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Investigation of highly active Fe-Al-Cu catalysts for water-gas shift reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
42621 45934 2008 8 PDF Available
Title
Investigation of highly active Fe-Al-Cu catalysts for water-gas shift reaction
Abstract

The Fe-Al-Cu formulation was demonstrated to be a highly promising Cr-free WGS catalyst in our previous work. Cu contributes significantly to the activity enhancement as a structural promoter. The extent of Cu’s promotional effect is largely dependent on how Cu is doped into the iron oxide structure during catalyst preparation. In this paper, effects of preparation methods on catalyst activity were investigated. A sol–gel technique was introduced for catalyst synthesis. Catalysts synthesized by a sol–gel technique were compared to those prepared by a 1-step precipitation or a 2-step precipitation–impregnation techniques. Steady state reaction data showed that sol–gel Fe-Al-Cu exhibited a much higher activity than Fe-Al-Cu catalysts prepared with the other two methods and surpassed the commercial catalyst over a wide reaction temperature range. Characterization results indicated that Cu was uniformly distributed in the iron oxide structure for the sol–gel catalysts. A mixture of iron oxide crystal phases were observed for sol–gel Fe-Al-Cu. Sol–gel preparation created a large amount of oxygen vacancies in the structure, which facilitates the redox cycle during the WGS reaction.

Graphical abstractCatalysts prepared by a modified sol–gel techniques have shown very different activity and very different pore structure from the catalysts prepared by precipitation or precipitation/impregnation techniques. Figure shows adsorption–desorption isotherms of N2 at 77 K for Fe-Al-Cu catalysts. Filled symbols represent adsorption while open symbols denote desorption.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Water-gas shift; Fe-Al-Cu; Cr-free; Sol–gel; α-Fe2O3; γ-Fe2O3; Hematite; Maghemite; Magnetite
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Investigation of highly active Fe-Al-Cu catalysts for water-gas shift reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 351, Issue 1, 15 December 2008, Pages 1–8
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