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Title: Stepwise conversion of methane over supported metal-boron amorphous alloy catalysts
Authors: Lu, Y. 
Xiong, Z. 
Li, J. 
Lin, J. 
Keywords: Amorphous alloy catalyst
Higher hydrocarbon formation
Hydrogen production
Stepwise conversion of methane
Issue Date: Mar-2002
Citation: Lu, Y., Xiong, Z., Li, J., Lin, J. (2002-03). Stepwise conversion of methane over supported metal-boron amorphous alloy catalysts. Catalysis Letters 78 (1-4) : 231-237. ScholarBank@NUS Repository.
Abstract: The stepwise conversion of CH4 to higher hydrocarbons over HMCM-22 zeolite supported metal-boron amorphous alloy catalysts has been investigated, including: (1) the influence of metals (Co, Ni, Pt, Rh and Ru) of the catalysts on the reaction; (2) the promotional effect of V on the catalytic behavior of the catalysts; (3) the influence of hydrogenation pressure and CH4 decomposition temperature; and (4) the nature of carbon species. It is found that the yield of C2 + hydrocarbons is strongly dependent on the metals. Good yields of C2 + hydrocarbon are reached only on the supported NiB and CoB catalysts. The probability of C-C chain growth is increased by V promotion without seriously affecting the activities of CH4 decomposition and hydrogenation. The ease of carbon removal via hydrogenation is strongly affected by the CH4 decomposition temperature. Increasing hydrogenation temperature has a negative effect on the yield of C2 + hydrocarbons. XPS measurements show that a carbide-(like) carbon species is active and selective for hydrogenation to produce higher hydrocarbons. Its activity/selectivity is greatly reduced at high CH4 decomposition temperatures, mainly due to transition of the reactive carbidic to un-reactive graphitic form. Graphite/filamental carbons were found to be formed at high CH4 decomposition temperature.
Source Title: Catalysis Letters
ISSN: 1011372X
DOI: 10.1023/A:1014960702381
Appears in Collections:Staff Publications

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