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On the Role of Acidity in Bulk and Nanosheet [T]MFI (T=Al 3+ , Ga 3+ , Fe 3+ , B 3+ ) Zeolites in the Methanol‐to‐Hydrocarbons Reaction
Author(s) -
Meng Lingqian,
Zhu Xiaochun,
Mezari Brahim,
Pestman Robert,
Wannapakdee Wannaruedee,
Hensen Emiel J. M.
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201700916
Subject(s) - catalysis , zeolite , acid strength , brønsted–lowry acid–base theory , chemistry , lewis acids and bases , pyridine , inorganic chemistry , ion exchange , methanol , nuclear chemistry , ion , medicinal chemistry , organic chemistry
The influence of framework substituents (Al 3+ , Ga 3+ , Fe 3+ and B 3+ ) and morphology (bulk vs. nanometer‐sized sheets) of MFI zeolites on the acidity and catalytic performance in the methanol‐to‐hydrocarbons (MTH) reaction was investigated. The Brønsted acid density and strength decreased in the order Al(OH)Si>Ga(OH)Si>Fe(OH)Si≫B(OH)Si. Pyridine 15 N NMR spectra confirmed the differences in the Brønsted and Lewis acid strengths but also provided evidence for site heterogeneity in the Brønsted acid sites. Owing to the lower efficiency with which tervalent ions can be inserted into the zeolite framework, sheet‐like zeolites exhibited lower acidity than bulk zeolites. The sheet‐like Al‐containing MFI zeolite exhibited the greatest longevity as a MTH catalyst, outperforming its bulk [Al]MFI counterpart. Although the lower acidity of bulk [Ga]MFI led to a better catalytic performance than bulk [Al]MFI, the sheet‐like [Ga]MFI sample was found to be nearly inactive owing to lower and heterogeneous Brønsted acidity. All Fe‐ and B‐substituted zeolite samples displayed very low catalytic performance owing to their weak acidity. Based on the product distribution, the MTH reaction was found to be dominated by the olefins‐based catalytic cycle. The small contribution of the aromatics‐based catalytic cycle was larger for bulk zeolite than for sheet‐like zeolite, indicating that shorter residence time of aromatics can explain the lower tendency toward coking and enhanced catalyst longevity.