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Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

Paper ID Volume ID Publish Year Pages File Format Full-Text
46667 46444 2012 8 PDF Available
Title
Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel
Abstract

The hydrothermal stability of Pd-based methane combustion catalyst was investigated under lean-fuel conditions, such as ventilation air methane. For the catalyst, the active component Pd was impregnated on Ni-modified alumina supports which were prepared by a modified method. The method was coupled with the conventional co-precipitation and hydrothermal synthesis process. A series of Pd catalysts and supports prepared, which had the Ni/Al ratios of 1:4, 1:2 and 1:1, were characterized by BET, CO-chemisorption, XRD, TPR, SEM and TEM. The relationship between active sites and supports was studied using HRTEM. In addition, the performances for lean methane combustion of all catalysts were studied. Results showed that the catalyst on well crystallized NiAl2O4 spinel support exhibited the superior hydrothermal stability. Methane conversion remained 96% after 3200 h at 873 K. Such excellent catalytic performance has been validated to relate to the stabilizing effect of support and the least lattice mismatch between NiAl2O4 and Pd, which contributed to high Pd dispersion.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Pd/Al2O3 catalyst modified by nickel for methane combustion under lean-fuel condition. ► Catalyst on NiAl2O4 support demonstrates the most excellent hydrothermal stability. ► The methane conversion of Pd/NiAl2O4 was still about 96% at 823 K after 3200 h test. ► The least lattice mismatch between Pd and NiAl2O4 leads to high Pd dispersion. ► Pd/NiAl2O4 catalyst is an appropriate candidate for lean fuel methane combustion.

Keywords
Ventilation air methane combustion; Palladium; NiAl2O4 spinel; Lattice mismatch
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Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 119–120, 30 May 2012, Pages 321–328
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