Hydrogenolysis of sorbitol to glycols over carbon nanofibers-supported ruthenium catalyst：The role of base promoter

doi:10.1016/S1872-2067(14)60083-8

Abstract

Abstract:

Sorbitol hydrogenolysis over carbon nanofibers-supported Ru (Ru/CNFs) was carried out with different bases (NaOH, KOH, Mg(OH)₂, Ba(OH)₂, and CaO) to investigate the role of base promoter. The results indicated that all the bases used significantly enhanced the sorbitol conversion while the glycol selectivities varied with the base type and amount. CaO was the best base in terms of glycol selectivity for two reasons. CaO provided OH^- for the base-promoted cleavage of C-C bonds, while it also supplied Ca²⁺ for complexation with the intermediate aldehydes, thus affecting the reaction pathways. We identified an optimum ratio among sorbitol concentration, Ru/CNFs catalyst, and CaO to achieve favorable glycol selectivities in sorbitol hydrogenolysis. Reaction pathways for sorbitol hydrogenolysis into glycols in aqueous solution in the presence of CaO have been proposed based on the mechanistic study.

Key words: Sorbitol, Hydrogenolysis, Base promoter, Glycol, Ruthenium catalyst

Jinghong Zhou, Guocai Liu, Zhijun Sui, Xinggui Zhou, Weikang Yuan. Hydrogenolysis of sorbitol to glycols over carbon nanofibers-supported ruthenium catalyst：The role of base promoter[J]. Chinese Journal of Catalysis, 2014, 35(5): 692-702.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60083-8

https://www.cjcatal.com/EN/Y2014/V35/I5/692

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