Process for catalyst preparation for the hydrodemetallization of

Details Process for catalyst preparation for the hydrodemetallization of Process for catalyst preparation for the hydrodemetallization of

1983-02-23

1985-06-25

Gantz, D. E.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502322, 502306, 502307, 502355, 502439, 208216PP, 208251H, B01J 2326, B01J 2328

Patent

active

045254729

ABSTRACT:
A catalyst for the hydrotreatment of heavy crudes and residues and a method for the preparation thereof are claimed, specifying an amount of Group VIb metallic hydrogenation compound irreversibly absorbed by the silica or alumina extruded support structure surface to be between 0.5 and 3% of the dried and calcined catalyst by weight. The percentage limit on the hydrogenation compound can be achieved by either obtaining a dense alumina support structure having a novel pore diameter distribution, or treating a prior art support with an absorption site restricter such as MgO prior to hydrogenation compound impregnation. Subsequent fabrication steps comprise washing, drying, calcining and presulfurizing. The resultant catalyst has a monolayer of hydrogenating compound deposited on the reaction surface, and interfering compounds such as massive MoO.sub.3, Al(MoO.sub.4).sub.3 or polymolybdates are not formed. The unimetallic catalyst is demonstrated to be comparable or superior to a bimetallic catalyst employing five times as much hydrogenating metal, and has superior service life due to uniform metal contaminant deposition throughout the catalyst interior.

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