Effect of supports over Pd/Fe^sub 2^O^sub 3^ on CO oxidation at low temperature

Effect of supports over Pd/Fe^sub 2^O^sub 3^ on CO oxidation at low temperature

Pd/Fe2O3 catalysts were prepared by deposition-precipitation method and investigated for CO oxidation. Compared with Pd/α-Fe2O3, Pd/γ-Fe2O3 exhibited the higher CO oxidation activity, and CO completely oxidation temperature was obtained at 0 °C. CO oxidation occurred through the dual sites mechanism...

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Bibliographic Details
Published in:Fuel processing technology Vol. 160; p. 152
Main Authors: Wang, Li, Pu, Chunhua, Xu, Lele, Cai, Yafeng, Guo, Yanglong, Guo, Yun, Lu, Guanzhong
Format: Journal Article
Language:English
Published: Amsterdam Elsevier Science Ltd 01-06-2017
Subjects:
Activation
Catalysts
Cobalt
Hematite
Iron oxides
Low temperature
Oxidation
Oxygen
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Summary:Pd/Fe2O3 catalysts were prepared by deposition-precipitation method and investigated for CO oxidation. Compared with Pd/α-Fe2O3, Pd/γ-Fe2O3 exhibited the higher CO oxidation activity, and CO completely oxidation temperature was obtained at 0 °C. CO oxidation occurred through the dual sites mechanism, namely CO adsorbed on Pd species and O activation on the support. The close contact between Pd and γ-Fe2O3 enhanced the redox recycle between Fe3 + and Fe2 + species, which played a decisive role in oxygen activation. The excellent performance in oxygen activation efficiently accelerated the rate-determining step in CO oxidation. The accumulated carbonate and hydrocarbonate species on α-Fe2O3 blocked the oxygen activation which resulted in the low activity of Pd/α-Fe2O3 in CO oxidation.
ISSN:0378-3820
1873-7188