Cerium phosphate-supported Au catalysts for CO oxidation  

作　　者：Yulin Wang Huan Liu Zhen Ma 

机构地区：[1]Shanghai Key Lahoratory of Atmospheric Particle Pollution & Prevention ( IAP^3 ), Department of Environmental Sdence & Engineering, Fudan University, Shanghai 200433, China

出　　处：《Chinese Journal of Chemical Engineering》2018年第10期2055-2063,共9页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(21177028 and21477022)

摘　　要：LaPO_4 and hydroxyapatite(Ca_(10)(PO_4)_6(OH)_2)are typical metal phosphates recently found to be useful for making supported metal or metal oxide catalysts,but CePO_4(also belonging to the metal phosphate family)has been rarely used to make supported catalysts.It would be interesting to develop CePO_4-supported catalysts and explore their catalytic applications.Herein,hexagonal CePO_4 nanorods(denoted as CePO_4-H),hexagonal CePO_4 nanowires(CePO_4-HNW),monoclinic CePO_4 nanoparticles(CePO_4-M),and monoclinic CePO_4 nanowires(CePO_4-MNW)prepared by different methods were used to support gold via deposition-precipitation with urea(DPU).The gold contents of these catalysts were all around 1 wt%.The catalytic activities of these Au/CePO_4 catalysts in CO oxidation were found to follow the sequence of Au/CePO_4-MNW>Au/CePO_4-HNW> Au/CePO_4-M>Au/CePO_4-H.These catalysts were characterized by inductively coupled plasma-optical emission spectroscopy(ICP-OES),N_2 adsorption–desorption,X-ray diffraction(XRD),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),oxygen temperature-programmed desorption(O_2-TPD),and CO_2 temperature-programmed desorption(CO_2-TPD)to find possible correlations between the physicochemical properties and catalytic activities of these catalysts.LaPO4 and hydroxyapatite（Ca10（PO4）6（OH）2）are typical metal phosphates recently found to be useful for making supported metal or metal oxide catalysts,but CePO4（also belonging to the metal phosphate family）has been rarely used to make supported catalysts.It would be interesting to develop CePO4-supported catalysts and explore their catalytic applications.Herein,hexagonal CePO4 nanorods（denoted as CePO4-H）,hexagonal CePO4 nanowires（CePO4-HNW）,monoclinic CePO4 nanoparticles（CePO4-M）,and monoclinic CePO4 nanowires（CePO4-MNW）prepared by different methods were used to support gold via deposition-precipitation with urea（DPU）.The gold contents of these catalysts were all around 1 wt%.The catalytic activities of these Au/CePO4 catalysts in CO oxidation were found to follow the sequence of Au/CePO4-MNW〉Au/CePO4-HNW〉 Au/CePO4-M〉Au/CePO4-H.These catalysts were characterized by inductively coupled plasma-optical emission spectroscopy（ICP-OES）,N2 adsorption–desorption,X-ray diffraction（XRD）,transmission electron microscopy（TEM）,X-ray photoelectron spectroscopy（XPS）,oxygen temperature-programmed desorption（O2-TPD）,and CO2 temperature-programmed desorption（CO2-TPD）to find possible correlations between the physicochemical properties and catalytic activities of these catalysts.

关 键 词：GOLD CATALYSIS Catalyst support CEPO4 Carbon monoxide OXIDATION 

分 类 号：TQ426[化学工程]