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Mesoporous silica–alumina modified by acid leaching as support of Pt catalysts in HDS of model compounds

Paper ID Volume ID Publish Year Pages File Format Full-Text
47028 46456 2010 9 PDF Available
Title
Mesoporous silica–alumina modified by acid leaching as support of Pt catalysts in HDS of model compounds
Abstract

The potential of mesoporous silica–alumina (MSA) modified by acid leaching as alternative support for Pt catalysts was studied in hydrodesulfurization (HDS) of thiophene and benzothiophene. The supports were characterized by N2 adsorption, XRD, 27AL MAS NMR, electron microscopy (SEM, HRTEM) and by activities in cyclohexene isomerization and cumene cracking. The composition of the catalysts and Pt dispersion were determined by ICP and H2 or CO sorption, respectively. Progressive leaching of the parent MSA from 50% Al2O3 to 11% Al2O3 content led to increase of the BET surface area and exposition of strong acidity. This positively affected the activities of the reduced Pt catalysts in thiophene HDS. Deposition of 1.5 wt.% Pt on MSA (11% Al2O3) by using Pt(NH3)4(OH)2 as precursor gave the best catalyst, several times more active in thiophene HDS than the weight equivalents of sulfided CoMo/Al2O3 or reduced Pt/HY zeolite. In benzothiophene reaction, its activity was slightly above that of CoMo/Al2O3 and about twofold compared to Pt/HY.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Leaching of non-acidic Al2O3 from mesoporous silica–alumina carrier (50% Al2O3) by HNO3 increased the BET area, proportion of AlTET and exposed strong acidity. ▶ This improved the HDS activity of Pt catalysts prepared from such modified carriers. ▶ The best catalyst with 1.5% Pt was much more active in HDS of thiophene and benzothiophene than Pt/HY and industrial CoMo/Al2O3.

Keywords
Hydrodesulfurization; Mesoporous silica–alumina; Acid leaching; Platinum
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 100, Issues 3–4, 20 October 2010, Pages 463–471
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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
Online Support
Any Questions? feel free to contact us