کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
65567 | 48396 | 2014 | 10 صفحه PDF | دانلود رایگان |
• A highly flexible approach for valorization of alkyl levulinates in regard to the control over the product selectivity is demonstrated.
• The features distinguishing the energetics of the transfer vs. conventional hydrogenation of methyl levulinate is addressed.
• The thermal stability of methyl γ-hydroxypentanoate in the absence and in the presence of solid catalysts is examined.
• The stability of Raney Ni in the conversion of several alkyl levulinates is assessed.
• A process concept based on H-transfer conversion of alkyl levulinates is also proposed.
Alkyl γ-hydroxypentanoates and γ-valerolactone are promising platform chemicals that can be produced from alkyl levulinates in the lignocellulosic biorefinery. Accordingly, this report aims to provide in-depth insight into the molecular aspects involved in the conversion of alkyl levulinates by H-transfer catalyzed by Raney Ni and using 2-propanol as an H-donor and solvent. We demonstrate this methodology as a highly flexible approach in regard to the high degree of control over the product selectivity. In fact, up to 90% yield of alkyl γ-hydroxypentanoates is obtained at temperatures as low as 298 K. In turn, 94% yield of γ-valerolactone is achieved at 393 K. In order to shed light on the fundamental aspects of this chemical route, we address: (1) the energetics of the transfer vs. conventional hydrogenation of methyl levulinate, (2) the thermal stability of methyl γ-hydroxypentanoate in the absence and in the presence of solid catalysts, and (3) the stability of Raney Ni in the conversion of several alkyl levulinates. Lastly, a process concept based on the current results is also proposed. This concept provides a comprehensive overview of the practical possibilities of this process as part of the lignocellulose-based biorefineries.
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Journal: Journal of Molecular Catalysis A: Chemical - Volumes 388–389, July 2014, Pages 106–115