期刊
ACS CATALYSIS
卷 4, 期 1, 页码 187-194出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs400507m
关键词
Pd-based catalysts; heterogeneous catalysis; characterization techniques; temperature-programmed reduction; CO chemisorption; TEM; X-ray Absorption Spectroscopy; Small Angle X-ray Spectroscopy
资金
- Progetti di Ricerca di Ateneo-Compagnia di San Paolo-Linea 1A, ORTO 11RRTS project
The effect of pre-reduction in solution With chemical reagents on the catalytic performance and catalyst properties of Pd/carbon catalysts was systematically investigated with a multitechnique approach. The results are critically discussed in comparison to those recently obtained on analogous Pd/alumina catalysts. It was proved that the Pd phase on the carbon surface is characterized by a high mobility, opposite to what occurs on alumina. As a result, the Pd particles on carbon aggregate together during pre-reduction, with a consequent decrease in available metal surface. Pd particles remain aggregated also in reaction conditions; the decreased Pd dispersion negatively affects the catalyst activity in the debenzylation of 4-benzyloxyphenol.
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