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Pd/K/Co-oxide catalyst for water gas shift

Paper ID Volume ID Publish Year Pages File Format Full-Text
39417 45822 2015 8 PDF Available
Title
Pd/K/Co-oxide catalyst for water gas shift
Abstract

•Pd/K/Co3O4 catalyst shows high activity for WGS reaction.•EXAFS analyses showed the formation of Pd–Co alloy on Pd/K/Co3O4.•Pd and Co showed higher electron density by electron donation from K.•Reaction proceeds via carbonyl and then formate intermediates on Pd/K/Co3O4.•Reaction intermediate, mechanism, and the structure of catalyst was discussed for Pd/K/Co3O4.

Various Co3O4 catalysts were investigated for the water gas shift (WGS) reaction for hydrogen production. Although the catalyst supporting only palladium (Pd/Co3O4) showed low catalytic activity and higher selectivity to methanation, Pd/K/Co3O4 catalyst, with loading of potassium exceeding 0.78 wt%, showed high catalytic activity for the WGS reaction. Catalysts on which Pd and K exist closely showed high activity, as confirmed using various preparation methods. Results of XPS measurements for Pd/K/Co3O4 revealed that supported potassium donated electrons to Pd and Co. The state of CO adsorption species was affected by the potassium loading, resulting in high catalytic activity for the Pd/K/Co3O4 catalyst. These effects gave the Pd/K/Co3O4 catalyst high catalytic activity for the WGS reaction. That reaction over Pd/K/Co3O4 proceeds via surface cobalt carbonyl and then formate intermediates, as revealed by the TG and isotope exchange measurements using H218O and DRIFT.

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Keywords
Water gas shift; Cobalt catalyst; Potassium addition; In situ IR
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Pd/K/Co-oxide catalyst for water gas shift
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 489, January 2015, Pages 247–254
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
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