Preparation and reaction mechanism of novel Ce_(x)Co_(y)Cuz oxide composite catalysts towards oxidation of o-xylene  

作　　者：Mengge Zhao Weijian Cai Jiwu Li 

机构地区：[1]School of Environmental Science and Engineering,Zhejiang Gongshang University,Hangzhou 310018,China [2]Department of Chemistry,School of Food Science and Biotechnology,Zhejiang Gongshang University,Hangzhou 310018,China

出　　处：《Journal of Rare Earths》2022年第10期1573-1583,共11页稀土学报（英文版）

基　　金：Project supported by the Zhejiang Provincial Natural Science Foundation of China (LY20E080003);。

摘　　要：Ce_(x)Co_(y)Cuzoxide composite catalysts were prepared by using polyethylene glycol, citrate sol-gel method combined with PMMA template for the oxidation of o-xylene. The catalysts were characterized by the Xray diffraction(XRD), H2-temperature programmed reduction(H2-TPR), X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectroscopy(FT-IR), etc. The catalytic activity for o-xylene was investigated. The catalytic degradation pathway and mechanism of o-xylene were inferred. The results show that Ce O_(2)is mainly present on the surface of all catalysts. The surface area of Ce_(2)Co1Cu1is up to 77.2 m^(2)/g, and the average pore size is 10.62 nm. It exhibits redox and sufficient Ce^(4+)and Ce^(^(3+)), and reactive oxygen species, and has maximum O-H and C=O in the five catalyst samples. The catalytic activity of Ce2Co1Cu1is the best at low temperature, with the T50and T90values of 235 and 258°C at a space velocity of 32000 h-1, respectively. The o-xylene is oxidized to o-methyl benzaldehyde, and then further oxidized to o-methylbenzoic acid, and finally CO_(2)and H2O are formed.

关 键 词：Ce_(x)Co_(y)Cuz composite oxide catalyst Polyethylene glycol Citrate sol-gel method Catalytic activity O-XYLENE Rare earths 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]