SCR Deactivation Kinetics for Model-Based Control and Accelerated Aging Applications Southwest Research Institute

Format:

Conference/Event

Author/Creator:

Bartley, Bartley, author.

Contributor:

Chadwell, Christopher J.

Kostek, Theodore M.

Zhan, Reggie

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Selective Catalytic Reduction (SCR) catalysts are used to reduceNOx emissions from internal combustion engines in avariety of applications. Southwest Research Institute (SwRI)performed an Internal Research and Development project to studySCR catalyst thermal deactivation. The study included a V/W/TiO₂formulation, a Cu-zeolite formulation and a Fe-zeolite formulation.This work describes NH₃ storage capacity measurement data as afunction of aging time and temperature. Addressing one objective ofthe work, these data can be used in model-based control algorithmsto calculate the current NH₃ storage capacity of an SCR catalystoperating in the field, based on time and temperature history. Themodel-based control then uses the calculated value for effectiveDEF control and prevention of excessive NH₃ slip. Addressing asecond objective of the work, accelerated thermal aging of SCRcatalysts may be achieved by elevating temperatures above normaloperating temperatures. Time and temperature correlations use theArrhenius equation, which requires a formulation-specificdeactivation energy value (Ed). The NH₃ storage capacity datagenerated in this work were used to calculate an Ed value for eachof the three SCR catalyst formulations

Notes:

Vendor supplied data

Publisher Number:

2012-01-1077

Access Restriction:

Restricted for use by site license