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

by 1,2,3, 4, 1,2, 1,2,*, 1,2, 1,3, 1,2 and 1,2
College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology, Beijing 102617, China
Graduate School of Beijing University of Chemical Technology, Beijing 100029, China
Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan 030001, China
Author to whom correspondence should be addressed.
Catalysts 2018, 8(3), 105;
Received: 24 January 2018 / Revised: 7 February 2018 / Accepted: 7 February 2018 / Published: 6 March 2018
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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