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Using Adsorption Microcalorimetry for Investigating the Acid Properties of Zeolites and Interpreting their Behaviour as Catalysts and Adsorbents, pp. 173-235 $100.00
Authors:  (Italo Ferino, Vincenzo Solinas - Dipartimento di Scienze Chimiche, Università di Cagliari, Monserrato, Italy)
Abstract:
The use of adsorption microcalorimetry for assessing the acid features of zeolites is
reviewed with reference to the authors’ work on Y, Beta, Mordenite and MCM-22
zeolites. It is shown that, through the simultaneous assessment of the adsorbed amount of
a suitable probe molecule (pyridine or ammonia) and the heat evolved at increasing
coverage, both the quantitative and the energetic features of the surface sites can be
described. Based on thermokinetic data, the mechanism by which the sites are selectively
titrated during sequential exposure of the samples to the probe molecule can also be
individuated. The way of combining microcalorimetric and spectroscopic data for
obtaining information on the nature of the acid sites is also discussed.
It is also shown how calorimetric results, with complementary spectroscopic
information, can serve as a basis for investigating the catalytic and adsorption behaviour
of zeolites. Among the catalytic applications the following cases are presented: the
liquid-phase isopropylation of naphthalene over Y, Beta and Mordenite zeolites; the
vapour-phase isomerisation of 1-methylnaphthalene into 2-methylnaphthalene over Y and
Mordenite catalysts; the vapour- and liquid-phase conversion of sec-butylbenzene over
Beta zeolites. All these cases are worthy of investigation as a way for upgrading low-cost
largely available polynuclear aromatic feedstocks, being also interesting from the
fundamental point of view. Within each case and for each zeolite type, the behaviour of
samples of different Si/Al ratio is presented. The consistency of calorimetric data with
FTIR results is always discussed. The observed complex interplay between the desired
and parasite reactions (also including coking) are explained by considering the combined
influence of the acid properties and the pore structure of the zeolite catalysts. 


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Using Adsorption Microcalorimetry for Investigating the Acid Properties of Zeolites and Interpreting their Behaviour as Catalysts and Adsorbents, pp. 173-235