文献类型：期刊文献

英文题名：Mn and Mg dual promoters modified Ni/α-Al2O3 catalysts for high temperature syngas methanation

作者：Zhou, Jingyu[1];Ma, Hongfang[1];Jin, Fangyu[2];Zhang, Haitao[1];Ying, Weiyong[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, Minist Educ, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Yanzhou Coal Min Yulin Energy & Chem Co Ltd, Yulin 719000, Shanxi, Peoples R China

年份：2018

卷号：172

起止页码：225

外文期刊名：FUEL PROCESSING TECHNOLOGY

收录：;EI(收录号：20181304955277);WOS:【SCI-EXPANDED(收录号:WOS:000425205300026)】；

基金：This work is financially supported by the National Science and Technology Supporting Plan (No. 2012AA050102) and the Fundamental Research Funds for the Central Universities (No. 22201717013).

语种：英文

外文关键词：Manganese; Magnesium; alpha-Al2O3; Particle size; Agglomeration

摘要：Mn and Mg doped Ni/alpha-Al2O3 catalysts were prepared by impregnation method for high temperature syngas methanation. The catalysts were characterized by N-2 adsorption-desorption, XRD, HRTEM, H-2-TPR, CO-TPD, CO2-TPD, CO pulse chemisorption and XPS. Compared to single promoter doped catalysts, dual promoters doped catalysts exhibited better high temperature activity. In particular, an optimal catalyst with Mn, Mg content of 2 wt% (2Mn2Mg) achieved almost 100% CO conversion and 97.5% CH4 selectivity at 500 degrees C, 2.0 MPa, and a WHSV of 12,000 mL.g(-1)h(-1), and showed good stability in stability test. Mn and Mg species could help to form a moderated interaction between NiO with support in co-impregnation process, which inhibited Ni agglomeration in high temperature, improved the Ni dispersion, and enhanced the CO/CO2 adsorption capacity. Meanwhile, the Ni electron cloud density increased by electron transfer from promoters, which facilitated the dissociation of CO on the catalyst surfaces. In addition, the impregnation sequence and promoters loading was also investigated.