文献类型：期刊文献

英文题名：Chlorinated volatile organic compound oxidation over SO42-/Fe2O3 catalysts

作者：Zhang, Zhen[1];Huang, Ju[1];Xia, Hangqi[1];Dai, Qiguang[1];Gu, Yufeng[1];Lao, Yijie[1];Wang, Xingyi[1]

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

年份：2018

卷号：360

起止页码：277

外文期刊名：JOURNAL OF CATALYSIS

收录：;EI(收录号：20180304650684);WOS:【SCI-EXPANDED(收录号:WOS:000428823600029)】；

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

语种：英文

外文关键词：Dichloromethane; Catalytic combustion; SO42-/Fe2O3; Acidity; Surface oxygen

摘要：SO42-/Fe2O3 catalysts were prepared by precipitation of FeSO4 and Fe-2(SO4)(3) and used in catalytic combustion of chlorinated volatile organic compounds (CVOCs). Characterization by XRD, TEM, Raman, FT-IR, XPS, H-2 TPR, and NH3 TPD identifies SO42-/Fe2O3 catalysts as the form of hematite alpha-Fe2O3. Residual SO42- species as chelating or bridged bidentate complexes with Fe3+ ions provide a large amount of acid. SO42-/Fe2O3 catalysts present considerable activity for dichloromethane combustion, which is dependent on both super-strong acidity and surface oxygen. Turnover frequency (based on the mole number of transformed dichloromethane per second per mole super-strong acid) obtained on SO42-/Fe2O3-II reaches 0.0036 s(-1) at 200 degrees C at GHSV of 30,000 h(-1). High stability in dry or wet feed is maintained at 330 degrees C for at least 50 h. Moreover, other CVOCs such as 1,2-dichloroethane, trichloroethylene, chlorobenzene, and 1,2-dichlorobenzene can be oxidized effectively over SO42-/Fe2O3-II. In situ FTIR indicates that CVOCs adsorb onto SO42-/Fe2O3 catalysts mainly through the formation of organic sulfates. Dichloromethane and 1,2-dichloroethane have much higher reactivity toward the SO42- complex than chlorobenzene, and different reaction pathways were related to different types of acid sites. (C) 2017 Elsevier Inc. All rights reserved.