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Spectroscopic characterization and catalytic activity of Rh supported on CeO2-modified Al2O3 for low-temperature steam reforming of propane

Paper ID Volume ID Publish Year Pages File Format Full-Text
53399 46968 2016 13 PDF Available
Title
Spectroscopic characterization and catalytic activity of Rh supported on CeO2-modified Al2O3 for low-temperature steam reforming of propane
Abstract

•Loading Al2O3 with 5–75% CeO2 affects surface chemistry of Rh catalysts.•FE-SEM reveals that ceria is dispersed as separate nanoparticle islands on Al2O3.•20% CeO2 loading of Al2O3 synergistically enhances activity of Rh catalyst.•Rh on the interfacial region of CeO2–Al2O3 is more active than on CeO2 or Al2O3 alone.

The present work aims at clarifying the effects of CeO2 addition to Al2O3 support on the surface chemical characteristics and catalytic activity of supported Rh catalysts for low-temperature steam reforming of propane. Steam reforming of propane was carried out at 500 °C over Rh catalysts supported on alumina modified with different CeO2 loading (0, 5, 10, 20, 50, 75, and 100 wt%). The Rh catalyst supported on 20 wt% CeO2-modified alumina (2Rh/20CeAl) showed the highest propane and steam conversions, followed in decreasing order by those with 10, 5, 50, 75, 0, and 100 wt% CeO2. TPR results show that the interaction between ceria and rhodium improves the reducibility of both rhodium oxide and ceria. XPS analysis indicates strong ceria–alumina interaction and strong Rh-support interaction for Rh catalysts with CeO2 loading less than 20 wt%. Field-Emission SEM and AES results revealed that at 20 wt% CeO2 loading, ceria was dispersed as separate nano-particles with sizes of 100–200 nm on the alumina surface. At high CeO2 loading (≥50 wt%) ceria particles formed conglomerates covering alumina surface. The 2Rh/20CeAl catalyst showed the highest activity for propane steam reforming possibly because the high CeO2 dispersion created a large area of ceria–alumina interface which helped increase Rh dispersion, and the strong interaction between Rh and support helped enhance the reducibility of ceria and rhodium oxide. Rh loaded onto the interfacial region of ceria and alumina is considered to be most active for the 2Rh/20CeAl catalyst.

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Keywords
Catalyst; Rh; Alumina; Ceria loading; Steam reforming; Propane
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Spectroscopic characterization and catalytic activity of Rh supported on CeO2-modified Al2O3 for low-temperature steam reforming of propane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 263, 1 April 2016, Pages 22–34
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