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Tailoring the structure and acid site accessibility of mordenite zeolite for hydroisomerisation of n-hexane
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SYSNO ASEP 0490608 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Tailoring the structure and acid site accessibility of mordenite zeolite for hydroisomerisation of n-hexane Author(s) Pastvová, Jana (UFCH-W) RID, ORCID
Pilař, Radim (UFCH-W) RID, ORCID
Morávková, Jaroslava (UFCH-W) RID, ORCID
Kaucký, Dalibor (UFCH-W) RID, ORCID
Rathouský, Jiří (UFCH-W) RID, ORCID
Sklenák, Štěpán (UFCH-W) RID, ORCID, SAI
Sazama, Petr (UFCH-W) RID, ORCIDSource Title Applied Catalysis A - General. - : ELSEVIER SCIENCE BV - ISSN 0926-860X
Roč. 562, JUL 2018 (2018), s. 159-172Number of pages 14 s. Language eng - English Country NL - Netherlands Keywords Isomerisation ; Micromesoporous structure ; Mordenite (MOR) zeolites ; n-hexane ; Supermicroporosity Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects GA15-12113S GA ČR - Czech Science Foundation (CSF) LM2015073 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_013/0001821 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFCH-W - RVO:61388955 UT WOS 000443630600018 EID SCOPUS 85048269246 DOI 10.1016/j.apcata.2018.05.035 Annotation Mordenite zeolites with diffusion-restricted access to the acid sites located in mono-dimensional 12-ring channels and 8-ring side pockets have found broad applications as catalysts for hydroisomerisation of linear C5and C6alkanes and other highly relevant acid-catalysed processes. The accessibility of the porous structure of mordenite (MOR) zeolite is traditionally enhanced by dealumination, but this is invariably connected with a dramatic reduction in the aluminium content and corresponding concentration of the acid sites in the zeolites. Here we describe the preparation of MOR zeolite with high micropore volume, three-dimensional supermicropores (d ∼ 7.5 Å) and good acid site accessibility by concurrent extraction of Si and Al using postsynthesis fluorination-alkaline-acid treatment. The concurrent extraction of Si and Al enables formation of more developed supermicroporous structure and preservation of the molecular Si/Al. The procedure yields MOR with a crystalline structure in which the Si/Al ratio and the micropore volume can be tailored (Si/Al from ∼ 6, VMIup to 0.25 cm3.g−1) by the chemical conditions of the treatment. The Al-rich 3D supermicroporous structure with accessible Brønsted and Lewis active sites provides strongly enhanced activity, selectivity and long-term catalytic stability in the transformation of n-hexane into the corresponding branched isomers. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2019
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