Catalyst for purifying exhaust gases

Details Catalyst for purifying exhaust gases Catalyst for purifying exhaust gases

1975-04-16

1978-07-25

Douglas, A. Winston

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252438, 252440, 252441, 252463, 252466J, 252466PT, 4232135, B01J 3102

Patent

active

041028139

ABSTRACT:
A catalyst for purifying exhaust gases, comprising a carrier composed mainly of active alumina, containing near its surface a component to promote the transformation of active alumina to .alpha.-alumina when said carrier is subjected to a heat treatment in order to make the diameters of the pores near its surface larger than those of the pores in its interior, impregnated with an active catalytic component which permeates further into a portion of the interior deeper than the layer having the alumina transformation-promoting component.

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patent: 3775300 (1973-11-01), Hayes
patent: 3849336 (1974-11-01), Lloyd
patent: 3898183 (1975-08-01), Sugier

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