ASC with platinum group metal in multiple layers

An emissions treatment system comprising:

• a. a diesel engine emitting an exhaust stream including particulate matter, NOx, and carbon monoxide;
• b. an SCR catalyst;
• c. a catalytic article comprising:
• i. a substrate having an inlet end and an outlet end defining an axial length;
• ii. a first catalyst coating including:
• 1) a platinum group metal distributed on a molecular sieve, and 2) a base metal distributed on a molecular sieve;
• iii. a second catalyst coating including:
• 1) a platinum group metal distributed on a molecular sieve, and 2) a base metal distributed on a molecular sieve;
• the catalytic article located downstream of the SCR catalyst,
• wherein the SCR catalyst and the ASC catalyst are located on a single substrate, and the SCR catalyst is located on an inlet side of the substrate and the ASC catalyst is located on the outlet side of the substrate.

A catalytic article for treating an exhaust gas stream containing particulate matter, hydrocarbons, CO, and ammonia, the article comprising:

• a. a substrate having an inlet end and an outlet end defining an axial length;
• b. a first catalyst coating including:
• 1) a platinum group metal distributed on a molecular sieve, and 2) a base metal distributed on a molecular sieve;
• c. a second catalyst coating including:
• 1) a platinum group metal distributed on a molecular sieve, and 2) a base metal distributed on a molecular sieve,
• wherein
• a. the first catalyst coating extends from the outlet end toward the inlet end, covering less than the entire axial length of the substrate;
• and
• b. the second catalyst coating covers the entire axial length of the substrate and overlaps the first catalyst coating.

A catalytic article for treating an exhaust gas stream containing particulate matter, hydrocarbons, CO, and ammonia, the article comprising:

• a. a substrate having an inlet end and an outlet end defining an axial length;
• b. a first catalyst coating including:
• 1) a platinum group metal distributed on a molecular sieve, and 2) a base metal distributed on a molecular sieve;
• c. a second catalyst coating including:
• 1) a platinum group metal distributed on a molecular sieve, and 2) a base metal distributed on a molecular sieve,
• wherein
• a. the first catalyst coating covers the entire axial length of the substrate;
• and
• b. the second catalyst coating extends from the inlet end toward the outlet end, covering less than the entire axial length of the substrate and overlapping a portion of the first catalyst coating.