Preparation of catalysts of predetermined pore size distribution

Details Preparation of catalysts of predetermined pore size distribution Preparation of catalysts of predetermined pore size distribution

1977-12-27

1979-03-20

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252463, 252466J, 252466PT, B01J 2104, B01J 2324, B01J 2340, B01J 2374

Patent

active

041453166

ABSTRACT:
A process for the treatment of a hydrogel by contact thereof with an aqueous solution containing from about 0.1 to 20 percent, by weight, of a water soluble mono- or polycarboxylic acid, preferably one which contains from 1 to about 12 carbon atoms, and more preferably from about 2 to about 8 carbon atoms. Suitably, the acid treatment can be incorporated with a wash step which removes the sulfates and other soluble salts, as well as the bayerite, or the acid treatment can be employed subsequent to a wash step, prior to, or simultaneously with a pore volume extending step. The hydrogel can thus be subsequently contacted and separately treated with the acid-containing aqueous solution to remove the bayerite, or the acid can be dissolved in a solution which also contains certain critical amounts of specified type of water soluble polymer in a pore volume extending step.

REFERENCES:
patent: 4016108 (1977-04-01), Robson

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