Abstract
A new method for estimating catalytic activity from the acid strength distribution curve is presented for solid acid catalysts such as silica alumina. The method assumes that the Bro¨nsted catalysis law and the compensation effect hold for the rate processes on acid sites of different acid strengths. The basic equations are similar to those developed by Yoneda. The cracking of cumene over silica alumina catalysts with different acidic properties was performed in the temperature range from 673 to 773 K. The acid strength (H O) distribution curves of the catalysts were measured in the range from -3 to the strongest acid strength by the indicator adsorption method developed by the authors. These curves enabled us to evaluate the relationship between the acidic properties and the activity of the catalyst. The intrinsic reaction rate on an acid site increased with the increase in its acid strength. The overall reaction rates for cracking cumene over silica alumina catalysts could be estimated by using the profile of the intrinsic reaction rate constant against acid strength, and the acid strength distribution curves.
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