Process for preparing ultra-stable, high surface area alpha-alum

Details Process for preparing ultra-stable, high surface area alpha-alum Process for preparing ultra-stable, high surface area alpha-alum

1978-07-25

1979-10-02

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252463, 208123, 208124, C01F 702

Patent

active

041698835

ABSTRACT:
The preparation of an ultra-stable, high surface area alpha-alumina catalyst and catalyst support suitable for use in high temperature processes such as petroleum refining processes, e.g., resid cat cracking and steam reforming, is disclosed. The process comprises impregnating high surface area gamma-alumina having narrow pores with a carbonaceous material that readily chars to form carbon. The impregnated alumina is then heated to a temperature sufficient to induce charring, following which the gamma-alumina is converted to alpha-alumina by further heating. The carbon is subsequently removed by oxidation. The alpha-alumina thus produced can withstand temperatures up to at least about 1000.degree. C. in the presence of steam without substantial loss of surface area.

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patent: 4012337 (1977-03-01), Mitchell
patent: 4032433 (1977-06-01), Petri et al.

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