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Effect of NiO content in mesoporous NiO–Al2O3 catalysts for high pressure partial oxidation of methane to syngas

Paper ID Volume ID Publish Year Pages File Format Full-Text
41512 45891 2011 9 PDF Available
Title
Effect of NiO content in mesoporous NiO–Al2O3 catalysts for high pressure partial oxidation of methane to syngas
Abstract

The effect of NiO content in mesoporous NiO–Al2O3 catalysts on stability of the catalytic activity was investigated for partial oxidation of methane to syngas under the reaction conditions at 650 °C and 1 MPa over the contact time range from 0.1 to 5 ms. Mesoporous/porous NiO–Al2O3 catalysts with a high BET surface area were prepared with NiO content of 3.7–75 wt%. From XRD patterns and TPR profiles observed in these catalysts before H2 pretreatment, the presence of strong interactions between NiO and Al2O3 was indicated, which gave relatively small NiO particles in the catalysts. As results of activity tests conducted by changing the contact time from 5 ms to lower until the catalyst lost its oxidation activity, the order of the catalyst tolerance against oxidation of nickel active species on them was: NiO(75)–Al2O3 > NiO(40)–Al2O3 > NiO(90)–Al2O3 > NiO(11)–Al2O3. As results of long runs and TG–DTA analysis, NiO(40)–Al2O3 showed the stable activity without any carbon deposition after 24 h reaction. This is because the Ni particle size and dispersion are 5.9–7.1 nm and 10.8%, respectively, which are considered to be suitable to prevent both carbon deposition and oxidation of nickel species during reaction, while NiO(75)–Al2O3 with Ni particle size of 11.7–15.9 nm gave high carbon deposition after a long run. The Ni particle size of 10 nm was a borderline for carbon deposition under reaction conditions at 1 MPa.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (88 K)Download as PowerPoint slideResearch highlights► Mesoporous NiO–Al2O3 catalyst shows high activity of oxidative reforming of methane at 650 °C and 1 MPa. ► The order of catalyst tolerance against oxidation of the nickel active species on them was: NiO(75)–Al2O3 > NiO(40)–Al2O3 > NiO(90)–Al2O3 > NiO(11)–Al2O3. ► NiO(40)–Al2O3 showed the stable activity without carbon deposition after 24 h reaction because of its moderate Ni particle size and Ni dispersion.

Keywords
Partial oxidation; Syngas formation; Oxidative reforming of methane; NiO–Al2O3 catalyst; Short contact time reaction; Mesoporous
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Effect of NiO content in mesoporous NiO–Al2O3 catalysts for high pressure partial oxidation of methane to syngas
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 395, Issues 1–2, 15 March 2011, Pages 129–137
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