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Influence of the support on sulfur poisoning and regeneration of Ru catalysts probed by sulfur K-edge X-ray absorption spectroscopy

Paper ID Volume ID Publish Year Pages File Format Full-Text
54111 46997 2014 8 PDF Available
Title
Influence of the support on sulfur poisoning and regeneration of Ru catalysts probed by sulfur K-edge X-ray absorption spectroscopy
Abstract

•Sulfur is stored on the catalyst support, preventing full regeneration.•In situ XAS allows sulfur speciation under realistic conditions.•Mechanisms for poisoning and regeneration are proposed.

Catalyst supports are known not to be inert, but react with some gases, such as sulfur species. Understanding the interaction of sulfur species with the supports is necessary to design improved catalysts or optimize regeneration protocols. We investigated the oxidation state of sulfur on supported Ru catalysts and blank supports during methanation, sulfur poisoning, oxidative regeneration, and subsequent re-acitvation by sulfur K-edge X-ray absorption spectroscopy (XAS). We found that oxide (Al2O3 and ZrO2) supported Ru forms sulfides on the Ru and sulfates on the support during poisoning. Upon regeneration, sulfur is transported from the Ru to the support, and is transported back upon subsequent reducing conditions, impeding complete regeneration. On C-supported Ru, not all sulfur is removed by oxidation, making regeneration by oxidation under the tested conditions impossible.

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Keywords
Ruthenium; Sulfur; XAS; Support-effect; Poisoning; In situ spectroscopy
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Influence of the support on sulfur poisoning and regeneration of Ru catalysts probed by sulfur K-edge X-ray absorption spectroscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 229, 15 June 2014, Pages 56–63
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