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Catalyt properties of tungsten oxycarbide and carbide in hydrocarbon conversion
Author(s) -
Gao Zi,
Qin DaiYi
Publication year - 1990
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19900080304
Subject(s) - chemistry , hydrogenolysis , catalysis , cyclohexane , dehydrogenation , tungsten , tungsten carbide , tungstic acid , hydrocarbon , isomerization , crystal structure , carbide , heptane , inorganic chemistry , photochemistry , organic chemistry
Tungsten oxycarbide with specific surface area ⋍ 24 m 2 /g was prepared from white tungstic acid by reduction and carburization with CO and H 2 . XRD and EXAFS measurements confirmed that the WOC obtained has a simple hexagonal structure isotypic with α‐WC and the oxygen is inserted into the trigonal prismatic interstices of the crystal lattice. The reactions of n ‐hexane, n ‐heptane and cyclohexane on WOC were studied and compared with WC prepared by direct synthesis at high temperature. WOC and WC are active for the hydrogenolysis, isomerization and dehydrocyclization of alkanes and dehydrogenation of cyclohexane and their catalytic properties are in many ways similar to Pt catalysts. Oxygen insertion inhibits the catalytic activities of tungsten carbide for hydrocarbon conversion reactions probably due to electronic effect.