Catalyst for the combustion of diesel soot, methods for making the catalyst and methods of using the catalyst
AssigneeDelphi Technologies, Inc.
InventorWenzhong Zhang
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Abstract
A catalyst composition is disclosed for the reduction of soot and undesirable gaseous emissions from engine exhaust, particularly exhaust from diesel engines. The catalyst contains an alkali metal catalytic metal oxide, preferably lithium platinum oxide, in which the catalytic metal is atomically isolated. For improved performance in a diesel particulate filter, the alkali catalytic metal oxide is uniformly dispersed on an alkali metal aluminate such as lithium aluminate. Also disclosed is the catalytic device comprising this catalyst.
Claims12
A method for preparing a catalyst composition comprising:
- combining a precursor of an alkali metal aluminate and a catalytic metal salt to form a mixture;
- and
- calcining the mixture to form an alkali metal aluminate comprising a substantially uniformly dispersed alkali metal catalytic metal oxide.
A catalytic element, comprising:
- a substrate comprising an alkali metal catalytic metal oxide substantially uniformly dispersed in an alkali metal aluminate.
A process for treating diesel soot, comprising:
- contacting the soot with an alkali metal aluminate comprising a substantially uniformly dispersed alkali metal catalytic metal oxide.
Dependencies are inferred from the claim text.