Reduction of Menthone with Isopropanol in the Presence of Palladium on Sibunit (ICT-3-31)
- Authors: Philippov A.A.1,2, Chibiryaev A.M.1,2
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Affiliations:
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences
- Novosibirsk State University
- Issue: Vol 10, No 4 (2018)
- Pages: 294-300
- Section: Catalysis in Chemical and Petrochemical Industry
- URL: https://journal-vniispk.ru/2070-0504/article/view/202936
- DOI: https://doi.org/10.1134/S2070050418040074
- ID: 202936
Cite item
Abstract
The catalytic properties of the industrial “palladium on sibunit” catalyst (ICT-3-31, 0.5 wt % Pd) were studied in the reduction of menthone into menthol. Menthone was reduced both at 250 and 350°C using isopropanol as an H-donor under the conditions of the hydrogen transfer reaction (HTR). For comparison, a noncatalytic reaction was performed under the same conditions. At 350°C the conversion of menthone was the same (61–62%) in the presence of the catalyst and without it. In the reaction with the catalyst, the selectivity on the desired product menthol decreased considerably (from 98% down to 23%), and the amount of the by-products increased (from 2 up to 77% based on changed menthone). When the temperature of the catalytic reaction was lowered to 250°C, the reduction selectivity increased to 42%, but the conversion of menthone decreased to 10%. All the products of menthone conversion were identified and pathways of their formation suggested. At 250–350°C the carbon support sibunit catalyzed the dehydration of menthone, which hindered the satisfactory yields of the target alcohol. Other side reactions catalyzed by ICT-3-31 were dehydrogenation into p-menthenes and their further aromatization resulted in the formation of substituted benzenes—p-cymene and thymol. ICT-3-31 can be effectively used in HTR, if more reactive organic substrates are involved in the reaction below 200–250°C or stronger H-donors are applied.
About the authors
A. A. Philippov
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University
Email: chibirv@catalysis.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
A. M. Chibiryaev
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University
Author for correspondence.
Email: chibirv@catalysis.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
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