Process of making catalysts and catalysts made by the process

Details Process of making catalysts and catalysts made by the process Process of making catalysts and catalysts made by the process

1990-05-04

1991-07-30

Shine, W. J.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502305, 502321, 502325, 502335, 502337, 502338, 502350, 502353, 502354, B01J 2106, B01J 2322, B01J 2324, B01J 2374

Patent

active

050360370

ABSTRACT:
Process for producing catalysts for use within hydrogenation, oxidation, dehydration or dehydrogenation processes comprising oxides, in pure or mixed form, or being applied as mixed crystal systems, made of nickel, cobalt and molybdenum, vanadium, tungsten, titanium and chromium, starting with their corresponding aqueous solutions of their respective chlorides, fluorides or nitrates, which afterwards are processed within a pyrohydrolysis plant to gain the oxide powders, of typical specific surfaces areas of 1 to 100 m.sup.2 /g, agglomerate sizes of 1 to 500 microns and mean particle sizes of 20 to 30 microns. The corresponding anions of these salt solutions are transformed during pyrohydrolysis into their respective acids, which can be regained by absorptive means and which thereafter can be returned to a chemical dissolving process to make the salts and solutions for the pyrohydrolysis, which means an economic advantage. A further process comprises the prereduction of these spray roasted oxide powders at high temperatures, up to a maximum of 800.degree. C. The catalytically active constituents also can be made by this process by an in-situ precipitation on an inactive carrier, such as alumina, titaniumdioxide, phosphorpentoxide or also silicates. A further ceramic processing of such spray roasted powders into ceramic parts (pellets, balls, etc.) is possible.

REFERENCES:
patent: 3677975 (1972-07-01), Bennett et al.
patent: 4146504 (1979-03-01), Deffeyes
patent: 4661468 (1987-04-01), Lee et al.

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