Abstract
The acidity of alkaline-earth mordenites, as observed by the ir spectra of adsorbed pyridine, has been correlated with their activity as catalysts for n-butane decomposition. The results indicate that Brønsted acid sites are the origin of the catalytic activity. However, the presence of Lewis acid sites is necessary for the reaction to take place, suggesting an inductive effect of these sites on the Brønsted sites. The presence of alkaline-earth cations in decationated mordenites decreases the activity of the original sample; this influence increases with decreasing ionic radius. This result is interpreted as a weakening of the inductive effect produced by the structural Lewis sites through a fall in their number by the cation exchange process. The reactant molecules are coordinatively bound to the cations to an extent which is strongly dependent on their electrostatic field, thus influencing the accessibility of the Brønsted sites.
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