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Open AccessArticle

Conversion of 5-Methyl-3-Heptanone to C8 Alkenes and Alkane over Bifunctional Catalysts

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Department of Chemical Engineering, Kansas State University, 1005 Durland Hall, Manhattan, KS 66506, USA
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Department of Chemical Engineering, the University of Technology, Baghdad 10066, Iraq
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Microscopy and Analytical Imaging Laboratory, University of Kansas, 1043 Haworth, Lawrence, KS 66045, USA
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Department of Chemical, Paper, Biomedical Engineering, Miami University, 64 Engineering Building 650 E. High St, Oxford, OH 45056, USA
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(10), 845; https://doi.org/10.3390/catal9100845
Received: 25 September 2019 / Revised: 9 October 2019 / Accepted: 9 October 2019 / Published: 12 October 2019
A one-step catalytic process was used to catalyze the hydrodeoxygenation of 5-methyl-3-heptanone (C8 ketone) to a mixture of 5-methyl-3-heptene, 5-methyl-2-heptene (C8 alkenes), and 3-methyl heptane (C8 alkane). High conversion of C8 ketone to the desired products was achieved over a single bed of a supported catalyst (bifunctional heterogeneous catalyst) consisting of one transition metal (copper (Cu) or platinum (Pt)) loaded on alumina (Al2O3) under mild operating conditions (reaction temperatures were varied between 180 °C to 260 °C, and the pressure was 1 atm). The C8 ketone was hydrogenated to 5-methyl-3-heptanol (C8 alcohol) over metal sites, followed by dehydration of the latter on acid sites on the support to obtain a mixture of C8 alkenes. These C8 alkenes can be further hydrogenated on metal sites to make a C8 alkane. The results showed that the main products over copper loaded on alumina (20 wt% Cu–Al2O3) were a mixture of C8 alkenes and C8 alkane in different amounts depending on the operating conditions (the highest selectivity for C8 alkenes (~82%) was obtained at 220 °C and a H2/C8 ketone molar ratio of 2). However, over platinum supported on alumina (1 wt% Pt–Al2O3), the major product was a C8 alkane with a selectivity up to 97% and a conversion of 99.9% at different temperatures and all H2/C8 ketone ratios. View Full-Text
Keywords: hydrogenation–dehydration reactions; bifunctional catalyst; Cu supported on Al2O3; Pt supported on Al2O3; 5-methyl-3-heptanone hydrogenation–dehydration reactions; bifunctional catalyst; Cu supported on Al2O3; Pt supported on Al2O3; 5-methyl-3-heptanone
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Al-Auda, Z.; Al-Atabi, H.; Li, X.; Thapa, P.; Hohn, K. Conversion of 5-Methyl-3-Heptanone to C8 Alkenes and Alkane over Bifunctional Catalysts. Catalysts 2019, 9, 845.

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