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Type: Artigo de periódico
Title: Catalytic decomposition of hydrazine on tungsten carbide: the influence of adsorbed oxygen
Author: Santos, JBO
Valenca, GP
Rodrigues, JAJ
Abstract: Passivated and nonpassivated tungsten carbide (WC) powders were prepared by a temperature-programmed reaction and used as catalysts in the hydrazine decomposition reaction. All catalysts were active at 313 K. The only products of reaction were nitrogen and ammonia, suggesting that the reaction route and the rate-determining step were not modified by adsorbed oxygen. Surface oxygen atoms reacted with hydrazine, resulting in a larger decrease in the rate of reaction for the passivated solids. Excess carbon on the surface of the carbide inhibited the decomposition of hydrazine and resulted in a decrease of ca. 48% in the specific surface area of the tungsten carbide. The excess carbon may be removed in flowing hydrogen at 1000 K. When compared to commercial Ir catalyst (Shell 405), WC is less active in the hydrazine decomposition reaction. (C) 2002 Elsevier Science (USA).
Subject: hydrazine decomposition
tungsten carbide
temperature-programmed reaction
WC catalyst
passivated WC powders
nonpassivated WC powders
Country: EUA
Editor: Academic Press Inc Elsevier Science
Citation: Journal Of Catalysis. Academic Press Inc Elsevier Science, v. 210, n. 1, n. 1, n. 6, 2002.
Rights: fechado
Identifier DOI: 10.1006/jcat.2002.3634
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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