Volume 49 Issue 9
Sep.  2021
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YANG Jia-bao, HUI Yu, QIN Yu-cai, ZHANG Xiao-tong, WANG Huan, SONG Li-juan. Effect of Lewis acid sites of FER zeolite on catalytic transformation of isobutene[J]. Journal of Fuel Chemistry and Technology, 2021, 49(9): 1326-1335. doi: 10.1016/S1872-5813(21)60089-0
Citation: YANG Jia-bao, HUI Yu, QIN Yu-cai, ZHANG Xiao-tong, WANG Huan, SONG Li-juan. Effect of Lewis acid sites of FER zeolite on catalytic transformation of isobutene[J]. Journal of Fuel Chemistry and Technology, 2021, 49(9): 1326-1335. doi: 10.1016/S1872-5813(21)60089-0

Effect of Lewis acid sites of FER zeolite on catalytic transformation of isobutene

doi: 10.1016/S1872-5813(21)60089-0
Funds:  The project was supported by the National Natural Science Foundation of China (U20A20120, 21902068)
  • Received Date: 2021-03-11
  • Rev Recd Date: 2021-03-31
  • Available Online: 2021-04-30
  • Publish Date: 2021-09-30
  • A series of modified FER zeolite samples with different acid types, acid density and accessibility were prepared by using different concentrations of ammonium hexafluorosilicate (AHFS) for isomorphous substitution. The texture properties were characterized by XRD and N2 adsorption isotherms. And the acid properties were characterized by NH3-TPD and Py-FTIR. The results showed that when 1-butene and isobutene were respectively used as raw materials, the optimal reaction temperature for skeleton isomerization was 350 ℃, and the side reaction was more obvious when isobutene was used as raw material. During the dealumination process, two new Lewis acid sites with different strength were generated, due to the interaction between the dealumination agent and the extra framework aluminum hydroxyl species on the zeolite. During the reaction, the above two Lewis acid sites promoted the oligomerization-cracking of isobutene, thereby, reducing the selectivity of the main reaction.
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