Revisiting Acidity of SnBEA Catalysts by Combined Application of FTIR Spectroscopy of Different Probe Moleculesстатья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 12 июля 2017 г.

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[1] Sushkevich V. L., Ivanova I. I., Yakimov A. V. Revisiting acidity of snbea catalysts by combined application of ftir spectroscopy of different probe molecules // Journal of Physical Chemistry C. — 2017. — Vol. 121. — P. 11437–11447. The Lewis and Brønsted acid properties of SnBEA zeolites as well as SnO2 supported on silica BEA have been examined by means of IR spectroscopy of adsorbed pyridine, 2,6-ditertbutylpyridine and deuterated acetonitrile. Three types of surface sites have been detected and assigned to: i) framework Sn centers possessing Lewis acid properties; ii) weak Brønsted acid sites associated with framework tin atoms and iii) non-framework SnO2 particles which possess Lewis acidity. The total amount of Lewis sites can be determined using pyridine as a probe molecule, while the type of Lewis sites can be distinguished by FTIR of adsorbed acetonitrile. The band at 2316 cm-1 is attributed to strong framework sites, whereas the band at 2287 cm-1 – to non-framework sites. Brønsted acid sites can be characterized using 2,6-ditertbutylpyridine (bands at 3363, 1613 and 1530 cm-1) and deuterated acetonitrile (band at 2308 cm-1). The relative amount of Lewis and Brønsted acid sites on SnBEA can be varied by treatment in hydrogen at different temperatures. [ DOI ]

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