Cu/Zeolite SCR on High Porosity Filters: Laboratory and Engine Performance Evaluations
Date Published: 2009-04-20
Paper Number:2009-01-0897
DOI: 10.4271/2009-01-0897
Citation:
Cavataio, G., Girard, J., and Lambert, C., "Cu/Zeolite SCR on High Porosity Filters: Laboratory and Engine Performance Evaluations," SAE Technical Paper 2009-01-0897, 2009, doi:10.4271/2009-01-0897.
Selective catalytic reduction (SCR) is expected to be used extensively in the U.S. for diesel vehicle NOx control. Much progress has been made on improving performance and reducing complexity of SCR systems for vehicles in the past several years. SCR system complexity can be reduced further by implementation of SCR-coated diesel particulate filters (SCRFs). In this system, a high porosity (> 50%) filter substrate is coated with an SCR formulation, ideally in the pores of the filter walls, so that the DPF and SCR functions can be combined into a single catalyst.
Two state-of-the-art Cu/zeolite SCR formulations and three types of high porosity filter substrates were included in this study. Laboratory and engine-dynamometer tests were performed to measure NOx conversion under a variety of conditions to assess the impact of ammonia oxidation, inlet NO
2
/NOx ratio, ammonia/NOx ratio, oxygen level, space velocity, soot loading, and ammonia loading level. In general, SCRF technology was found to perform similarly to traditional channel-flow catalysts with the same type of active materials.
Purchase more technical papers and save! With TechSelect,
you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
Learn more >
