期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 39, 期 36, 页码 21015-21023出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.10.086
关键词
Carbon dioxide; Methane; Reforming; Ni-Co/MgO catalyst; Reduction time
资金
- Program for Changjiang Scholars
- National Natural Science Foundation of China [21406155]
- Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province
- Qualified Personnel Foundation of Taiyuan University of Technology [tyutrc-201301a]
- Youth Team Foundation of Taiyuan University of Technology [2013T087]
- [GDW201400042]
Reducing catalysts with hydrogen is an important process for carbon dioxide reforming methane since metallic active sites are exposed and dispersed during the reduction process. In this work, Ni-Co/MgO catalysts were prepared for syngas production by using a multiple-impregnation method with a carbon dioxide reforming methane reaction. Activity evaluation showed that catalysts that reduced for 1 h exhibited superior catalytic activity with methane and carbon dioxide conversion at 92% and 97%, respectively, and the syngas ratio close to unity (0.98). The high activity is ascribed to the better metal dispersion (10.5%) and smaller active metal particle size (10 nm). Raman spectra analysis indicated that catalysts that reduced for a longer time possessed larger active metal particle size, and were more susceptible to the formation of graphite-like carbon deposits, which were difficult to be removed by the active oxygen species derived from carbon dioxide dissociation. Copyright (c) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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