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Effect of Ni-CNTs/mesocellular silica composite catalysts on carbon dioxide reforming of methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
39812 45837 2014 11 PDF Available
Title
Effect of Ni-CNTs/mesocellular silica composite catalysts on carbon dioxide reforming of methane
Abstract

•Novel composite catalysts of Ni-CNTs over mesocellular silica were synthesized.•A great improvement of catalyst stability in dry reforming reaction was reported.•Selective formation of carbon products as tube length extension of CNTs was found.

In this research, the novel composite catalysts between nickel and carbon nanotubes (CNTs) over mesocellular silica (MS) support were synthesized with an attempt to improve their stability to deactivation due to coke deposition in dry reforming reaction. Accordingly, the MS support was primarily prepared based on the synthesis of SBA-15 mesoporous silica with 1,3,5-trimethylbenzene (TMB) as a pore expanding agent. After that, nickel metal was loaded onto the MS support by using an incipient-wetness impregnation method, followed by CNTs synthesis via catalytic chemical vapor deposition (CCVD) technique through tip-growth mechanism. It was found that the existence of CNTs composite catalysts with nickel metal clusters on the tips of CNTs (Ni-CNTs/MS catalysts) could significantly improve the catalyst stability in dry reforming reaction (at 650 °C for 24 h) and simultaneously inhibit reverse water–gas shift reaction compared to that of Ni/MS catalyst. After 24 h time on stream, CO2 and CH4 conversions of Ni/MS catalyst were approximately decreased by 10%, while those of Ni-CNTs/MS catalyst were increased by 3%. This outstanding performance could be attributed to selective formation of carbon by-products as the tube-length extension of the existing CNTs. Accordingly, the active surface of Ni-CNTs/MS catalysts were remained constant throughout the period of dry reforming reaction.

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Keywords
Composite catalyst; Nickel; Carbon nanotubes; Mesocellular silica; Dry reforming reaction
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Effect of Ni-CNTs/mesocellular silica composite catalysts on carbon dioxide reforming of methane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 475, 5 April 2014, Pages 16–26
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