispersive X-Ray diffraction confirms that the components of the investigated composite are mixed together in a volume of material allowing to current flow through the percolation threshold. Open circuit voltage was changing during measurement from 0.8V to 0.6V. Moreover, the material did not change its structural properties during the current flow, hence it could be a good candidate to the production of single layer fuel cells.
Źródło:: Technical Issues; 2016, 4; 104-109
2392-3954
Pojawia się w:: Technical Issues
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Assessment of a new scintillation crystal (LaBr3) in PET scanners using Monte Carlo method
Autorzy:: Karimian, A. E.
Thompson, Ch. J.
Powiązania:: https://bibliotekanauki.pl/articles/146815.pdf
Data publikacji:: 2008
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: PET
scintillation crystals
Monte Carlo
lanthanum bromide
Opis:: The main aim of this work is to investigate the use of new lanthanum bromide (LaBr3) in whole body PET (WB-PET) scanners and to compare the obtained results with those for BGO and LSO crystals which are currently used in conventional and dedicated PET systems. Our results show that there is a gain in noise effective count rate (NECR) arising from the reduced scatter and random fractions in a LaBr3 scanner. The spatial resolution of the WB-PET with LaBr3 is slightly worse than the LSO and BGO crystals because of its low density and effective atomic number. But our study showed the increased NECR, excellent energy resolution and low decay time of LaBr3 which promise a significant improvement in WB-PET performances especially for narrow coincidence windows.
Źródło:: Nukleonika; 2008, 53, 1; 5-6
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: PZT-Type Ceramics Doped with Manganese, Antimony, Lanthanum and Tungsten - Technology and Physical Properties
Autorzy:: Bochenek, D.
Niemiec, P.
Ćwikiel, E.
Goryczka, T.
Powiązania:: https://bibliotekanauki.pl/articles/353398.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: PZT type ceramics
perovskite type materials
ferroelectrics
doped
Opis:: The work three ceramic compositions based on PbZr_0.49 Ti_0.51O₃ doped with manganese (Mn), antimony (Sb), lanthanum (La) and tungsten (W) were obtained. The introduction of a set of admixtures was aimed at improving the sinterability of ceramic materials and optimizing its electrophysical parameters. Multi-component materials of the PZT-type with a general formula: Pb(PbZr_0.49 Ti_0.51)_0.94 Mn_0.021 Sb_0.016 LayW_z O₃ (where y from 0.008 to 0.012 and z from 0.012 to 0.014) were prepared by the conventional mixed oxide method. After mixing and drying the powder mixtures were calcined in air at 850°C for 4 h, while densification of the powders was carried out by the free sintering method at 1150°C for 2 h. The final steps of technology were grinding, polishing, annealing and putting silver paste electrodes onto both surfaces of the samples for electrical testing. XRD, SEM, EDS, dielectric, ferroelectric, piezoelectric properties and DC electrical conductivity of the obtained ceramic compositions were carried out. X-ray tests of the crystal structure conducted at room temperature have shown that all obtained the PZT-type materials were a single phase (perovskite type) without the presence of a foreign phase. Symmetry of the crystal lattice was identified as space group P4mm. Temperature dielectric studies have shown high values of dielectric permittivity and low dielectric loss. The presented physical properties of ceramic samples based on PZT confirm their predisposition for application in modern microelectronic and micromechatronic applications.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 2; 827-837
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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