Studies of deactivation mechanism for the commercial Ni–Mo–P/Al2O3 catalysts in naphtha hydrogenation and hydrodesulfurization

The feedstock of naphtha hydrogenation apparatus, anti-scorching agent of the visbreaking unit and antifoam agent of the coking apparatus have been underway the analysis, and hydrogenation technology was studied in laboratory. According to the lab research and the analytic test results of catalysts that unloaded from commercial plant, we know that little organosilicon in the stock oil became free silicon under hydrogenation condition, and deposited on the reaction pore passage of the hydrogenation catalysts, causing perpetual deactivation of the hydrogenation catalysts.