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Ruthenium sulfide clusters in acidic zeolites: In situ XAS characterization during sulfidation and reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
43919 45995 2007 8 PDF Available
Title
Ruthenium sulfide clusters in acidic zeolites: In situ XAS characterization during sulfidation and reaction
Abstract

In situ XAS at the Ru K edge was used to study the reductive sulfidation (15% H2S/H2) of Ru(NH3)63+ supported on HYd zeolite, and the evolution of the sulfided sample under working conditions (lower H2S partial pressure, addition of toluene to the feed). Sulfidation starts at room temperature and is complete at 373 K. At that temperature, the sample is fully sulfided (5.9 S neighbours per Ru). Above 423 K a partial surface reduction (4.3 S neighbours per Ru), and the formation of metallic ruthenium (3.3 Ru neighbours per Ru) are observed. The evolution under working conditions shows that the local structure is not significantly modified when the H2S partial pressure is decreased and especially that it does not lead to an increased reduction. Upon addition of toluene the intensity of the Ru–Ru peak in the FT EXAFS spectra is modified, whereas the Ru–S peak remains unchanged. This is indicative of the chemisorption of toluene on the metallic sites and points out the prominent role of these sites for aromatics hydrogenation.

Keywords
EXAFS; XANES; RuS2; HY zeolite; Toluene hydrogenation; Operando characterization
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Ruthenium sulfide clusters in acidic zeolites: In situ XAS characterization during sulfidation and reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 322, 16 April 2007, Pages 98–105
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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