Article

Catalysis Letters

, Volume 125, Issue 3, pp 229-235

First online:

Spatially-Resolved Calorimetry: Using IR Thermography to Measure Temperature and Trapped NOX Distributions on a NOX Adsorber Catalyst

  • Khurram AftabAffiliated withDepartment of Chemical Engineering, University of Waterloo
  • , Jasdeep MandurAffiliated withDepartment of Chemical Engineering, University of Waterloo
  • , Hector BudmanAffiliated withDepartment of Chemical Engineering, University of Waterloo
  • , Neal W. CurrierAffiliated withCummins Inc., MC 50321
  • , Aleksey YezeretsAffiliated withCummins Inc., MC 50321
  • , William S. EplingAffiliated withDepartment of Chemical Engineering, University of Waterloo Email author 

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Abstract

Spatial- and time-resolved temperature distributions over a Pt/Ba/Al2O3 model NOX storage/reduction (NSR) catalyst were measured using infra-red thermography. The heat generated during regeneration was correlated to surface nitrate reduction, thereby revealing the concentration of surface nitrates at specific locations along the catalyst. The results demonstrate that there is more nitrate formation at upstream positions relative to downstream, or from front to back of the catalyst, with short trapping times. However, as more NOX was trapped on the catalyst during longer trapping times, it was found that the largest amount of NOX was trapped slightly downstream of the inlet, evolving to a local maximum in amount trapped. Applying infrared (IR) thermography to this system resulted in a spatially resolved calorimetry method via the correlation of temperature to the distribution of sorbed nitrate species along the catalyst.

Keywords

NOX storage NOX reduction Lean NOX traps Infra-red thermography Vehicle emissions Spatially resolved calorimetry