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Center of Excellence in Petroleum Refining and Petrochemicals, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
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Catal. Sci. Technol., 2012,2, 1275-1286
27 Dec 2011,
19 Mar 2012
First published online
20 Mar 2012
Catalytic behavior of micro/mesoporous ZSM-5/MCM-41 composites were investigated in the transformation of 1,2,4-trimethylbenzene (TMB), meta-xylene transformation and in the cracking of 1,3,5-triisopropylbenzene (TIPB). The samples were characterized by XRD, TGA, SEM, nitrogen sorption and FTIR of pyridine adsorption. The composite materials exhibited exceptional catalytic performance compared with the microporous ZSM-5 in the transformation of 1,2,4-trimethylbenzene and m-xylene. In the cracking of 1,3,5-triisopropylbenzene, the composite materials showed higher activity as compared with the conventional Y-zeolite. The distinctive catalytic performance of these micro/mesoporous composite materials in the reactions studied was attributed to the excellent accessibility of the active sites provided by the mesopores for both reactant and product molecules. In the transformation of m-xylene, selectivity towards para-xylene over all catalysts under study follows the order: conventional ZSM-5 ≈ ZM41A1 < ZM41A2 < ZM41A3.
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Catalysis Science & Technology
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