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La1−xKxFe0.7Ni0.3O3 catalyst for ethanol steam reforming—The effect of K-doping

Paper ID Volume ID Publish Year Pages File Format Full-Text
53506 46972 2016 8 PDF Available
Title
La1−xKxFe0.7Ni0.3O3 catalyst for ethanol steam reforming—The effect of K-doping
Abstract

•K-doped Ni/LaFeO3 catalysts were obtained.•K-doping improved the ability to prevent coking of the catalyst markedly.•The doping of potassium can restrain the sintering of nickel.

Coking is the critical problem for catalysts for steam reforming of ethanol (SRE). Several techniques have been reported for improving the ability to prevent coking of catalysts, such as adding alkaline to balance the acidic sites on the support, using support which can generate oxygen vacancies and using bimetallic catalysts. In this work, we try to improve the ability to prevent coking of this kind of catalyst by doping additives to modify the active component, which has not been attracted attention for SRE catalysts yet. La1−xKxFe0.7Ni0.3O3 (x = 0, 0.05, 0.1) with perovskite structure was prepared by citric acid complexation method, and after reduction K-doped Ni/LaFeO3 catalysts were obtained. The catalytic performance including the ability to prevent coking and sintering over the catalysts were investigated. The catalysts were characterized by using X-ray diffraction, transmission electron microscopy, thermal analysis techniques and X-ray photoelectron spectroscopy analysis. The results indicate that the K-doped catalysts are very active, highly selective to hydrogen, as well very stable for SRE reaction. The doping of potassium can also restrain the sintering of nickel. The doping of K improved the ability to prevent coking of the catalyst markedly, which is attributed to the electron donation effect of potassium to nickel and this donation effect can promote the ability for breaking CC bond on the metal nickel sites.

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Keywords
Ethanol steam reforming; Nickel; Potassium; Perovskite-type oxide; Carbon deposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 259, Part 2, 1 January 2016, Pages 430–437
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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Any Questions? feel free to contact us