fulltext.study @t Gmail

Water–gas shift reactions on potassium- and zirconium-promoted cobalt molybdenum carbide catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41997 45907 2010 8 PDF Available
Title
Water–gas shift reactions on potassium- and zirconium-promoted cobalt molybdenum carbide catalysts
Abstract

The preparation of carburized CoMo with alumina, potassium or zirconium added and their activity for the water–gas shift reaction at 453 K were investigated on the basis of XRD, temperature-programmed desorption (TPD) after H218O adsorption, transmission electron microscopy, and X-ray photoelectron spectroscopy. The carburized 5 wt% Al2O3/Co46.5Mo46.5K2Zr5 catalyst exhibited the highest CO conversion and TOF. The TPD experiment after H218O adsorption showed that the Zr-containing catalysts produced Co6Mo6C1 from β-Mo2C and Co metal, but the catalyst without zirconium produced MoO2 and Co3Mo. The presence of potassium significantly promotes water dissociation while zirconia prevented the oxidation of β-Mo2C. The Al2O3KZr-promoted CoMo catalyst exhibited a higher distribution of Co0 and Co2+ than the catalysts containing either zirconium or potassium in the presence of the Co3+ ions. The Al2O3KZr-promoted CoMo catalyst contained β-Mo2C, small Co metal particles and Co6Mo6C1 along with zirconia, potassium and alumina.

Graphical abstractThe preparation of carburized CoMo with alumina, potassium or zirconium added and their activity values for the water–gas shift reaction at 453 K were investigated. The presence of potassium significantly promoted water dissociation and that of zirconia prevented the oxidation of β-Mo2C during reaction on the carburized 5 wt%Al2O3/Co46.5Mo46.5K2Zr5 catalyst.Figure optionsDownload full-size imageDownload high-quality image (62 K)Download as PowerPoint slide

Keywords
Cobalt–molybdenum carbide; Potassium; Zirconium; Water dissociation; Oxidation resistance; Water–gas shift reaction; H218O-isotope
First Page Preview
Water–gas shift reactions on potassium- and zirconium-promoted cobalt molybdenum carbide catalysts
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 383, Issues 1–2, 31 July 2010, Pages 58–65
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
Online Support
Any Questions? feel free to contact us