ChemInform Abstract: Perovskite-Type Mixed Oxides as Catalytic Material for NO Removal

ChemInform ◽  
2010 ◽  
Vol 41 (9) ◽  
Author(s):  
Junjiang Zhu ◽  
Arne Thomas
Keyword(s):  
Mixed Oxides ◽  
No Removal ◽  
Catalytic Material ◽  
Perovskite Type

Effect of Complexing Agent on Morphology and Crystal Structure of La1-xCexCoO3 (x=0, 0.2, and 0.4) Perovskite-Type Mixed Oxides Catalyst Prepared by Sol-Gel Method

2010 ◽  
Vol 658 ◽  
pp. 29-32 ◽  
Author(s):  
Kanit Soongprasit ◽  
Duangdao Aht-Ong ◽  
Viboon Sricharoenchaikul ◽  
Duangduen Atong
Keyword(s):  
Crystal Structure ◽  
Polyvinyl Alcohol ◽  
Mixed Oxides ◽  
Sol Gel ◽  
Value Added ◽  
Molar Ratio ◽  
Complexing Agent ◽  
Nitrate Hexahydrate ◽  
Mixed Oxide Catalysts ◽  
Perovskite Type

. La1-xCexCoO3 (x=0, 0.2, and 0.4) perovskite-type mixed oxides using polyvinyl alcohol (PVA) as complexing agent at two molar ratio of metal ion to PVA (1:1 and 1:2) were successfully prepared by sol-gel process. The precursor included lanthanum (II) nitrate hexahydrate, cerium (II) nitrate hexahydrate, and cobalt (II) nitrate hexahydrate where polyvinyl alcohol was added as complexing agent. The suitable condition of Cerium (Ce) substitution and PVA molar ratio were established for further application in hydrocarbon conversion to high value added products. TGA thermogram of as-prepared precursor showed that PVA absolutely decomposed at temperature higher than 500°C. XRD patterns of calcined catalyst showed both LaCoO3 rhombohedral and CeO2 cubic structures that confirmed the formation of mixed crystal structure. Nevertheless, Co3O4 slightly appeared with low peak intensity which came from the oxidation reaction of as-prepared catalyst during calcinations. XRD showed that PVA did not effect to crystal structure of synthesized catalyst. Higher PVA content added in the precursor cause the reduction of crystal growth of catalyst in calcinations step. In contrast, morphology of catalyst is directly related with PVA content such that the spongy and sheet-like structure were formed with increasing PVA content which prevented the agglomeration of particles. The results showed that PVA content play an important role in morphology of perovskite-type mixed oxide catalysts but did not affected to their crystal structures.

Electron Donating, Acid-Base and Catalytic Properties of Perovskite-Type Mixed Oxides of Rare Earths

1995 ◽  
Vol 60 (6) ◽  
pp. 977-982
Author(s):  
S. Sugunan ◽  
V. Meera
Keyword(s):  
Catalytic Activity ◽  
Electron Donor ◽  
Rare Earths ◽  
Electron Affinity ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Surface Acidity ◽  
Electron Acceptors ◽  
Acid Base ◽  
Perovskite Type

The electron donor properties of perovskite-type mixed oxides (LaFeO3, PrFeO3, SmFeO3, LaCoO3, PrCoO3, SmCoO3, LaNiO3, PrNiO3 and SmNiO3) were studied based on the adsorption of electron acceptors exhibiting different electron affinity viz. 7,7,8,8-tetracyanoquinodimethane, 2,3,5,6-tetrachloro-1,4-benzoquinone, p-dinitrobenzene, and m-dinitrobenzene. The surface acidity/basicity of the oxides was determined using a set of Hammett indicators. The data were correlated with the catalytic activity of the oxides for the reduction of cyclohexanone with 2-propanol.

scholarly journals Catalytic Properties of Perovskite-type Mixed Oxides, La1−xSrxCoO3

1982 ◽  
Vol 55 (2) ◽  
pp. 394-399 ◽  
Author(s):  
Teiji Nakamura ◽  
Makoto Misono ◽  
Yukio Yoneda
Keyword(s):  
Mixed Oxides ◽  
Catalytic Properties ◽  
Perovskite Type

Plasma chemical preparation and characterization of perovskite-type mixed oxides

2007 ◽  
Vol 35 (2-4) ◽  
pp. 249-255 ◽  
Author(s):  
A. Dittmar ◽  
M. Schneider ◽  
J. Radnik ◽  
E. Kondratenko ◽  
D. Herein
Keyword(s):  
Mixed Oxides ◽  
Chemical Preparation ◽  
Plasma Chemical ◽  
Perovskite Type

Preparation, Characterization and Photocatalysis Properties of Ultrafine Perovskite-Type LaCoO3

2011 ◽  
Vol 197-198 ◽  
pp. 935-942
Author(s):  
Xia Fu ◽  
Yang Chen ◽  
Gao Qi Yu ◽  
Chao Yu ◽  
Hou Zhi Wang ◽  
...  
Keyword(s):  
Supercritical Fluid ◽  
Mixed Oxides ◽  
Uv Light ◽  
Sol Gel ◽  
Raw Material ◽  
Supercritical Fluid Drying ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Drying Technology ◽  
Perovskite Type

Using La2O3and Co(NO3)2•6H2O as raw material, ultrafine perovskite-type oxides LaCoO3was prepared by Supercritical Fluid Drying Technology and Sol-Gel method. The prepared materials’ crystal structure and morphology were characterized by TG-DTA、XRD、FT-IR and TEM. The photocatalytic activity of ultrafine LaCoO3powders was evaluated by degradation of methyl orange (MO) solution under 15W UV light irradiation. The results show: At 250°C , the amorphous ultrafine La-Co particles with the size less than 10 nm can be obtained by Supercritical Fluid Drying Technology. At 850°C , the size of the particles increased to 15-35nm, the nanocrystalline LaCoO3had a perfect rhombohedral perovskite structure. At 900°C , the crystalline phases of the lanthanum-cobalt mixed oxides were LaCoO3and La2O3, and the amorphous component is Co2O3, the presence of lanthanum affects the crystallization of cobalt oxides. The LaCoO3has excellent photocatalytic activities and 100% MO solution was decolorized only after 4h.

Oxygen storage and catalytic NO removal promoted by CeO2-containing mixed oxides

1998 ◽  
Vol 275-277 ◽  
pp. 877-885 ◽  
Author(s):  
R Di Monte ◽  
P Fornasiero ◽  
M Graziani ◽  
J Kašpar
Keyword(s):  
Mixed Oxides ◽  
Oxygen Storage ◽  
No Removal
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