Abstract
The decline in activity of a commercial, supported catalyst has been interpreted using a model of zeolitic micropores uniformly distributed within a network of macropores representing the silica/alumina support. Using this model, simultaneous deactivation by site coverage and pore plugging can be simulated. Changes in network structure due to fouling are monitored by generation of theoretical adsorption isotherms for both fresh and fouled networks. The observed deactivation for catalytic cumene cracking in a plug flow reactor at 500°C was modelled by a series coking mechanism with the coke reducing the macropore radii by approximately 30 Angstrom.
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