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Methanation of CO, CO2 and selective methanation of CO, in mixtures of CO and CO2, over ruthenium carbon nanofibers catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41521 45892 2010 10 PDF Available
Title
Methanation of CO, CO2 and selective methanation of CO, in mixtures of CO and CO2, over ruthenium carbon nanofibers catalysts
Abstract

The catalytic performance of ruthenium catalysts supported on carbon nanofibers for the methanation of CO, CO2 and their mixture has been investigated with respect to the nature of carbon nanofibers (orientation of graphite planes): platelet, fishbone and ribbon. Experiments were conducted in the temperature range of 200–500 °C using feed compositions relevant to those of reformate gas streams, both in the absence and in the presence of water. It has been found that, under conditions of solo-CO methanation, all the investigated catalysts are able to completely and selectively convert CO at temperatures around 340 °C, with the conversion of CO being somewhat higher for the Ru/platelet sample. For hydrogenation of CO2 alone, catalytic performance is not affected by the nature of the carbon nanofibers used as support. In combined hydrogenation of CO/CO2 mixtures, catalytic performance for all the investigated catalysts is poor since they promote the undesired reverse water–gas shift reaction. However, addition of 30% water vapour in the feed inhibits the reverse water–gas shift, thereby enhancing CO hydrogenation. Results of kinetic measurements show that the turnover frequency of CO conversion becomes 2–3 times higher in the presence of steam over Ru/fishbone and Ru/platelet samples over the whole temperature range examined, whereas in the case of Ru/ribbon catalyst temperatures higher than 250 °C are required in order to achieve higher turnover frequency values. Carbon dioxide hydrogenation is not affected by the presence of steam. For all experimental conditions investigated, selectivity toward methane increases with increasing temperature at the expense of higher hydrocarbons and is enhanced with the addition of water vapour in the gas mixture.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (39 K)Download as PowerPoint slideResearch highlights▶ In solo-CO methanation high conversion and selectivity is obtained. ▶ Catalytic performance of CO2 alone is not affected by type of CNFs. ▶ Addition of 30% water vapour in the feed inhibits the RWGS. ▶ Addition of 30% water vapour enhancing CO hydrogenation.

Keywords
CO methanation; CO2 methanation; Selective methanation of CO; Ruthenium; Fuel cell applications; Carbon nanofibers
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Methanation of CO, CO2 and selective methanation of CO, in mixtures of CO and CO2, over ruthenium carbon nanofibers catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 390, Issues 1–2, 20 December 2010, Pages 35–44
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