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FTIR and (27)Al MAS NMR analysis of the effect of framework Al- and Si-defects in micro- and micro-mesoporous H-ZSM-5 on conversion of methanol to hydrocarbons
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SYSNO ASEP 0372239 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title FTIR and (27)Al MAS NMR analysis of the effect of framework Al- and Si-defects in micro- and micro-mesoporous H-ZSM-5 on conversion of methanol to hydrocarbons Author(s) Sazama, Petr (UFCH-W) RID, ORCID
Wichterlová, Blanka (UFCH-W) RID
Dědeček, Jiří (UFCH-W) RID, ORCID
Tvarůžková, Zdenka (UFCH-W) RID
Musilová, Zuzana (UFCH-W)
Palumbo, L. (IT)
Sklenák, Štěpán (UFCH-W) RID, ORCID, SAI
Gonsiorová, O. (CZ)Source Title Microporous and Mesoporous Materials. - : Elsevier - ISSN 1387-1811
Roč. 143, č. 1 (2011), s. 87-96Number of pages 10 s. Language eng - English Country NL - Netherlands Keywords micro-mesoporous H-ZSM-5 zeolite ; framework defects ; FTIR Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GP203/08/P593 GA ČR - Czech Science Foundation (CSF) IAA400400812 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) IAA400400904 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000291524700013 DOI 10.1016/j.micromeso.2011.02.013 Annotation A series of micro- and micro-mesoporous H-ZSM-5 zeolites with highly regular and, on the other side, a defective framework were prepared by synthesis and post-synthesis treatment, and their activity was investigated in transformation of methanol to low olefins, aromatics and paraffins. (27)Al MAS NMR and FTIR spectroscopy of OH groups and C N groups of adsorbed d(3)-acetonitrile were used for analysis of the population of framework Al- and Si-related defective sites. Beside framework Al atoms in regular Td coordination, perturbed Td coordinated Al atoms and partly extra-framework Al species, and the internal Si-OH groups as Si-related defects were identified. The increase in the concentration of framework Al- and Si-defective sites in microporous H-ZSM-5 was manifested in methanol transformation in the increased yields of aromatics and paraffins, while highly regular framework preferred formation of low C(2) and C(3) olefins. The non-defective micro-mesoporous H-ZSM-5 prepared by alkaline and subsequent oxalic acid leaching of the zeolite with silanols typical for external crystal surface gave substantially longer catalyst life-time. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2012
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