Mild dealumination of template-stabilized zeolites by NH4F

Aleksei Bolshakov, Nikolay Kosinov (Corresponding author), Douglas Romero Hidalgo, Brahim Mezari, Arno van Hoof, Emiel Hensen (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

3 Citaten (Scopus)
43 Downloads (Pure)

Samenvatting

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.
Originele taal-2Engels
Pagina's (van-tot)4239-4247
Aantal pagina's9
TijdschriftCatalysis Science & Technology
Volume9
Nummer van het tijdschrift16
DOI's
StatusGepubliceerd - 21 aug 2019

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