期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 39, 期 19, 页码 10141-10153出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.04.172
关键词
CH4-CO2 reforming; Char; Ni; Cr; Nickel carbide
资金
- National Natural Science Foundation of China [21106113]
- China Scholarship Council [201206975013]
- Shaanxi Province Science and Technology Research and Development of China [2010K01-084]
- Natural Science Foundation of Shaanxi Province of China [2011JY006]
- Xi'an Engineering Laboratory Project
- School of Energy Resources
- Department of Chemical and Petroleum Engineering at University of Wyoming
The objective of the study is to investigate the catalytic performance of Cr-promoted Ni/char in CO2 reforming of CH4 at 850 degrees C. The char obtained from the pyrolysis of a long-flame coal at 1000 degrees C was used as the support. The catalysts were prepared by incipient wetness impregnation methods with different metal precursor doping sequence. The characterization of the composite catalysts was evaluated by XRD, XPS, SEM-EDS, TEM, H-2-TPR, CO2-TPD, CH4-TPSR, and CO2-TPO. The results indicate that the catalyst prepared by co-impregnation of Ni and Cr possess higher activity than those by sequential impregnation. The optimal loading of Cr on 5 wt% Ni/char is 7.8 wt parts per thousand. Moreover, the molar feed ratio of CH4/CO2 has a considerable effect on both the stability and the activity of Cr-Ni/char. The main effect of Cr is the great enhance of the adsorption to CO2. It is interesting that the conversions of CH4 and CO2 over Cr-promoted Ni/char and Ni/char decrease initially, following by a steady rise as the reaction proceeds with time-on-stream (TOS). In addition, cyclic tests were conducted and no distinct deterioration in the catalytic performance of the catalysts was observed. On the basis of the obtained results, nickel carbide was speculated to be the active species which was formed during the CO2 reforming of CH4 reaction. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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