期刊
JOURNAL OF CATALYSIS
卷 273, 期 2, 页码 266-273出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.06.003
关键词
Hydrogen peroxide direct synthesis; H2O2; Palladium; Silica; MCM-41; SBA-15
资金
- MIUR (Rome)
Pd-based catalysts supported on commercial silica, SBA-15 and MCM-41 were tested for the direct synthesis of hydrogen peroxide under very mild conditions of temperature and pressure and outside the explosion range. Silica and SBA-15 impart good catalytic activity, selectivity, mechanical stability and reusability. Best results were obtained with SBA-15 samples that show higher productivity than plain silica. Further catalytic tests were performed at higher pressures, still outside the explosive region. Even under these reaction conditions, the SBA-15 catalysts are the most selective. Characterization data indicate a close correlation between the textural properties of the support and the catalytic activity of the examined samples. The mean Pd particle size observed on the SBA-15 is a good compromise between a high metal dispersion necessary for high catalytic activity and the presence of less energetic sites, on which O-2 can chemisorb without dissociation. (C) 2010 Elsevier Inc. All rights reserved.
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