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- W2077710885 abstract "High surface area WC and β-W2C powders (30–100 m2g−1) were prepared by direct isothermal carburization of WO3 and W2N in CH4-H2 mixtures. After surface cleaning with H2, their surfaces are equilibrated with bulk stoichiometric carbides and free of polymeric carbon; they chemisorb 0.2–0.4 monolayers of CO and H. These carbides catalyze neopentane hydrogenolysis with high selectivity. Chemisorbed oxygen also inhibits hydrogenolysis rates and introduces surface sites for neopentane isomerization, a reaction that occurs only on Pt, Ir, and Au metals. Chemisorbed oxygen also inhibits hydrogenolysis of n-hexane and n-heptane on tungsten carbides and introduces surface sites that lead to high isomerization selectivity (70–99%). Kinetic and isotopic tracer studies of n-heptane, 3,3 dimethylpentane, methylcyclohexane, propylene, and methanol reactions show that dehydrogenation reactions and methyl-shifts of unsaturated intermediates occur on oxygen-modified WC powders. Carbidic sites (WCx) catalyze C-H activation reactions; chemisorbed oxygen titrates such WCx sites and introduces Bronsted acid surface sites (WOx). Thus, these materials catalyze both dehydrogenation and carbenium-ion reactions, reflecting the bifunctional nature of oxygen-modified transition metal carbide surfaces." @default.
- W2077710885 created "2016-06-24" @default.
- W2077710885 creator A5028587987 @default.
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- W2077710885 date "1992-06-01" @default.
- W2077710885 modified "2023-10-18" @default.
- W2077710885 title "Synthesis, characterization, and catalytic properties of clean and oxygen-modified tungsten carbides" @default.
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- W2077710885 doi "https://doi.org/10.1016/0920-5861(92)80181-l" @default.
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