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Stability of cerium-modified γ-alumina catalyst support in supercritical water

Paper ID Volume ID Publish Year Pages File Format Full-Text
42041 45908 2010 6 PDF Available
Title
Stability of cerium-modified γ-alumina catalyst support in supercritical water
Abstract

Supercritical water (above 374.1 °C and 220.6 bar) is emerging as a promising medium to carry out a variety of catalytic reactions, including reforming to produce hydrogen. However, when using a heterogeneous catalyst the support material can undergo transformations in the hydrothermal environment. In this work the stability of γ-Al2O3 modified with 1–10 wt% Ce in supercritical water is examined, specifically in the temperature range of 500–700 °C at 246 bar. Transformations of the γ-phase were slowed but not prevented. Based on X-ray analysis, the transformation of γ-Al2O3 proceeded through the κ phase toward the stable α phase. Reduced cerium species were seen to be oxidized in the supercritical water environment, and low Ce-loading supports maintained the highest BET surface areas. The stabilization was greatest at 700 °C, where Ce-modified aluminas retained significantly higher specific surface areas than unmodified alumina.

Graphical abstractSupercritical water is emerging as a promising medium to carry out a variety of catalytic reactions. However the support material can undergo transformation in the hydrothermal environment, as shown in the figure below. In this work the stability of a common support material γ-Al2O3 is examined at 500–700 °C and 246 bar.Figure optionsDownload full-size imageDownload high-quality image (171 K)Download as PowerPoint slide

Keywords
Alumina; Hydrothermal; Supercritical water; Cerium; Stabilization
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Stability of cerium-modified γ-alumina catalyst support in supercritical water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 381, Issues 1–2, 15 June 2010, Pages 177–182
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