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Preparation of Co–Mo/B2O3/Al2O3 catalysts for hydrodesulfurization: Effect of citric acid addition

Paper ID Volume ID Publish Year Pages File Format Full-Text
42961 45949 2009 7 PDF Available
Title
Preparation of Co–Mo/B2O3/Al2O3 catalysts for hydrodesulfurization: Effect of citric acid addition
Abstract

The effect of citric acid (CA) addition was studied on the HDS of thiophene over Co–Mo/(B)/Al2O3 catalysts. The catalysts were characterized by means of LRS, Mo K-edge EXAFS, NO adsorption capacity measurements, and UV–vis spectra. The catalysts were subjected to a chemical vapor deposition (CVD) technique using Co(CO)3NO as a precursor of Co in order to get deeper insights into the effect of citric acid addition. It was shown that the HDS activity was enhanced by the citric acid addition up to the CA/Mo mole ratio of around 1 and leveled off with further addition. The amount of Co anchored by the CVD was increased by the addition of citric acid, suggesting an increase in the dispersion of MoS2 particles on the catalyst by the simultaneous presence of Co, Mo and citric acid, in conformity with the increase in the NO adsorption capacity. In contrast to Co–Mo catalysts, the edge dispersion of MoS2 particles in Mo/B/Al2O3 was not affected by the addition of citric acid. The LRS, UV–vis spectra and Mo K-edge EXAFS showed that Co–CA and Mo–CA surface complexes are formed by the addition of citric acid. The Co–CA surface complex is more preferentially formed on CoMo/Al than on CoMo/B/Al, in agreement with a greater promoting effect of citric acid at a lower CA/Mo mole ratio for CoMo/Al than for CoMo/B/Al.

Graphical abstractThis research studied the effect of citric acid (CA) addition on the hydrodesulfurization (HDS) of thiophene over Co–Mo/(B)/Al2O3 catalysts prepared by a simultaneous impregnation method. The HDS activity enhanced up to the CA/Mo mole ratio of 1 and leveled off by the addition of more CA. The dispersion of MoS2 particles is increased by the simultaneous presence of Mo, Co, and CA.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Catalyst preparation; Citric acid; Hydrodesulfurization; Co–Mo sulfide catalysts; EXAFS; LRS; Chelating agent; Boria-alumina
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Preparation of Co–Mo/B2O3/Al2O3 catalysts for hydrodesulfurization: Effect of citric acid addition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 360, Issue 2, 1 June 2009, Pages 130–136
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