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Influence of Mg modifier on cis-trans selectivity in partial hydrogenation of biodiesel using different metal types

Paper ID Volume ID Publish Year Pages File Format Full-Text
38931 45797 2016 8 PDF Available
Title
Influence of Mg modifier on cis-trans selectivity in partial hydrogenation of biodiesel using different metal types
Abstract

•Pd exhibits the highest C18:2 conversion at any reaction time.•High temperature provides high catalytic activity and trans-C18:1 formation.•Mg decreases trans-C18:1 formation due to the basicity of the catalyst.•Oxidative stability is improved by partial hydrogenation.

The catalytic performance of Pd, Pt, and Ni supported on SiO2 catalysts was investigated for partial hydrogenation of soybean methyl esters, in terms of FAME composition and biodiesel properties, especially oxidative stability and cold flow properties. The effect of Mg modifier over SiO2-supported catalysts on cis-trans selectivity of polyunsaturated FAMEs was also examined. The catalytic testing was performed under reaction conditions of 4 bar hydrogen pressure and 80–120 °C. Hydrogenation activity was presented by turnover frequency (TOF) of diunsaturated fatty acid (C18:2) within 4 h of the reaction time. The highest TOF was obtained over Pd catalysts, while the lowest TOF was obtained from Ni catalysts. At high reaction temperature conditions showed a large amount of cis-monounsaturated fatty acid (cis-C18:1); however, it exhibited a large amount of trans-monounsaturated fatty acid (trans-C18:1) which has a negative impact on biodiesel properties. The XPS revealed that the introduction of Mg leads to a strong metal–support interaction caused by electron transfer from the support to the metal, which decreased trans-C18:1 formation and presented the higher oxidative stability than the catalysts without Mg modifier.

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Keywords
Biodiesel; Partial hydrogenation; Selectivity; Oxidative stability; Cold flow properties; Mg
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Influence of Mg modifier on cis-trans selectivity in partial hydrogenation of biodiesel using different metal types
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 520, 25 June 2016, Pages 170–177
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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