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A review of existing literature on the behaviour of H-, Zn- and Ga-ZSM-5 systems in the aromatisation of propane suggest that no clear picture emerges regarding: (i) the relative merits of zinc and gallium with respect to activity and aromatics selectivity; (ii) the effects of the extent of crystallinity of the zeolitic material on catalysis. The work now reported involves a direct comparative study...
Ammonia adsorption microcalorimetry studies have shown that for ZSM-5-based materials, whose XRD crystallinity was varied from 3 to 70%, the number of strong Brønsted acid sites, that is those with a ΔH ads between 120 and 140kJ/mol, increases with increasing XRD crystallinity. A strong correlation was observed between the catalytic activity of these zeolite-based materials in terms of the...
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