Regeneration of a coked Mo-Ni/Al2O3 catalyst in a fixed bed reactor was stu
died. Several kinetic equations treating the coke burn-off reaction as eith
er non-catalytic or catalytic have been tested in simulating the regenerati
on of a coked catalyst in a fixed-bed reactor. A modified grain model using
a kinetic expression given for an Al2O3/SiO2 catalyst acceptably predicted
the temperature rise and residual carbon concentration profiles during the
burn-off reaction, as well as the width of reaction zone, thus indicating
that the reaction is non-catalytic. Kinetic expressions were similarly cons
idered for the coke oxidation reaction with the aim of studying a possible
catalytic effect on the transition metal reaction in the catalyst.