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Catalysts 2018, 8(3), 105; https://doi.org/10.3390/catal8030105

Synthesis of Tetrahydropyran from Tetrahydrofurfuryl Alcohol over Cu–Zno/Al2O3 under a Gaseous-Phase Condition

1
College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
2
Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology, Beijing 102617, China
3
Graduate School of Beijing University of Chemical Technology, Beijing 100029, China
4
Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan 030001, China
*
Author to whom correspondence should be addressed.
Received: 24 January 2018 / Revised: 7 February 2018 / Accepted: 7 February 2018 / Published: 6 March 2018
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Abstract

Tetrahydropyran (THP) represents an O-containing hetero-cyclic compound that can be used as a promising solvent or monomer for polymer synthesis. In this work, Cu–ZnO/Al2O3 catalysts have been prepared by a facile precipitation–extrusion method and used for the synthesis of THP through gaseous-phase hydrogenolysis of tetrahydrofurfuryl alcohol (THFA). The effect of the molar ratio of Cu/Zn/Al, reaction temperature, and hydrogen pressure was investigated. An 89.4% selectivity of THP was achieved at 270 °C and 1.0 MPa H2. Meanwhile, the optimum molar ratio of Cu/Zn/Al was determined to be 4:1:10. The Cu–ZnO/Al2O3 catalyst exhibited high catalytic activity and stability for 205 h on-stream. A possible reaction mechanism involving several consecutive reactions was proposed: THFA was firstly rearranged to 2-hydroxytetrahydropyran (2-HTHP), followed by the dehydration of 2-HTHP to 3,4-2H-dihydropyran (DHP) over acid sites; finally, the DHP was hydrogenated to THP. The synergy of acid sites and metal sites of Cu–ZnO/Al2O3 played an important role during the production of THP. View Full-Text
Keywords: tetrahydropyran; tetrahydrofurfuryl alcohol; Cu–ZnO/Al2O3 tetrahydropyran; tetrahydrofurfuryl alcohol; Cu–ZnO/Al2O3
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Zhang, F.; Zhang, B.; Wang, X.; Huang, L.; Ji, D.; Du, S.; Ma, L.; Lin, S. Synthesis of Tetrahydropyran from Tetrahydrofurfuryl Alcohol over Cu–Zno/Al2O3 under a Gaseous-Phase Condition. Catalysts 2018, 8, 105.

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