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Sustainability 2019, 11(3), 902; https://doi.org/10.3390/su11030902

Thermodynamic Analysis and Experimental Study of Selective Dehydrogenation of 1,2-cyclohexanediol over Cu2+1O/MgO Catalysts

1
School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China
2
Hebei Province Technology Institute of Green Chemical Industry, Hebei University of Technology, Tianjin 300130, China
*
Authors to whom correspondence should be addressed.
Received: 21 January 2019 / Revised: 8 February 2019 / Accepted: 9 February 2019 / Published: 10 February 2019
(This article belongs to the Special Issue Environment-Friendly Chemical Processes)
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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 Cu2+1O, 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%. View Full-Text
Keywords: 1,2-cyclohexanediol; Cu2+1O/MgO; dehydrogenation; 2-hydroxy cyclohexanone; 2-hydroxy-2-cyclohexen-1-one 1,2-cyclohexanediol; Cu2+1O/MgO; dehydrogenation; 2-hydroxy cyclohexanone; 2-hydroxy-2-cyclohexen-1-one
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, H.; Yang, Q.; Song, Y.; Wang, Y. Thermodynamic Analysis and Experimental Study of Selective Dehydrogenation of 1,2-cyclohexanediol over Cu2+1O/MgO Catalysts. Sustainability 2019, 11, 902.

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