NDLI: Stepwise Conversion of Methane over Supported Metal-Boron Amorphous Alloy Catalysts

Content Provider	Springer Nature Link
Author	Lu, Yong Xiong, Zhitao Li, Jitao Lin, Jianyi
Copyright Year	2002
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 C+ 2 hydrocarbons is strongly dependent on the metals. Good yields of C+ 2 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 C+ 2 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 unreactive graphitic form. Graphite/filamental carbons were found to be formed at high CH4 decomposition temperature.
Starting Page	231
Ending Page	237
Page Count	7
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	78
Issue Number	1-4
e-ISSN	1572879X
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2002-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Pharmacy
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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