Citation: KONG Ling-Zhi, WAN Qian, XU Li, YAN Yong-Sheng, LI Hua-Ming, YANG Xiang-Guang. Action of Oxygen Vacancy in CO Catalytic Oxidation over Pt Supported Pervoshkite Oxides[J]. Chinese Journal of Inorganic Chemistry, ;2015, 31(7): 1335-1341. doi: 10.11862/CJIC.2015.163
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LaMnO3, LaFeO3, La0.5Sr0.5MnO3, La0.5Sr0.5FeO3 were prepared by citric acid method and Pt/LaMnO3, Pt/LaFeO3, Pt/La0.5Sr0.5MnO3, Pt/La0.5Sr0.5FeO3 were prepared by impregnating nano-Pt solution to ABO3 mixed oxides. It showed that prepared ABO3 mixed oxides possessed pervoskite structrue from XRD and IR data, the size of nano-Pt particle was about ~3 nm and dispersed uniformly on ABO3 mixed oxides from TEM. It was found that the redox properties determined the catalytic properties of ABO3-type catalsysts in CO catalytic oxidation, thus, Mn-ABO3 catalsysts gave the better activity in CO catalytic oxidation. When supported nano-Pt paricle to ABO3- mixed oxides, Pt/Fe-ABO3 catalsysts showed the excellent activity, the reaction temperature of 100% CO conversion was reduced from 350 ℃ to 120 ℃. Adsorption experiment indicated that oxygen vacancy on ABO3 mixed oxides was a key factor to improve the adsorption of oxygen and to determine the properties of CO oxidation at lower reaction temperatures.
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