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Steam reforming of ethanol over K promoted Co catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
39298 45817 2015 9 PDF Available
Title
Steam reforming of ethanol over K promoted Co catalyst
Abstract

•Steam reforming of ethanol over K promoted Co catalyst for efficient hydrogen production.•Promotion effect of K loading and the role of K were investigated.•Loading of 1–2 wt% K on Co/α-Al2O3 was effective for improving catalytic activity.•Co0–CoO core–shell structure was formed by K addition and shell–CoO was active for this reaction.•Adsorbed ethanol forms stable acetate species by K loading, which improves hydrogen selectivity.

We investigated the catalytic activity of Co/K/α-Al2O3 with various potassium (K) loadings for ethanol steam reforming. The promotion effect of K loading and the role of K in Co/K/α-Al2O3 were investigated using TEM–EDX, H2-TPR, XAFS, XPS, and IR measurements. Results show that loading of 1–2 wt% K on Co/α-Al2O3 was effective for improving catalytic activity, selectivity to hydrogen and suppressing by-product (CH4, C2H4, and coke) formations. Measurements by H2-TPR and XAFS showed that the reducibility of the supported Co species decreased by K loading. TEM measurements revealed that the Co0–CoO core–shell structure was formed over Co/K/α-Al2O3 during ethanol steam reforming at 823 K, suggesting that the oxidized Co species (CoO) is a highly active species in ethanol steam reforming. In situ IR measurements revealed that the adsorbed ethanol forms stable acetate species by K loading, which improves hydrogen selectivity.

Graphical abstractTEM images of Co/1K/α-Al2O3 after H2 reduction (1 h) after reaction (185 min).Figure optionsDownload full-size imageDownload high-quality image (373 K)Download as PowerPoint slide

Keywords
Ethanol steam reforming; Hydrogen production; K loading; Core–shell structure; In situ IR
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 495, 5 April 2015, Pages 30–38
Authors
, , , , , ,
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