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Ceria-based oxides as supports for LaCoO3 perovskite; catalysts for total oxidation of VOC

Paper ID Volume ID Publish Year Pages File Format Full-Text
48823 46522 2007 6 PDF Available
Title
Ceria-based oxides as supports for LaCoO3 perovskite; catalysts for total oxidation of VOC
Abstract

Supported LaCoO3 perovskites with 10 and 20 wt.% loading were obtained by wet impregnation of different Ce1−xZrxO2 (x = 0–0.3) supports with a solution prepared from La and Co nitrates, and citric acid. Supports were also prepared using the “citrate method”. All materials were calcined at 700 °C for 6 h and investigated by N2 adsorption at −196 °C, XRD and XPS. XRD patterns and XPS measurements evidenced the formation of a pure perovskite phase, preferentially accumulated at the outer surface. These materials were comparatively tested in benzene and toluene total oxidation in the temperature range 100–500 °C. All catalysts showed a lower T50 than the corresponding Ce1−xZrxO2 supports. Twenty weight percent LaCoO3 catalysts presented lower T50 than bulk LaCoO3. In terms of reaction rates per mass unit of perovskite calculated at 300 °C, two facts should be noted (i) the activity order is more than 10 times higher for toluene and (ii) the reverse variation with the loading as a function of the reactant, a better activity being observed for low loadings in the case of benzene. For the same loading, the support composition influences drastically the oxidative abilities of LaCoO3 by the surface area and the oxygen mobility.

Keywords
Supported perovskite; Ceria support; VOC catalytic combustion
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Ceria-based oxides as supports for LaCoO3 perovskite; catalysts for total oxidation of VOC
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 70, Issues 1–4, 31 January 2007, Pages 400–405
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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