文献类型：期刊文献

英文题名：Structure Evolution of Co-CoOx Interface for Higher Alcohol Synthesis from Syngas over Co/CeO2 Catalysts

作者：Chen, Tian-yuan[1];Su, Junjie[1];Zhang, Zhengpai[1];Cao, Chenxi[1];Wang, Xu[2];Si, Rui[2];Liu, Xianglin;Shi, Bianfang[1];Xu, Jing[1];Han, Yi-Fan[1,3]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China;[3]Zhengzhou Univ, Sch Chem Engn & Energy, Res Ctr Heterogeneous Catalysis & Engn Sci, Zhengzhou 450001, Henan, Peoples R China

年份：2018

卷号：8

期号：9

起止页码：8606

外文期刊名：ACS CATALYSIS

收录：;EI(收录号：20183505757101);WOS:【SCI-EXPANDED(收录号:WOS:000444364800092)】；

基金：The authors are grateful to the support from the National Key R&D Program of China (2018YFB0604501), National Science Foundation (21576084, 91534127, and U1463205), Fundamental Research Funds for the Central Universities (222201718002), the National Key R&D Program of China (2018YFB0604500), and Innovation Scientists and Technicians Troop Construction Projects of Henan Province and Chinese Education Ministry 111 project (B08021). We sincerely thank the staff from the BL14W1 beamline, Shanghai Synchrotron Radiation Facility (SSRF), for their generous help in XAS experiments.

语种：英文

外文关键词：higher alcohol synthesis; in situ; Co-CoOx pairs; structure evolution; metal-support interactions; interface; syngas

摘要：CeO2 nanorods supported Co-CoOx catalysts showed high selectivity for higher alcohol synthesis (HAS) from syngas. The selectivity has found to increase with lowering the Co loadings, and the value over Co-1/CeO2 (19.86%) is twice higher than that over Co-5/CeO2 (8.67%). The active sites at the interfaces between Co-0 and CoOx, or to say, Co-Co-x pairs, have evidenced to be responsible for HAS. The strong metal-support interactions between Co and CeO2 retard the reduction of CoOx and stabilize the intermediates such as CO-Co delta+. Likely, CO favors dissociating on the metallic Co surface to form CHx species, while CO is associatively activated on Co delta+ sites. Moreover, the structure evolution of the Co-CoOx interface was revealed during calcination, reduction, and reaction using in situ X-ray diffraction (XRD), in situ Raman spectroscopy, X-ray absorption spectroscopy (XAS), and in situ diffuse reflectance infrared fourier transform spectroscopy (CO-DRIFTS). The structure-performance relationship of HAS over Co/CeO2 was proposed.