کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
62091 | 47620 | 2010 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Mesoporous silica as supports for Pd-catalyzed H2O2 direct synthesis: Effect of the textural properties of the support on the activity and selectivity Mesoporous silica as supports for Pd-catalyzed H2O2 direct synthesis: Effect of the textural properties of the support on the activity and selectivity](/preview/png/62091.png)
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 O2 can chemisorb without dissociation.
SBA-15 allows preparing palladium catalysts with enhanced productivity and selectivity in the direct synthesis of hydrogen peroxide by imparting Pd particles the proper size and distribution.Figure optionsDownload high-quality image (114 K)Download as PowerPoint slide
Journal: Journal of Catalysis - Volume 273, Issue 2, 28 July 2010, Pages 266–273