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Post-synthesis alumination of MCM-41: Effect of the acidity on the HDS activity of supported Pd catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42016 45907 2010 6 PDF Available
Title
Post-synthesis alumination of MCM-41: Effect of the acidity on the HDS activity of supported Pd catalysts
Abstract

Siliceous MCM-41 with different amount of alumina, from 0.25 up to 4.0 wt%, were prepared by impregnation of the MCM-41 with aqueous solution of Al(NO)3·9H2O. The modified mesoporous silicas were then used as supports for Pd catalysts prepared by wet-impregnation from PdCl2 precursor. Supports and corresponding Pd catalysts were characterized by XRD, XPS and NH3-TPD. The catalytic behavior was tested in the hydrodesulfurization (HDS) reaction of thiophene. An increase of the hydrodesulfurization activity with increasing alumina amount up to 0.5 wt% was observed. On the basis of the acidity change of the support and the structural modification underwent by the deposited palladium, the improved catalytic behavior was associated to the increased acidity of the supports and also to its effect on the palladium dispersion. A bi-functional mechanism, implying that metallic palladium activates the hydrogen and the thiophene molecules are adsorbed on the acid sites of the support, could be operative. However, the increased acidity was also responsible for the larger catalyst deactivation which limited the beneficial effect up to a certain amount of alumina content.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (73 K)Download as PowerPoint slideResearch highlights▶ Post-alumination of siliceous MCM-41 promotes thiophene HDS activity of supported Pd. ▶ The addition of Al 3+ to MCM-41 increases the acidity of the Pd catalysts. ▶ Bi-functional mechanism for the activation of thiophene over Pd catalysts. ▶ Direct correlation between catalyst deactivation and catalyst acidity.

Keywords
Thiophene HDS; Pd/MCM-41; Alumina modification
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Post-synthesis alumination of MCM-41: Effect of the acidity on the HDS activity of supported Pd catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 383, Issues 1–2, 31 July 2010, Pages 211–216
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us