文献类型：期刊文献

英文题名：The oxidation of chlorinated organic compounds over W-modified Pt/CeO2 catalysts

作者：Gu, Yufeng[1];Shao, Shijie[1];Sun, Wei[1];Xia, Hangqi[1];Gao, Xiaohui[1];Dai, Qiguang[1];Zhan, Wangcheng[1];Wang, Xingyi[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2019

卷号：380

起止页码：375

外文期刊名：JOURNAL OF CATALYSIS

收录：;EI(收录号：20194507633795);WOS:【SCI-EXPANDED(收录号:WOS:000501647600035)】；

基金：We acknowledge the support of the National Key Research and Development Program of China (No. 2016YFC0204300) and the National Natural Science Foundation of China (Nos. 21477036 and 21777043).

语种：英文

外文关键词：Chlorinated aromatics; Ceria; Tungsten; Platinum; Catalytic combustion

摘要：Pt-xW/CeO2 catalysts, prepared by co-impregnation with aqueous solutions of (NH4)(6)-H2W12O40 and H2PtCl6, were applied in the catalytic oxidation of benzene (B), chlorobenzene (CB), and 1,2-dichlorobenzene (1,2-DCB). Characterization by various methods identified CeO2 as cubic fluorite, and WOx in the form of monoxo monotungstate. The interaction of WO, with CeO2 and Pt species led to the formations of W-O-Ce and Pt-O-W, of which W-O-Ce increased oxygen vacancies and acidity, while Pt-O-W promoted the reducibility and availability of surface oxygen. In the oxidation of CB and l,2-DCB, Pt-xW/CeO2 catalysts presented high activity and TOF at 225 degrees C of 1.8-18.6 and 1.4-7.3 x 10(-4)s(-1), respectively. During 50-h stability tests, Pt-O-W and W-O-Ce structures remained unchanged, even in the presence of water. The availability of surface oxygen was responsible for stable high activity. At 90% conversion, almost no chlorination products were detected. In situ FT-IR showed that CB reacted with hydroxyl groups to produce phenolate, which was sequentially converted by lattice oxygen into acetaldehyde and carboxylates, while surface oxygen oxidized the partial oxidation products to CO2. (C) 2019 Elsevier Inc. All rights reserved.