文献类型：期刊文献

英文题名：NixAl1O2-δ mesoporous catalysts for dry reforming of methane: The special role of NiAl2O4 spinel phase and its reaction mechanism

作者：Zhang, Shuangshuang[1];Ying, Ming[1];Yu, Jun[2];Zhan, Wangcheng[1];Wang, Li[1];Guo, Yun[1];Guo, Yanglong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Shanghai Inst Technol, Res Inst Appl Catalysis, Sch Chem & Environm Engn, Shanghai 201418, Peoples R China

年份：2021

卷号：291

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY

收录：;EI(收录号：20211010037894);WOS:【SCI-EXPANDED(收录号:WOS:000651114800005)】；

基金：This work was supported by the National Key Research and Development Program of China (2016YFC0204300), the National Natural Science Foundation of China (21808142), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Dry reforming of methane; NixAl1O2-delta catalysts; NiAl2O4 spinel phase; Coke resistance

摘要：The structure evolution of surface NiAl2O4 spinel phase in NixAl1O2-delta mesoporous catalysts, synthesized by the citric acid sol-gel method, was systematically investigated. Small-size Ni nanoparticles, obtained by partial reduction from NiAl2O4 spinel in NixAl1O2-delta catalysts with low Ni contents at high temperature, can effectively inhibit the carbon formation from kinetics, while the irreducible NiAl2O4 counterpart can participate in elimination of carbon deposition. The constructed structure of Ni-0-NiAl2O4 interfaces, produced by exsolution of Ni from NiAl2O4 spinel, is responsible for its high long-term stability and excellent resistance to coking and sintering for dry reforming of methane (DRM) reaction. The structure sensitivity and kinetic compensation effect of CH4 dissociation on Ni-0 active sites are observed. DRM reaction proceeds via a Langmuir-Hinshelwood mechanism accompanied by an additional redox mechanism. It is noteworthy that the active oxygen species generated by filling the oxygen vacancies of NiAl2O4 spinel by CO2 provide another rapid redox route to eliminate carbon species.