engleski

Impurity poisoning of Ni-catalyst pellet

The problem of decrease in catalyst activity due an irreversible adsorption of poison was solved numerically using a single point collocation approximation. The numerical results are compared with experimental data obtained by measuring concentration changes due to thiophene poisoning of Ni/Al2O3 in benzene hydrogenation. The kinetic experiments, activity tests, and poisonning experiments were measured in a series of differential reactor experiments at atmospheric total pressure at temperature 403, 427 and 448 K. It was found that the impurity poisoning concentration of benzene and thiophene decreases from a maximum value at the surface to the centre. This is reflected in the residual activity profile which has a maximum at the centre of the pellet. It also was found that there is satisfactory degree of correlation between calculated effectivenes factor and obtained with experimental obsertvation.

impurity poisoning, concentration profile, matematical model of deactivation, effectivenes factor

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