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Effect of La2O3 doping on syntheses of C1–C18 mixed linear α-alcohols from syngas over the Co/AC catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42873 45944 2009 6 PDF Available
Title
Effect of La2O3 doping on syntheses of C1–C18 mixed linear α-alcohols from syngas over the Co/AC catalysts
Abstract

Activated carbon-supported La-promoted Co catalysts with different La dopings (15Co–xLa/AC) were prepared by the co-impregnation method and investigated by means of CO hydrogenation, XRD, TPR-MS, CO adsorption and TPSR-MS techniques. The results showed that mixed linear α-alcohols (C1–C18) can be directly synthesized from syngas over the La-doped 15Co/AC catalysts under mild conditions and that the selectivity towards alcohols was improved by doping La into the 15Co/AC catalysts. It was found that the reducibility of the 15Co–xLa/AC catalyst decreased and the Co dispersion improved due to the strong interaction between Co and La2O3 species. La2O3 can promote the formation of cobalt carbides (Co2C), which are postulated to play an important role in the syntheses of the mixed linear α-alcohols. On the other hand, high Co dispersion and an appropriate ratio of Co2+/Co0 can enhance the activity of CO hydrogenation.

Graphical abstractThe α-alcohols (C1–C18) can be directly synthesized from syngas over the La-doped 15Co/AC catalysts. The reducibility of the 15Co–xLa/AC catalyst decreased and the Co dispersion improved due to the strong interaction between Co and La2O3 species. La2O3 can promote the formation of cobalt carbides (Co2C) which are postulated to play an important role in the synthesis of α-alcohols.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Mixed linear α-alcohols; La doping; Fischer–Tropsch synthesis; Co–xLa/AC catalysts; Co2C species
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Effect of La2O3 doping on syntheses of C1–C18 mixed linear α-alcohols from syngas over the Co/AC catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 364, Issues 1–2, 31 July 2009, Pages 137–142
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
100% Money Back Guarantee
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