Pt-CeO_2/SiO_2 catalyst for CO oxidation in humid air at ambient temperature

作     者：Shirish S.Punde Bruce J.Tatarchuk Shirish S. Punde;Bruce J. Tatarchuk

作者机构：奥本大学化学工程系美国亚拉巴马州奥本市 

出 版 物：《Chinese Journal of Catalysis》 (催化学报（英文）)

年 卷 期：2017年第38卷第3期

页      面：475-488页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by US Army contract(W56HZV-05-C0686) at Auburn University administered through TARDEC 

主　　题：Carbon monoxide oxidation Catalyst Platium Ceria Silica Precursor O_2-H_2 titration Chemisorption Temperature-programmed reduction 

摘      要：CO self-poisoning and slow surface kinetics pose major challenges to a CO oxidation catalyst that should work at ambient ***,the presence of moisture would cause passivation of the catalyst A highly active ceria promoted Pt catalyst（4%Pt-12%CeO_2/SiO_2;conversion≥99%at low（ 500 ppm） and high（ 2500 ppm） CO concentrations was developed for CO oxidation at ambient temperature in humid *** preparation variables such as Pt and CeO_2 loading,ceria deposition method,drying and calcination conditions for the ceria and Pt precursors were optimized *** activity was correlated with surface properties using CO/H_2 chemisorption,O_2-H_2 titration,X-ray diffraction and BET surface area *** method of CeO_2 deposition had a significant impact on the catalytic ***_2 deposition by impregnation resulted in a catalyst that was three times more active than that prepared by deposition precipitation or CeO_2grafting.O_2-H_2 titration results revealed that the close association of ceria and Pt in the case of CeO_2deposition by impregnation resulted in higher *** catalyst support used was also crucial as a silica supported catalyst was five times more active than an alumina supported *** particle size and pore structure of the catalyst support were also crucial as the reaction was diffusion *** drying and calcination conditions of the ceria and Pt precursors also played a crucial role in determining the catalytic *** Pt-CeO_2/SiO_2 catalysts with Pt 2.5 wt%and CeO_2 15 wt%were highly active（TOF 0.02 s^（-1）） and stable（conversion 99%after 15 h） at ambient conditions.