Durability of an UF HC Trap/SCR Catalyst System Applied to a 4-Cylinder PZEV Calibrated Vehicle Umicore Autocat USA Incorporated

Format:

Conference/Event

Author/Creator:

Moser, Moser, author.

Contributor:

Alltizer, Chad

Ball, Douglas

Nipunage, Sanket

Nunan, John

Conference Name:

WCX World Congress Experience (2018-04-10 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2018

Summary:

A 1.0L underfloor converter of a 1.4L PZEV calibrated vehicle was replaced with a 1.26L HC trap and a 1.26L SCR catalyst. The HC trap consisted of a zeolitic storage layer beneath a three-way catalyst layer. A newly developed catalyzed HC trap technology containing Pd/Rh was used in the current study. Increased trapping efficiency and conversion was assigned to rapid and efficient polymerization of small alkenes and aromatics coupled with more efficient combustion before release. The new trap features include the presence of strong Brønsted acidity, precious metals such as Pd and a base Mn+ redox active metal. The HC trap was followed by an SCR catalyst for NOx clean-up. The production close-coupled catalyst and replacement underfloor catalysts (HC trap and SCR) were aged on a combination of rural and highway roads for 150,000miles. Peak bed temperatures during road aging of the HC Trap and SCR catalyst were approximately 600°C. Vehicle FTP and US-06 tests were conducted at 9 intervals between 2,000 and 150,000miles. In general, the FTP emissions did not change significantly with mileage. At 150,000miles, FTP nMHC and NOx emissions were 6 and 22mg's/mile, respectively. At 150,000miles, the HC Trap reduced HC and NOx emissions by 6 and 19mg/mile, respectively. US-06 nMHC + NOx emissions were consistently below 10mg/mile. Due to the effectiveness of the HC trap on this application, the SCR had no significant impact on HC emissions, and a small benefit for NOx

Notes:

Vendor supplied data

Publisher Number:

2018-01-0336

Access Restriction:

Restricted for use by site license