期刊
APPLIED CATALYSIS A-GENERAL
卷 364, 期 1-2, 页码 221-228出版社
ELSEVIER
DOI: 10.1016/j.apcata.2009.05.059
关键词
Gold-palladium alloy; Alcohol oxidation
资金
- Fondazione Cariplo
The oxidation of different alcohols with molecular oxygen in water has been investigated using a range of activated carbon-supported Au-Pd bimetallic catalysts. The effect of the Au-Pd ratio on the conversion and selectivity was observed and a synergistic effect is present in a large range of the Au-Pd ratio, being maximized for Au-80-Pd-20 composition instead of Au-90-Pd-10 shown in glycerol oxidation [A. Villa, C. Campione, L Prati, Catal. Lett. 115 (2007) 133]. Moreover the enhancement of conversion observed by adding a base resulted greater for gold-rich catalysts rather than for palladium-rich ones. The effect of the alcohol concentration and the metal/substrate ratio in the presence or the absence of the base was also studied revealing substantial differences in terms of both activity and selectivity. At 1 M concentration under biphasic conditions benzyl alcohol has been selectively oxidized to benzalclehyde (S90 = 98%) even in the presence of NaOH with a TOF of 18,000 h(-1) using Au-60-Pd-40/AC as the catalyst. (C) 2009 Elsevier B.V. All rights reserved.
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