Heterogeneous Materials for Lean NOx Traps

With increasing Mile Per Gallon (MPG) standards for passenger vehicles in the united states Lean-burn diesel engines are becoming more popular as they represent significant fuel savings relative to traditional stoichiometric engines.  Emissions from lean burn diesel engine exhaust consistent of much higher amounts of NO/NO2 resulting in difficulties meeting NOxregulation standards.  One way to reduce NOx concentrations is through the implementation of a Lean NOxTrap (LNT) catalyst.  It is important to understand the processes of NO oxidation as well as LNT catalyst degradation to effectively implement this type of catalyst in Lean Burn Diesel exhausts.

Our research in this area focusses on synthesis, characterization and testing of heterogeneous catalysts for the oxidation of NO.  The project is conducted in collaboration with Dr. Christopher Depcik in the mechanical engineering department at the University of Kansas.  We are currently investigating the effects of catalyst aging on the effectiveness of supported Pt in LNT catalyst for use in NOx emission reduction in lean burn diesel engine exhausts.  We are also investigating the use of novel supports to facilitate oxygen adsorption and reactivity for NO oxidation to increase the efficiency of LNT catalysts.


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