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Effect of alkali cations on the CuZnOAl2O3 low temperature water gas-shift catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
55701 47062 2011 5 PDF Available
Title
Effect of alkali cations on the CuZnOAl2O3 low temperature water gas-shift catalyst
Abstract

Low temperature water gas-shift catalysts containing 1.0% by weight of alkali elements (Li, K, Rb and Cs) were prepared by impregnation of a ternary Cu/ZnO/Al2O3 (CZA) base catalyst. The calcined precursors were characterized by different physical and chemical techniques such as X-ray diffraction, X-ray fluorescence, N2O chemisorption, N2 adsorption at low temperature and X-ray photoelectron spectroscopy. Then these precursors were activated and tested in the low temperature water gas-shift reaction (LT-WGS). It was shown that the K-containing CZA catalyst exhibited the highest CO conversion level at reaction temperature within the range 450–530 K. In addition, the alkali promoters were found to prevent methanol production at temperatures higher than 480 K.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (89 K)Download as PowerPoint slideHighlights► Alkali promoters were efficient in preventing methanol production at T > 480 K. ► H2 selectivity was higher than 96% in the range of 450–530 K. ► Cu/ZnO/Al2O3-K showed the highest CO conversion within the temperature range. ► Copper metallic area decreased slightly upon incorporation of the alkali promoter.

Keywords
Low temperature water gas-shift reaction; Alkali promoters; Methanol synthesis; Selectivity
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Effect of alkali cations on the CuZnOAl2O3 low temperature water gas-shift catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 172, Issue 1, 25 August 2011, Pages 166–170
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