文献类型：期刊文献

英文题名：Reduction kinetics of SrFeO3-δ/CaO?MnO nanocomposite as effective oxygen carrier for chemical looping partial oxidation of methane

作者：Wang, Xinhe[1];Yang, Liuqing[2];Ji, Xiaolin[2];Gao, Yunfei[3,4];Li, Fanxing[4];Zhang, Junshe[2];Wei, Jinjia[1,2]

机构：[1]Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Peoples R China;[2]Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Peoples R China;[3]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[4]North Carolina State Univ, Dept Chem & Biomol Engn, Raleigh, NC 27695 USA

年份：2022

卷号：16

期号：12

起止页码：1726

外文期刊名：FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING

收录：;EI(收录号：20224513058811);WOS:【SCI-EXPANDED(收录号:WOS:000878006200001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Grant No. 21978230) and Shaanxi Creative Talents Promotion Plan-Technological Innovation Team (Grant No. 2019TD-039).

语种：英文

外文关键词：chemical looping reforming; SrFeO3-delta/CaO center dot MnO nanocomposite; reduction kinetics; Avrami-Erofeyev model; pressure-dependent term

摘要：Chemical looping reforming of methane is a novel and effective approach to convert methane to syngas, in which oxygen transfer is achieved by a redox material. Although lots of efforts have been made to develop high-performance redox materials, a few studies have focused on the redox kinetics. In this work, the kinetics of SrFeO3-delta-CaO center dot MnO nanocomposite reduction by methane was investigated both on a thermo-gravimetric analyzer and in a packed-bed microreactor. During the methane reduction, combustion occurs before the partial oxidation and there exists a transition between them. The weight loss due to combustion increases, but the transition region becomes less inconspicuous as the reduction temperature increased. The weight loss associated with the partial oxidation is much larger than that with combustion. The rate of weight loss related to the partial oxidation is well fitted by the Avrami-Erofeyev equation with n = 3 (A3 model) with an activation energy of 59.8 kJ.mol(-1). The rate law for the partial oxidation includes a solid conversion term whose expression is given by the A3 model and a methane pressure-dependent term represented by a power law. The partial oxidation is half order with respect to methane pressure. The proposed rate law could well predict the reduction kinetics; thus, it may be used to design and/or analyze a chemical looping reforming reactor.