Catalysis Surveys from Asia | 2019
Preparation and Characterization of Carbon Modified Pd-Cu/Palygorskite for Room-Temperature CO Oxidation Under Moisture-Rich Conditions
Abstract
Pd–Cu/Palygorskite catalysts were prepared by a deposition precipitation method using palygorskite (PC/Pal) and carbon modified palygorskite (PC/Pal-C) as supports, respectively. Their catalytic activities toward CO oxidation at room temperature and in humid circumstances were investigated. It is found that PC/Pal-C exhibits much higher catalytic activity and stability than PC/Pal for room-temperature CO oxidation under moisture-rich conditions. X-ray photoelectron spectroscopy (XPS) and H2-TPR results indicate that the more active Pd2+ and highly dispersed Cu2Cl(OH)3 species present on the PC/Pal-C, which promotes the higher catalytic activity. The thermogravimetric (TG) and water contact angles (CA) results suggest that the slightly enhanced hydrophobicity of PC/Pal-C could properly restrain the moisture condensation on the catalyst surface, which may account for the excellent catalytic stability. The more surface active species and the proper hydrophobicity may be responsible for the excellent catalytic performance of PC/Pal-C.