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The oxidative dehydrogenation of n-octane to styrene using catalysts derived from hydrotalcite-like precursors

Paper ID Volume ID Publish Year Pages File Format Full-Text
42887 45945 2008 12 PDF Available
Title
The oxidative dehydrogenation of n-octane to styrene using catalysts derived from hydrotalcite-like precursors
Abstract

A number of hydrotalcite-like compounds containing Mg and V were prepared with different Mg/V ratios, ranging from 1:1 to 4:1. The effect of variations in synthesis procedures, such as preparing the compounds under inert gas, hydrothermal treatments at different temperatures and different precipitating agents were examined. These compounds were characterised by ICP-OES, powder XRD (including, in part, in situ powder XRD under H2, air and N2), Raman (incl. in situ), IR, XPS and SEM. They were then investigated as catalysts for the aerobic oxidation of n-octane under varying conditions of GHSV, temperature and feed/air ratio. Styrene was found to be the dominant organic product and a maximum selectivity of 19%, corresponding to a yield of 14%, was obtained with a catalyst with a Mg/V ratio of 2.3. The mechanism appears to involve olefin formation, followed by cyclisation to form ethyl benzene, which is further dehydrogenated to form styrene. Catalysts where the precursors have more amorphous structures were found to be superior to those obtained from highly crystalline precursors, and catalysts derived from sodium salts were superior to those obtained from potassium salts.

Graphical abstractCatalysts with varying Mg/V ratio, derived from hydrotalcite-like precursors, were investigated in aerobic oxidation of n-octane under varying conditions of GHSV, temperature and feed/air ratio. Styrene was found to be the dominant organic product with a maximum selectivity of 19% obtained over a catalyst with a Mg/V ratio of 2.3.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Alkane (paraffin) oxidation; n-Octane; Styrene; Hydrotalcite; In situ characterisation
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The oxidative dehydrogenation of n-octane to styrene using catalysts derived from hydrotalcite-like precursors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 347, Issue 1, 1 September 2008, Pages 11–22
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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