Selective Introduction of Acid Sites in Different Confined Positions in ZSM-5 and Its Catalytic Implications

By Chengeng Li, A. Vidal‐Moya, P. Miguel, J. Dědeček, M. Boronat, Avelino Corma. ACS Catalysis, 2018

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Controlling the location of acid sites in zeolites can have a great effect on catalysis. In this work we face the objective of directing the location of Al into the 10R channels of ZSM-5 by taking advantage of the structural preference of B to occupy certain positions at the channel intersections, as suggested by theoretical calculations. The synthesis of B-Al-ZSM-5 zeolites with variable Si/Al and Si/B ratios, followed by B removal in a postsynthesis treatment, produces ZSM-5 samples enriched in Al occupying positions at 10R channels. The location of the acid sites is determined on the basis of the product distribution of 1-hexene cracking as a test reaction. The higher selectivity to propene and lower C4=/C3= ratio in the samples synthesized with B and subsequently deboronated can be related to a larger concentration of acid sites in 10R channels, where monomolecular cracking occurs. Finally, several ZSM-5 samples have been tested in the methanol to propene reaction, and those synthesized through the B-...

Subfields: Inorganic Chemistry, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/e791e93ef06d19f433493cae38758c5d811dc15c

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