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Characterization of highly dispersed cobalt sulfide catalysts by X-ray absorption fine structure and magnetic properties

Paper ID Volume ID Publish Year Pages File Format Full-Text
44604 46044 2006 9 PDF Available
Title
Characterization of highly dispersed cobalt sulfide catalysts by X-ray absorption fine structure and magnetic properties
Abstract

Zeolite-supported cobalt sulfide catalysts, CoS/NaY and CoS/USY-H, were prepared using Co(CO)3NO as a precursor. A SiO2-supported cobalt sulfide catalyst was prepared by an impregnation method for comparison. The prepared catalysts were characterized by magnetic properties and XAFS. The cobalt sulfides in CoS/NaY are paramagnetic and can be characterized as intrazeolite dinuclear species with antiferromagnetic interactions between the Co atoms, in contrast to the cobalt sulfides in CoS/SiO2, in which 95% of Co is Co9S8 and 5% is paramagnetic with a very small amount of ferromagnetic species. The structure of the cobalt sulfides in CoS/USY-H depends on the treatment after the sulfidation. Ultra-highly dispersed cobalt sulfide species initially formed during the sulfidation are transformed to highly dispersed Co9S8-like particles and eventually to ion-exchanged Co2+ cations as the evacuation temperature and duration are increased. The catalytic activity of the cobalt sulfide catalysts was measured for the hydrodesulfurization of thiophene. The results suggest a synergy generation between cobalt sulfides and surface hydroxyl groups.

Keywords
Cobalt sulfide catalysts; Hydrodesulfurization; Magnetic property; XAFS; XANES; Zeolite
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Characterization of highly dispersed cobalt sulfide catalysts by X-ray absorption fine structure and magnetic properties
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 312, 8 September 2006, Pages 125–133
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
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Full-text PDF Download
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