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RESEARCH PRODUCT
Selective Introduction of Acid Sites in Different Confined Positions in ZSM-5 and Its Catalytic Implications
Alejandro Vidal-moyaJiri DedecekMercedes BoronatChengeng LiPablo J. MiguelAvelino Cormasubject
Al siting02 engineering and technology010402 general chemistryFluid catalytic cracking01 natural sciencesDFTCatalysisCatalysisPropenechemistry.chemical_compoundQUIMICA ORGANICABoron ZSM-5General Chemistry021001 nanoscience & nanotechnologyProduct distribution0104 chemical sciencesCrystallographyCrackingchemistryCatalytic crackingZeolitesMethanolZSM-5MTO0210 nano-technologySelectivitydescription
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 C /C 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-assisted method show longer catalytic lifetime, higher propene yield, and lower yield of alkanes and aromatics.
year | journal | country | edition | language |
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2018-07-10 | ACS Catalysis |