High activity in catalytic cracking of large molecules over a novel micro-micro/mesoporous silicoaluminophosphate |
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Authors: | Jian Qi Tianbo Zhao Xin Xu Fengyan Li Guida Sun |
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Affiliation: | (1) The Institute for Chemical Physics, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, 100081 Beijing, People’s Republic of China;(2) Department of Applied Chemistry, Beijing Institute of Petrochemical Technology, 102617 Beijing, People’s Republic of China; |
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Abstract: | Abstract A novel micro-micro/mesoporous silicoaluminophosphate ZSM-5-SAPO-5/MCM-41 (define as MZS-5) composite material with regular
spherical morphology was synthesized through a novel process of the self-assembly of CTAB surfactant micelles with silica-alumina
source which originated from the alkaline treatment of ZSM-5 zeolite. The physical properties of the MZS-5 composite material
were characterized by XRD, FT-IR, Nitrogen adsorption–desorption, SEM and Py-FTIR techniques. Catalytic tests showed that
the MZS-5 composite catalyst exhibited higher catalytic activity compared with the conventional microporous ZSM-5, SAPO-5
zeolite and mesoporous Al-MCM-41 molecular sieve for catalytic cracking of 1,3,5-triisopropylbenzene (TIPB). The remarkable
catalytic reactivity of TIPB molecules was mainly attributed to the presence of the hierarchical zeolite structure. In the
MZS-5 structure, the mesopores provided pathways for transportation of larger molecules and the microporous ZSM-5 and SAPO-5
zeolite provided acidic sites for catalytic activity. |
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