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US 9,427,732 B2Granted
Catalyst design for heavy-duty diesel combustion engines
AssigneeSDCmaterials, Inc.
InventorsQinghua Yin, Xiwang Qi, Maximilian A. Biberger
Life of this patent
Estimating the term…
Abstract
Disclosed are washcoats, coated substrates formed from such washcoats, and catalytic converters for use in diesel applications, such as heavy duty diesel applications. Methods of preparing the coated substrates are also disclosed.
Claims24
A coated substrate comprising:
- a substrate;
- a first washcoat layer comprising:
- boehmite particles;
- and
- a first catalytically active material comprising platinum and palladium in a weight ratio of 10:1 platinum:palladium to 100:1 platinum:palladium, or comprising platinum and no palladium;
- and
- a second washcoat layer comprising:
- boehmite particles;
- and
- a second catalytically active material comprising:
- i. platinum and palladium in a weight ratio of 1:2 platinum:palladium to 8:1 platinum:palladium;
- ii. two or more catalytically active materials which together comprise platinum and palladium in a weight ratio of 1:2 platinum:palladium to 8:1 platinum:palladium;
- or
- iii. palladium and no platinum.
11 more elements
A coated substrate comprising:
- a substrate;
- and
- a washcoat layer comprising:
- boehmite particles;
- a first catalytically active material comprising platinum and palladium in a weight ratio of 10:1 platinum:palladium to 100:1 platinum:palladium, or comprising platinum and no palladium;
- and
- a second catalytically active material comprising platinum and palladium in a weight ratio of 1:2 platinum:palladium to 8:1 platinum:palladium, or comprising palladium and no platinum.
4 more elements
A method of forming a coated substrate comprising coating a substrate with a washcoat layer comprising:
- boehmite particles;
- a first catalytically active material comprising platinum and palladium in a weight ratio of 10:1 platinum:palladium to 100:1 platinum:palladium, or comprising platinum and no palladium;
- and
- a second catalytically active material comprising platinum and palladium in a weight ratio of 1:2 platinum:palladium to 8:1 platinum:palladium, or comprising palladium and no platinum.
1 more element
A method of forming a coated substrate comprising, in either order:
- coating a substrate with a first washcoat layer comprising:
- boehmite particles;
- and
- a first catalytically active material comprising platinum and palladium in a weight ratio of 10:1 platinum:palladium to 100:1 platinum:palladium, or comprising platinum and no palladium;
- and
- coating the substrate with a second washcoat layer comprising:
- boehmite particles;
- and
- a second catalytically active material comprising platinum and palladium in a weight ratio of 1:2 platinum:palladium to 8:1 platinum:palladium, or comprising palladium and no platinum.
6 more elements
Dependencies are inferred from the claim text.