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Catalytic behaviors of different zeolites loaded with platinum for continuous-flow hydroisomerization of endo-tetrahydrodicyclopentadiene

Wen-Ke Wang, Zhao-Lin Fu, Dan-Dan Jia, Cheng-Qiang Wang, Jie Zhao, En-Hui Xing, Yi-Bin Luo, Zhi-Ping Tao, and Xing-Tian Shu

Research Institute of Petroleum Processing, Sinopec, Haidian District, China

 

E-mail: taozp.ripp@sinopec.com

Received: 9 December 2021  Accepted: 2 March 2022

Abstract:

Hydroisomerization of endo-tetrahydrodicyclopentadiene (endo-THDCPD) into exo-tetrahydrodicyclopentadiene (exo-THDCPD) has been conducted over the zeolites loaded with 0.3 wt% of Pt. Consequently, both pore structure and acidity of zeolites gave a significant effect to the hydroisomerization process. The Pt/Beta, Pt/HY and Pt/REY provided over 90% initial endo-THDCPD conversion, while Pt/ZSM-5 and Pt/Mordenite showed very low activity, which was attributed to the larger pore size and larger amount of acid sites. The Pt/Beta provided high initial ring-opening by-products selectivity (62.2%) and low exo-THDCPD selectivity (37.3%), probably because of Pt/Beta exhibited shape-selectivity formation of ring-opening by-products. The Pt/REY showed higher exo-THDCPD selectivity than that of Pt/HY due to its fewer number of strong Brӧnsted acid sites. Besides, the results indicated that the optimum yield of exo-THDCPD was above 89% under the hydroisomerization reaction temperature, 150 °C; hydrogenation pressure, 0.5 MPa; weight hourly space velocity (WHSV), 1 h−1 and H2/endo-THDCPD molar ratio of 30. The results of stability test have indicated the high catalytic stability of Pt/REY.

Keywords: JP-10; Endo-tetrahydrodicyclopentadiene; Exo-tetrahydrodicyclopentadiene; Hydroisomerization; Pt/REY

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02160-w

 

Chemical Papers 76 (7) 4323–4331 (2022)

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