期刊
CATALYSIS TODAY
卷 154, 期 1-2, 页码 7-12出版社
ELSEVIER
DOI: 10.1016/j.cattod.2010.03.050
关键词
HCOOH decomposition; Hydrogen; Palladium; Gold; Catalytic transfer hydrogenation; Water-gas shift reaction
资金
- Science Foundation Ireland [06/CP/E007]
Vapour phase decomposition of formic acid has been studied systematically over a range of catalysts: 1.0 and 10 wt.% Pd/C, 0.8 wt.% Au/C and 1.0 wt.% Au/TiO2. The mean metal particle size of these materials was estimated by HRTEM and turnover frequencies were calculated using these data. The Au/C catalyst was the least active and the Pd/C catalysts were the most active for the formic acid decomposition reaction. At about 400 K, these Pd catalysts gave up to 0.04 moles of H-2 per minute per gram of Pd, with a selectivity of 95-99%. The H-2 selectivity for these catalysts was found to be only weakly dependent on the reaction temperature and the formic acid conversion. The Au/TiO2 catalyst showed only a moderate selectivity to H-2 formation (<70%). The selectivity of this catalyst was improved considerably by the introduction of water vapour. This improvement derived from the high activity of the catalyst for the water-gas shift reaction. (C) 2010 Elsevier B.V. All rights reserved.
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