文献类型：期刊文献

英文题名：Effect of MoO3 on the heat resistant performances of nickel based MCM-41 methanation catalysts

作者：Zhang, Jiaying[1];Xin, Zhong[1];Meng, Xin[1];Lv, Yuhao[1];Tao, Miao[1]

机构：[1]E China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：116

起止页码：25

外文期刊名：FUEL

收录：;EI(收录号：20133616696548);WOS:【SCI-EXPANDED(收录号:WOS:000326943400005)】；

基金：This research was financially supported by National Natural Science Funds of China (NSFC, Grant No. U1203293).

语种：英文

外文关键词：Substitute natural gas; CO methanation; Mo additives; Heat resistant performance

摘要：Several Ni-Mo based catalysts with Mo content from 1 wt% to 7 wt% were prepared by the impregnation method with MCM-41 as the support. The effect of Mo content on the activity of the catalyst was investigated for syngas methanation in a fixed-bed reactor. The addition of MoO3 could obviously improve catalytic activity of Ni/M catalyst at low temperature of 250 degrees C with the CO conversion and the CH4 selectivity from about 20%, 16% to 100%, about 80%, respectively. Ni-3%Mo/M catalyst showed the best activity with a CO conversion of 100% and a CH4 selectivity of 94% at 350 degrees C under 1.0 MPa and 12000 ml/g/h with a 3:1 molar ratio of H-2 to CO. Compared with Ni/M catalyst, Ni-Mo/M catalysts showed higher resistance to sintering and no decrease in the catalytic activity after calcination at 700 degrees C for 2 h. In the 100 h stability test under atmospheric pressure, the CO conversion and the CH4 selectivity obtained on Ni-3%Mo/M catalyst maintained at about 100% and 89%, respectively, suggesting an excellent catalytic stability of this catalyst. The catalysts were characterized by N-2 adsorption-desorption, CO chemisorptions, TEM, SEM-EDS, ICP, XRD, H-2-TPR and XPS, and the results showed that electron transfer from MoO3 to metal nickel was the main cause of activity improvement of Ni-Mo/M catalysts at low reaction temperature of 250 degrees C. The addition of MoO3 could obviously improve the heat resistant performance of Ni/M catalyst. The results of TPR, SEM-EDS and XRD showed that the addition of MoO3 could enhance the interaction between metal nickel and the support in the way of Ni-Mo alloy, which inhibited the catalyst sintering. (C) 2013 Elsevier Ltd. All rights reserved.