Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 9, Issue 16, Pages 4239-4247Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cy00593e
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Funding
- Impuls program of the Eindhoven University of Technology
- TOP grant of the Netherlands Organisation for Scientific Research
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A novel method to remove aluminium from the framework of as-synthesized zeolite crystals is presented. Hydrothermal treatment in an aqueous ammonium fluoride solution leads to selective dealumination of ZSM-5-TPA zeolite crystals. The optimized dealumination procedure results in 30-50% removal of Al atoms without significant structural degradation. It is also shown that template stabilization by tetrapropylammonium cations or pentaerythritol plays a key role in the developed method, as template-free ZSM-5 crystals, treated under similar conditions, lose their crystallinity and microporosity. The mild dealumination was applied to as-synthesized hierarchical mordenite zeolite to obtain a much more effective catalyst in hydroconversion of heavy paraffins. The optimized Pd/MOR catalyst showed a low selectivity to cracked products up to 60% of n-hexadecane conversion with product distribution close to the ideal hydrocracking regime.
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