期刊
JOURNAL OF CO2 UTILIZATION
卷 18, 期 -, 页码 345-352出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2016.12.014
关键词
Dry reforming of methane; Nickel-cobalt alloy; Phyllosilicates; Carbon-resistance
资金
- National University of Singapore under FRC Project [WBS R-279-000-407-112, ETRP 1501 103, WBS R-279-000-491-279]
- Research Excellence and Technological Enterprise (CREATE) program under NRF Project [WBS R-706-001-101-281]
- China Scholarship Council (CSC)
This paper describes synthesis and characterization of Ni and Ni-Co alloy supported over SiO2 derived from phyllosilicates. A series of 10 wt% Ni- Co phyllosilicate supported over SiO2 with different Ni/Co ratio is successfully prepared by hydrothermal method where urea is used to release ammonia gradually providing a basic environment. TPR results show that adding of Co enhances the metal-support interaction. After H-2 reduction at high temperature, small and uniform Ni- Co alloy particles are well supported over silica. These catalysts are tested for dry reforming of methane (DRM) at 750 degrees C. The catalytic performance is highly affected by Ni/Co ratio: 10Ni and 7Ni3Co show high and stable activity for 100 h, whereas 5Ni5Co, 3Ni7Co and 10Co exhibit severe deactivation due to oxidation of metal sites. A harsher test has shown that adding of Co with a proper amount indeed can help to suppress metal sintering and carbon formation. (C) 2017 Elsevier Ltd. All rights reserved.
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