The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 1978
Filed:
Sep. 24, 1975
Paul W Tamm, Greenbrae, CA (US);
Chevron Research Company, San Francisco, CA (US);
Abstract
Heavy oil feedstocks containing at least 20 ppm metals, particularly residuum feedstocks, are hydrodesulfurized using a catalyst prepared by impregnating Group VIb and Group VIII metals or metal compounds into a support comprising alumina wherein the support has at least 70 volume percent of its pore volume in pores having a diameter between 80 and 150 Angstroms and less than 3 volume percent of its pore volume in pores having a diameter above 1000 Angstroms. The catalyst preferably has at least 80 volume percent of its pore volume in pores having a diameter between 80 and 150 Angstroms and less than 1.5 volume percent of its pore volume in pores having a diameter above 1000 Angstroms. An especially outstanding hydrodesulfurization catalyst in terms of very low deactivation rate is attained by using an alumina support of the above pore size distribution or the above preferred pore size distribution and wherein the metals are impregnated into the catalyst in a single step impregnation using a solution of a cobalt or nickel salt and a heteropolymolybdic acid such as phosphomolybdic acid.