fulltext.study @t Gmail

CO methanation over supported bimetallic Ni–Fe catalysts: From computational studies towards catalyst optimization

Paper ID Volume ID Publish Year Pages File Format Full-Text
44423 46025 2007 7 PDF Available
Title
CO methanation over supported bimetallic Ni–Fe catalysts: From computational studies towards catalyst optimization
Abstract

DFT calculations combined with a computational screening method have previously shown that bimetallic Ni–Fe alloys should be more active than the traditional Ni-based catalyst for CO methanation. That was confirmed experimentally for a number of bimetallic Ni–Fe catalysts supported on MgAl2O4. Here, we report a more detailed catalytic study aimed at optimizing the catalyst performance. For this purpose, two series of mono and bimetallic Ni–Fe catalysts supported on MgAl2O4 and Al2O3, respectively, were prepared. All catalysts were tested in the CO methanation reaction in the temperature interval 200–300 °C, and characterized using elemental analysis, N2 physisorption measurements, XRD and TEM. Optimization of the catalyst performance was made by varying the Ni:Fe ratio, the total metal loading and the support material. For both support materials, the bimetallic catalysts with compositions 25Fe75Ni and 50Fe50Ni showed significantly better activity and in some cases also a higher selectivity to methane compared with the traditional monometallic Ni and Fe catalysts. A catalyst with composition 25Fe75Ni was found to be the most active in CO hydrogenation for the MgAl2O4 support at low metal loadings. At high metal concentrations, the maximum for the methanation activity was found for catalysts with composition 50Ni50Fe both on the MgAl2O4 and Al2O3 supports. This difference can be attributed to a higher reducibility of the constituting metals with increasing metal concentration. The maximum of the catalytic activity and the highest selectivity to methane were observed for the sample with 20 wt% total metal loading. It appears that it is possible to increase substantially the efficiency of Ni-based methanation catalyst by alloying with Fe.

Graphical abstractIn accordance with predictions from computation screening studies, it is shown that alloyed Fe–Ni catalysts are superior to the pure Fe and Ni catalysts in the methanation reaction. The influence of the support material, the alloy composition and the total metal content is investigated to identify the best catalyst for industrial applications.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Methanation; Nickel; Iron; Bimetallic catalyst; Interpolation concept
First Page Preview
CO methanation over supported bimetallic Ni–Fe catalysts: From computational studies towards catalyst optimization
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 320, 22 March 2007, Pages 98–104
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