Thermodynamic Analysis and Experimental Study of Selective Dehydrogenation of 1,2-cyclohexanediol over Cu 2+1 O/MgO Catalysts

Haiou Wang, Qiusheng Yang, Yucong Song and Yanji Wang
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Haiou Wang: School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China
Qiusheng Yang: School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China
Yucong Song: School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China
Yanji Wang: School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China

Sustainability, 2019, vol. 11, issue 3, 1-14

Abstract: The dehydrogenation of 1,2-cyclohexanediol (CHD) helps in the effective utilization of not only fossil derivatives but also vicinal diols and polyols from sustainable biomass-derived resources. A thermodynamic analysis of CHD dehydrogenation was computed with density functional theory (DFT) calculation using Gaussian 09. The result indicates that CHD can be converted to 2-hydroxy cyclohexanone (HCO), 2-hydroxy-2-cyclohexen-1-one (HCEO) and pyrocatechol depending on the degree of dehydrogenation. HCO and HCEO are the stable products of the primary and secondary dehydrogenation. Experimentally, Cu/MgO catalysts were prepared using glucose as a reductant, and were characterized by SEM, TEM, XRD, XPS, TPR, BET and ICP. Furthermore, their catalytic performance regarding the oxygen-free dehydrogenation of CHD was investigated. The results indicate that the primary active crystalline phase of Cu/MgO was Cu 2+1 O, and that the dehydrogenation products were mainly HCO and HCEO, in accordance with thermodynamic predictions. Upon optimizing the reaction conditions, the total selectivity of HCO and HCEO exceeded 90% and the conversion of CHD was approximately 95%.

Keywords: 1,2-cyclohexanediol; Cu 2+1 O/MgO; dehydrogenation; 2-hydroxy cyclohexanone; 2-hydroxy-2-cyclohexen-1-one (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
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