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In situ XAFS study of the sulfidation of Co–Mo/B2O3/Al2O3 hydrodesulfurization catalysts prepared by using citric acid as a chelating agent

Paper ID Volume ID Publish Year Pages File Format Full-Text
42245 45916 2010 8 PDF Available
Title
In situ XAFS study of the sulfidation of Co–Mo/B2O3/Al2O3 hydrodesulfurization catalysts prepared by using citric acid as a chelating agent
Abstract

The chemical states of the active species, Co and Mo, of the Co–Mo/B2O3/Al2O3 catalysts were investigated during the sulfidation treatment by means of an in situ X-ray absorption fine structure technique. It was clearly shown by Co K-edge X-ray absorption near edge structure (XANES) spectra that the sulfidation of Co is strongly suppressed by the addition of citric acid (CA) to the catalyst. Mo K-edge XANES spectra revealed that the sulfidation of Mo is also inhibited by the addition of CA. The sulfidation behavior of Mo depended on the catalyst preparation method. With the Co–Mo catalyst prepared by the post-treatment of a calcined Co–Mo catalyst with CA, Mo was sulfided prior to or in parallel with the sulfidation of Co, resulting in a higher activity of the catalyst for the hydrodesulfurization of thiophene than that of a catalyst prepared by simultaneous impregnation of Co, Mo, and CA.

Graphical abstractIn situ XAFS study showed that with the Co–Mo catalyst prepared by the post-treatment of a calcined Co–Mo catalyst with citric acid, Mo was sulfided prior to or in parallel with the sulfidation of Co, resulting in a higher activity of the catalyst for the hydrodesulfurization of thiophene than that of a catalyst prepared by simultaneous impregnation of Co, Mo, and citric acid.Figure optionsDownload full-size imageDownload high-quality image (203 K)Download as PowerPoint slide

Keywords
XAFS; Hydrodesulfurization; Co–Mo sulfide catalyst; Citric acid; Chelating agent; Catalyst preparation
First Page Preview
In situ XAFS study of the sulfidation of Co–Mo/B2O3/Al2O3 hydrodesulfurization catalysts prepared by using citric acid as a chelating agent
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 373, Issues 1–2, 31 January 2010, Pages 214–221
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis