Kinetics of furfural electrochemical hydrogenation and hydrogenolysis in acidic media on copper [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 621.48 Nuclear engineering

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2021

Mô tả vật lý: Size: p. 2075-2086 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 262488

 Electrochemical processes can be implemented for the valorization of biomass-derived species such as furfural to generate fine chemicals and fuels. The electrochemical hydrogenation and hydrogenolysis (ECH) of furfural (FF) can produce furfuryl alcohol (FA) and 2-methylfuran (MF) as the major products over Cu catalysts in acidic conditions. The production of these species are in competition and the kinetics of these reactions should be studied so that the product distribution can be better controlled. In this work, the competing kinetics of furfural ECH to furfuryl alcohol and 2-methylfuran were studied on Cu in acidic media by using the applied cathodic potential, temperature, and initial concentration of furfural as probes. Furthermore, an increased temperature of the system was shown to promote the MF production in the range tested (15 �C and 45 �C), however the production of FA was decreased when the temperature was increased from 35 �C to 45 �C, due to significant promotion of side reactions. By varying the concentration of FF used in bulk electrolysis, we saw that the rates of reaction to FA and MF shift from positive order to zero order, suggesting a Langmuir?Hinshelwood or Eley?Rideal mechanism at ?0.56 V vs. RHE and 25 �C. An analysis of the reaction mechanisms showed that a non-competitive Langmuir?Hinshelwood mechanism is likely occurring. In addition, we suggest the likely rate limiting steps based on the mechanisms are the first hydrogenation step of FF to C<
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 H<
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 O?CHOH intermediate to form MF.
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