Method for application of porous wash coats to low porosity refr

Details Method for application of porous wash coats to low porosity refr Method for application of porous wash coats to low porosity refr

1975-03-27

1980-04-22

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252463, 252477R, B01J 2900, B01J 2308

Patent

active

041994779

ABSTRACT:
The method for obtaining a tightly adherent, uniformly dispersed porous wash coat by the use of dilute aqueous hydrofluoric acid, 1-5% HF, as an etchant for refractory low porosity catalytic monolith supports to produce substantial improvement of the adhesion, dispersion and uptake characteristics of such supports for porous wash coats. The application of an ultrasonic energy field to the etchant bath greatly accelerates the etching process.

REFERENCES:
patent: 2903434 (1959-09-01), Gloss et al.
patent: 2967185 (1961-01-01), Becker et al.
patent: 3416975 (1968-12-01), Pollack et al.
patent: 3839224 (1974-10-01), Yonehara et al.
patent: 3856706 (1974-12-01), Harrison et al.

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