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Ni-containing Ce-promoted hydrotalcite derived materials as catalysts for methane reforming with carbon dioxide at low temperature – On the effect of basicity

Paper ID Volume ID Publish Year Pages File Format Full-Text
53578 46975 2015 7 PDF Available
Title
Ni-containing Ce-promoted hydrotalcite derived materials as catalysts for methane reforming with carbon dioxide at low temperature – On the effect of basicity
Abstract

•Ceria addition increased reducibility of Ni species and introduced new basic sites.•New basic sites: low coordinated oxygen species and metal-oxygen pairs.•Ceria addition had positive effect on the catalytic activity and selectivity.•Hydrotalcite samples showed better performance than Ni/γ-Al2O3 and Ni/CZ in DRM.

NiMgAl mixed oxides promoted with cerium species were synthesized from their corresponding hydrotalcite precursors and subsequently characterized by elemental analysis, XRD, H2-TPR, CO2-TPD and N2 sorption techniques. The catalytic activity of the prepared catalysts was tested in the reaction of CO2 methane reforming and compared to the performance of two reference catalysts: 10Ni/Al2O3 and 10Ni/CZ (ceria-zirconia). The hydrotalcite derived materials showed a significant catalytic activity at 550 °C towards the dry reforming reaction. However, the simultaneous occurrence of undesired side reactions was as well observed, mainly CH4 decomposition and RWGS reaction. In this sense, the addition of cerium by ion-exchange with [Ce(EDTA)]− complexes resulted in higher activity and selectivity, due to an increase in the reducibility of nickel species and to the introduction of new intermediate and strong basic sites (acid-base pairs and low coordinated oxygen species). The reference catalysts showed considerable loss of catalytic activity during 5 h experiments, lower CO2 conversion (10Ni/CZ) and high excess of CO in the products of the reaction (10Ni/Al2O3), pointing to a generally better performance of the hydrotalcite derived catalysts.

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Keywords
Nickel; Ceria; Hydrotalcite; CO2; Reforming; Hydrogen
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Ni-containing Ce-promoted hydrotalcite derived materials as catalysts for methane reforming with carbon dioxide at low temperature – On the effect of basicity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 257, Part 1, 15 November 2015, Pages 59–65
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