title: Effect of ultrasonic treatment of palygorskite on the catalytic performance of Pd-Cu/palygorskite catalyst for room temperature CO oxidation in humid circumstances.
abstract: Pd-Cu/palygorskite catalysts were prepared by a wet impregnation method using palygorskite (PC/N-Pal) and ultrasonic-treated palygorskite (PC/U-Pal) as the support. Their catalytic activities toward CO oxidation at room temperature and in humid circumstances were investigated. PC/U-Pal exhibits much higher catalytic activity and stability than PC/N-Pal under the conditions of 1.0 vol.% CO and 3.3 vol.% H2O in the feed gas. The X-ray diffraction results indicate that quartz impurities were eliminated from the Pal after the ultrasonic treatment, and more copper species exist in the form of Cu2Cl(OH)3in PC/U-Pal. The temperature-programmed reduction results suggest that there is an enhanced reducibility of PC/U-Pal after ultrasonic treatment. Furthermore, the ultrasonic treatment can properly decrease the hydrophilicity of the support and catalyst, which may also contribute to the excellent catalytic performance.
authors.affiliation: a School of Chemistry and Chemical Engineering, Engineering Research Center of Ministry of Education for Fine Chemicals , Shanxi University , Taiyuan , People's Republic of China.
authors.forename: Yongzhao
authors.initials: Y
authors.lastname: Wang
authors.affiliation: a School of Chemistry and Chemical Engineering, Engineering Research Center of Ministry of Education for Fine Chemicals , Shanxi University , Taiyuan , People's Republic of China.
authors.forename: Yongning
authors.initials: Y
authors.lastname: Wang
authors.affiliation: a School of Chemistry and Chemical Engineering, Engineering Research Center of Ministry of Education for Fine Chemicals , Shanxi University , Taiyuan , People's Republic of China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Li
authors.affiliation: b Ministry of Education Key Laboratory of Applied Surface and Colloid Chemistry, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xian , People's Republic of China.
authors.forename: Zhaotie
authors.initials: Z
authors.lastname: Liu
authors.affiliation: a School of Chemistry and Chemical Engineering, Engineering Research Center of Ministry of Education for Fine Chemicals , Shanxi University , Taiyuan , People's Republic of China.
authors.forename: Yongxiang
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D002384:Catalysis; D017616:Magnesium Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D017655:Silicon Compounds / Q000737:chemistry*; D013696:Temperature; D014465:Ultrasonics
chemical_list: D017616:Magnesium Compounds; D017655:Silicon Compounds; C026325:attapulgite
keywords: Pd-Cu/palygorskite; humid circumstances; hydrophilicity; room temperature CO oxidation; ultrasonic treatment