Study of transient temperature rise during coke burning and effect of coking on effective diffusivity of single zeolite SDX cracking catalyst pellet

This study comprises two sections dealing with separate aspects. First is the major part reports measurement of transient temperature rise during regeneration of coked zeolite SDX catalyst pellet. The pellets were instrumented with fine thermocouple wires with a junction situated at different radial location within the spherical pellets. From thermocouple profiles in the pellet with both position and time could be obtained. The effect initial temperature, oxygen concentration, coke concentration, and flow rate on maximum temperature rise during regeneration has been studied. In the second part, the effect of coke deposition on effective diffusivity of helium/nitrogen mixture in zeolite SDX is measured using the pulse modification of the standard Wicke-Kallenbach technique. Mercury prosimeter and nitrogen adsorption measurement have been used to determine the pore size distribution and micropore surface area of fresh and coked catalysts.