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Hydrogen production from partial oxidation of iso-octane over Ni/Ce0.75Zr0.25O2 and Ni/β″-Al2O3 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43888 45993 2006 7 PDF Available
Title
Hydrogen production from partial oxidation of iso-octane over Ni/Ce0.75Zr0.25O2 and Ni/β″-Al2O3 catalysts
Abstract

In this study, the partial oxidation of iso-octane over Ni/Ce0.75Zr0.25O2 and Ni/β″-Al2O3 catalysts was investigated. The results indicated that Ni/Ce0.75Zr0.25O2 is more active than Ni/β″-Al2O3. The partial oxidation products were mainly H2 and CO for Ni/Ce0.75Zr0.25O2 catalyst, with hydrogen selectivity up to 53% in the temperature range of 550–800 °C with a C/O feed ratio of 1. The H2/CO ratio was in the range of 1.3–1.7 depending on the operating temperature. At temperatures above 700 °C, the presence of methane was detected. The main products of iso-octane partial oxidation over Ni/β″-Al2O3 catalyst were CO2 and i-C4H8 at temperatures below 650 °C while H2 and CO along with small amount of hydrocarbons such as CH4, C2H4, C2H6 and C3H6 were obtained at temperatures above 650 °C, yielding a H2/CO ratio of about 1.3. As a result, the hydrogen selectivity was lower than that of Ni/Ce0.75Zr0.25O2 catalyst. For both catalysts, the carbon dioxide and carbon monoxide selectivities were decreased whilst the hydrogen and hydrocarbons selectivities were increased with increasing C/O feed ratio. The Ni/Ce0.75Zr0.25O2 catalyst can be operated over a wider C/O feed ratio range than the Ni/β″-Al2O3 catalyst, resulting in less amount of carbon formed. The presence of steam in the feed yielded a larger amount of hydrogen and less amount of coke formation. Since the iso-octane conversion of both catalysts remained unchanged after a prolonged reaction time, a decrease in H2 selectivity for Ni/β″-Al2O3 catalyst may be attributed to the phase change of β″-Al2O3 in the presence of steam.

Keywords
iso-Octane; Partial oxidation; Ni/CeO2–ZrO2; Ni/β″-Al2O3
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Hydrogen production from partial oxidation of iso-octane over Ni/Ce0.75Zr0.25O2 and Ni/β″-Al2O3 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 302, Issue 1, 21 March 2006, Pages 133–139
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