Abstract
In order to follow coke burning on a Pt-Re/Al 2O 3 catalyst commercially coked, several experiments in a bench scale equipment with an isothermically-operated reactor were made. The influence of the operating temperature, pressure, and flow rate on CO 2 concentration in the outlet gas was studied. Comparing the results and photographs of the radial coke distribution during the burning, a model stating the presence of several types of coke with different degrees of polymerization was proposed. Experiments in a Differential Thermal Analysis equipment were carried out in order to determine operating conditions under which the ignition of coke burning reactions takes place. It was found that the exothermicity of combustion of the hydrogen adsorbed on the metal is important in initiating the coke burn-off.
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