Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (11): 20230208.doi: 10.7503/cjcu20230208

• Physical Chemistry • Previous Articles     Next Articles

Morphology Controlled Synthesis of ZSM-22 Molecular Sieves and Their Catalytic Performance on Long-chain Bioalkane to Aviation Kerosene

ZHAO Chen, TAN Juan(), HAN Jingjing, LIU Rui, FENG Chunshuo, LIU Jing   

  1. School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China
  • Received:2023-04-25 Online:2023-11-10 Published:2023-06-07
  • Contact: TAN Juan E-mail:tanjuan@dlut.edu.cn

Abstract:

In this paper, ZSM-22 zeolites with different crystal or aggregate morphologies, such as short rods, long needles, petals, thick rods, ellipsoids and coarse bundles, were synthesized through adding different additives, solvents or template agents. HZSM-22 catalysts with different morphologies were characterized by XRD, SEM, N2 physical adsorption, NH3-TPD and Py-IR techniques. The performance of HZSM-22 catalysts with different morphologies was evaluated on the hydrocracking and hydroisomerization of long-chain normal bio-paraffins obtained from the hydrodeoxygenated curcas oil to bio-jet fuel. The results showed that the catalyst C-4 with ellipsoid aggregate appearance was assembled by small crystals with a length of about 120 nm, which possesses a large surface area and plenty of B acid sites at the pore mouth of channel. On this basis, Pt/ZSM-22 catalysts were prepared by the equal volume impregnation method using HZSM-22 with different morphologies as support. The Pt/C-4 catalyst presented excellent hydrocracking and isomerization performance and stability. The conversion of long-chain normal bio-paraffins over Pt/C-4 reached 94.21%, and the yield of bio-jet fuel was as high as 47.87% with an iso/n-paraffin ratio of 6.0.

Key words: Hydrocracking/isomerization, ZSM-22 molecular sieve, Morphology, Long-chain normal bio-paraffins, Bio-jet fuel

CLC Number: 

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