Selective catalysts having high temperature alumina supports for naphtha hydrodesulfurization

摘要

This invention relates to a catalyst and method for hydrodesulfurizing naphtha. More particularly, a Co/Mo metal hydrogenation component is loaded on a high temperature alumina support in the presence of a dispersion aid to produce a catalyst that is then used for hydrodesulfurizing naphtha. The high temperature alumina support has a defined surface area that minimizes olefin saturation.

主权项

1. A method for the hydrodesulfurization (HDS) of a naphtha having an olefin content of at least about 5 wt. %, based on the weight of the naphtha comprising:
contacting the naphtha with a sulfided HDS catalyst under hydrodesulfurization conditions, wherein the catalyst is prepared by: (i) heating an alumina precursor to a temperature above at least about 800° C. to form a high temperature alumina, impregnating the high temperature alumina with an aqueous solution of (a) a cobalt salt, (b) a molybdenum salt, and (c) at least one organic additive which is an organic ligand containing oxygen and/or nitrogen atoms, to form an impregnated high temperature alumina, provided that the high temperature alumina has a gamma, eta and chi alumina content less than 30 wt. %, based on the total weight of the alumina; a median pore diameter in the range of about 100 Å to about 1000 Å; and a surface area between about 40 m2/g and about 200 m2/g; (ii) drying the impregnated high temperature alumina at temperatures less than about 200° C. to form a dried impregnated high temperature alumina catalyst precursor; and (iii) sulfiding the dried impregnated high temperature alumina catalyst precursor to form the sulfided HDS catalyst, provided that the HDS catalyst or catalyst precursor is not calcined prior to sulfiding or use as the sulfided HDS catalyst in the method.