4 years ago

Impact of Crystal Size on the Acidity and the Involved Interactions Studied by Conventional and Innovative Techniques

Impact of Crystal Size on the Acidity and the Involved Interactions Studied by Conventional and Innovative Techniques
T. Jean Daou, M. Amine Benghalem, Thomas Belin, Ludovic Pinard, Jean-Dominique Comparot, Amir Astafan
A series of β-zeolites with different sizes have been synthesized. Their size range from 10 μm to a few nanometers. The acidity measurement (i.e number, strength and location) were carried out by so-called conventional techniques: adsorption followed by infrared spectroscopy of various basic probe molecules (CO, C2H4, pyridine) and model reaction (n-hexane cracking). The extreme crystal downsize lowers the acid strength. These results are confirmed also by using an innovative technique: the reversed-flow inverse chromatography (RF-IGC). The involvement of the external and internal zeolitic species depend on the adsorbed molecules and the operating conditions: (i) the high content of extra-framework aluminum enhance the n-hexane cracking activity owing to the exaltation of the Brønsted sites strength, and (ii) the RF-IGC technique show an important involvement of the silanol groups (mainly present on the nanosized zeolite) in lateral interactions with ethylene.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b06093

DOI: 10.1021/acs.jpcc.7b06093

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