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Reduction and catalytic behaviour of nanostructured Pd/gadolinia-doped ceria catalysts for methane combustion

Paper ID Volume ID Publish Year Pages File Format Full-Text
46318 46437 2013 11 PDF Available
Title
Reduction and catalytic behaviour of nanostructured Pd/gadolinia-doped ceria catalysts for methane combustion
Abstract

In the present work, 1 wt% and 5 wt% Pd/GDC10 (Gd0.1Ce0.9O1.95) nanopowders were prepared by two different methods: (a) cation complexation (CC) and (b) incipient wetness impregnation (WI) of an aqueous Pd2+ solution onto GDC10 nanopowders. All samples were characterised by X-ray diffraction (XRD), thermal analysis (TG/DTA), specific surface area determination and high resolution transmission electron microscopy (HRTEM). In order to study the oxidation state of Pd in samples with and without reducing treatments, XANES experiments at the Pd L3-edge were carried out. In situ Ce L3-edge XANES experiments were performed under reducing conditions in order to investigate the reduction behaviour of these materials. The addition of Pd to the GDC10 nanopowders increased the reducibility of Ce in the mixed oxide. Finally, catalytic tests for CH4 combustion were performed on the Pd/GDC10 nanopowders. Catalysts with higher Pd loading (5 wt%) exhibited the best performance for CH4 combustion. The influence of preparation method was evident for catalysts with 1 wt% Pd, the cation complexation method resulting in more active catalysts than the wetness impregnation method.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► 1 wt% and 5 wt% Pd/GDC10 nanopowders were prepared by cation complexation (CC) and incipient wetness impregnation (WI). ► Reduction behaviour was studied by in situ synchrotron radiation techniques. ► The addition of Pd increased the reducibility of the Ce in the mixed oxide. ► Catalysts with 5 wt% Pd loading exhibited the best performance for CH4 combustion. ► 1 wt% Pd nanopowders prepared by CC resulting in more active catalysts than those prepared by the WI method.

Keywords
Solid oxide fuel cells; Supported Pd catalysts; Nanostructured ceria-gadolinia catalyst supports; HRTEM; X-ray powder diffraction; X-ray absorption spectroscopy
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Reduction and catalytic behaviour of nanostructured Pd/gadolinia-doped ceria catalysts for methane combustion
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 136–137, 5 June 2013, Pages 122–132
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