文献类型：期刊文献

英文题名：Catalytic combustion of chlorinated aromatics over WOx/CeO2 catalysts at low temperature

作者：Gu, Yufeng[1];Cai, Ting[2];Gao, Xiaohui[1];Xia, Hangqi[1];Sun, Wei[1];Zhao, Jian[1];Dai, Qiguang[1];Wang, Xingyi[1]

机构：[1]East China Univ Sci & Technol, Res Inst Ind Catalysis, Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

年份：2019

卷号：248

起止页码：264

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;EI(收录号：20190806524757);WOS:【SCI-EXPANDED(收录号:WOS:000463126200027)】；

基金：We would like to acknowledge the National Key Research and Development Program of China (no. 2016YFC0204300) and National Natural Science Foundation of China (no. 21477036 and 21777043).

语种：英文

外文关键词：Chlorobenzene; 1,2-Dichlorobenzene; Ceria; Tungsten; Catalytic combustion

摘要：WOx/CeO2 catalysts prepared by wet impregnation with (NH4)(6)H2W12O40 and (COOH)(2) aqueous solution were used in the catalytic combustion of chlorobenzene (CB) and 1,2-dichloro- benzene (1,2-DCB). Characterization by XRD, N-2 isothermal adsorption and desorption, Raman, XPS, H-2-TPR, O-2-TPD and NH3-TPD shows that CeO2 exists as a form of face-centered cubic fluorite structure, while WOx is identified as the forms of monoxo and dioxo monotungstate, polytungstate and nano-particle, depending on W content. W-O-Ce is formed as a result of interaction between WOx and CeO2, which increases oxygen vacancy and promotes the reducibility and acidity of WOx/CeO2 catalysts. In CB or 1,2-DCB oxidation, WOx/CeO2 catalysts with monotungstate WOx present excellent stable activity with TOF at 250 degrees C based on W-O-Ce in a range of 4.7-7.2 x 10(-4) s(-1). 90% conversion is obtained below 350 degrees C, at which chlorination is almost completely inhibited. The activity in feed containing 5% H2O or 5% CO2 is depending on their effects on the availability of surface oxygen. In situ FT-IR shows that the adsorbed CB species can be oxidized by surface lattice oxygen into phenolate, carboxylates and carbonate, while the formation of acetaldehyde on Bronsted acid sites is promoted by gas oxygen. Partial oxidation products are oxidized to COx by surface oxygen.