Abstract
The differential heats of adsorption of ammonia on solid acids were measured, and the surface acid strength distribution and acidity were evaluated. The solid acids studied were silicaalumina, zeolite-containing silica-alumina, sodium-poisoned silica-alumina, alumina and silica. Steam-treatment of these solid acids resulted in a reduction of about 50% in acid density and the disappearance of strong adsorption sites of higher than 120kJ/mol for the heat of adsorption of ammonia. However, it did not affect the positions of the maximum and minimum of the site energy distribution curve. The cumene cracking activity increased linearly with the number of acid sites higher than 70kJ/mol for the heat of adsorption of ammonia. Zeolite-containing silica-alumina showed much higher activity than that of silica-alumina.
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