Exhaust Aftertreatment for Diesel Engines

EPA Grant Number: FP916411
Title: Exhaust Aftertreatment for Diesel Engines
Investigators: Pihl, Josh A.
Institution: University of Wisconsin - Madison
EPA Project Officer: Lee, Sonja
Project Period: January 1, 2004 through December 31, 2006
Project Amount: $111,172
RFA: STAR Graduate Fellowships (2004) RFA Text |  Recipients Lists
Research Category: Academic Fellowships , Fellowship - Environmental Engineering , Engineering and Environmental Chemistry


The objective of this research is to develop a better understanding of the fundamental chemical processes occurring inside a diesel particulate filter coated with a lean NOx trapping catalyst under real exhaust gas conditions. This knowledge should aid in developing more effective and robust exhaust aftertreatment systems for diesel engines.


A computational model of the chemical reactions, filtration mechanisms, fluid mechanics, and heat transfer occurring inside the NOx trapping filter under both lean and rich exhaust operating conditions is being developed. I also am working with filter and catalyst manufacturers to design a novel aftertreatment device configuration that will allow for spatially resolved sampling of the exhaust gas inside the filter during operation. This filter will be integrated into the exhaust system of a diesel engine and tested by collaborators at the University of Wisconsin Engine Research Center. The engine is heavily instrumented for exhaust gas analysis, including FT-IR for determination of chemical composition, SPMS and TEOM for particulate matter (PM) size and concentration analysis, and a battery of filters used for chemical characterization of the PM. The data from the engine laboratory tests will be used to validate the computational model. Additional offline testing of the coated filter material also will be performed to quantify the chemical reaction kinetics and evaluate some of the parameters needed in the computational model. After validation is complete, the model will be run through a series of simulations to probe the effects of different exhaust gas variables on operation of the aftertreatment device.

Supplemental Keywords:

fellowship, aftertreatment, diesel engines, exhaust systems, exhaust aftertreatment, NOx trapping filter, exhaust gas analysis, computational model,, Scientific Discipline, Air, Air Pollution Monitoring, Environmental Chemistry, mobile sources, Environmental Engineering, monitoring, engine exhaust, NOx trapping catalyst, exhaust aftertreatment, vehicle emissions, motor vehicle emissions, diesel engines, automotive emissions, automotive exhaust, diesel exhaust, emissions analyzer, particle trap, ambient particle pollution

Relevant Websites:

2004 STAR Graduate Fellowship Conference Poster (PDF, 1p., 141KB, about PDF)

Progress and Final Reports:

  • 2004
  • 2005
  • Final