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Role of the oxide support on the performance of Rh catalysts for the autothermal reforming of gasoline and gasoline surrogates to hydrogen

Paper ID Volume ID Publish Year Pages File Format Full-Text
44657 46050 2006 11 PDF Available
Title
Role of the oxide support on the performance of Rh catalysts for the autothermal reforming of gasoline and gasoline surrogates to hydrogen
Abstract

Catalysts consisting of 2 wt% Rh deposited on Gd-CeO2, Y-ZrO2, γ-Al2O3, La-Al2O3, and CaAl12O19 were tested for the autothermal reforming (ATR) of isobutane and sulfur-free gasoline. The catalysts were characterized for activity by microreactor tests and temperature-programmed reduction (TPR), and for physical properties by surface area measurements, CO chemisorption, X-ray diffraction (XRD), and extended X-ray absorption fine structure (EXAFS) analyses. The order of activity for ATR of isobutane was Rh/La-Al2O3 > Rh/Y-ZrO2 > Rh/Gd-CeO2 > Rh/γ-Al2O3 > Rh/CaAl12O19, which paralleled the ranking of the catalysts based on the dispersion and reducibility of Rh, with Rh/La-Al2O3 having the highest dispersion and the lowest reduction temperature. After subjecting the catalysts to an accelerated ageing process, the activity for ATR of isobutane was similar for all catalysts except for Rh/Gd-CeO2, which experienced a significant loss in steam reforming activity. Rhodium dispersion measurements confirmed that the ageing process had caused Rh to sinter on all of the supports. A major conclusion from this study is that the primary effect of the support was on the dispersion of Rh.

Keywords
Rh; Ceria; Alumina; Zirconia; Hexaaluminate; Reforming; Isobutane; Gasoline; Deactivation; TPR; EXAFS
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Role of the oxide support on the performance of Rh catalysts for the autothermal reforming of gasoline and gasoline surrogates to hydrogen
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 311, 1 September 2006, Pages 135–145
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us