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Effect of citric acid addition on the hydrodesulfurization activity of MoO3/Al2O3 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42157 45912 2010 9 PDF Available
Title
Effect of citric acid addition on the hydrodesulfurization activity of MoO3/Al2O3 catalysts
Abstract

A series of MoO3/Al2O3 catalysts was prepared using citric acid (CA) as a chelating agent by a simultaneous impregnation method or by a post-treatment method. The catalyst was tested for the HDS of thiophene. The catalysts were characterized by means of LRS, XRD, Mo K-edge EXAFS and XANES, NO adsorption capacity, and surface area measurements. The catalysts were also subjected to a chemical vapor deposition (CVD) technique using Co(CO)3NO as a precursor of Co to prepare CVD-Co/MoS2 catalysts. The addition of citric acid to 8.7 wt% Mo/Al2O3 increased neither the HDS activity nor the edge dispersion of MoS2 particles. On the other hand, the addition of citric acid by the post-treatment to MoO3/Al2O3 catalysts having a higher Mo content (>20 wt% Mo) significantly enhanced the edge dispersion of MoS2 particles and thus the catalytic activity of MoS2/Al2O3 and CVD-Co/MoS2/Al2O3. The addition of citric acid by the post-treatment resulted in the formation of well-dispersed Mo species on the catalyst surface at the expense of crystalline MoO3. The Mo K-edge XAFS and XANES showed that the sulfidation degree of Mo is greatly improved by the addition of citric acid at a high Mo content regardless of the addition procedure.

Graphical abstractEffects of citric acid addition were studied on the HDS activity of MoO3/Al2O3 catalysts prepared by simultaneous impregnation and post-treatment methods. The post-treatment of MoO3/Al2O3 with citric acid greatly increased the HDS activity at a high Mo content (>20 wt% Mo) as well as the edge dispersion of MoS2 particles. The addition of citric acid also improved the sulfidation degree of Mo at a high Mo content.Figure optionsDownload full-size imageDownload high-quality image (89 K)Download as PowerPoint slide

Keywords
Catalyst preparation; Citric acid; Hydrodesulfurization; MoO3/Al2O3 catalyst; Mo K-edge XAFS; Thiophene; Post-treatment
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 374, Issues 1–2, 1 February 2010, Pages 228–236
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