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2021 CLEERS Virtual Workshop

September 13 - September 17

The 2021 CLEERS Workshop will be held on September 13-17, 2021 as a virtual event in a similar format as last year.   We will send updated information as it becomes available.


CLEERS Workshops are annual meetings open to all those who are interested in understanding and simulating the performance of exhaust emission control devices under realistic operating conditions. The Workshops provide an informal, focused forum to:

  • share recent experimental and computational simulation experience with advanced aftertreatment technologies;
  • enhance emissions control research collaborations among industry, universities, and DOE national laboratories; and
  • identify the most pressing pre-competitive research priorities for emissions control.

CLEERS Workshops feature invited presentations by internationally prominent researchers and a moderated discussion with an invited panel of industry experts.

Workshop participants are encouraged to contribute oral presentations and posters on the following (or related) technologies and topics.

Topic Areas

  • Passive NOx adsorbers (PNA)
  • Hydrocarbon traps
  • Selective catalytic reduction (SCR) of NOx by urea/ammonia
  • Oxidation catalysts (DOC, MOC, etc.)
  • Three-way catalysts (TWC)
  • Diesel and gasoline particulate filters (DPF, GPF)
  • Selective catalytic reduction of NOx by hydrocarbons (HC SCR)
  • Ammonia slip catalysts (ASC)


  • Identification of reaction mechanisms (from micro-kinetic through global) and kinetic parameters
  • Modeling strategies for improved accuracy and/or reduced computation time
  • Drive cycle simulations of advanced vehicle/emissions control systems
  • Formulation, evaluation, and simulation of catalysts with lower operating temperatures
  • Multifunctional aftertreatment devices: catalyst coated filters, layered/zoned washcoats
  • Integration of engines and emissions controls
  • Durability
  • Reductant (urea or fuel) delivery: spray modeling, decomposition processes, deposit formation
  • Measurement of engine-out emissions
  • Real-world emissions
  • Thermal management technologies and strategies
  • Effects of net-zero carbon fuels on engine emissions and catalyst performance
Workshop Dates:September 13-17, 2021
Deadline to submit contributed presentation and poster abstracts:May 17, 2021
Extended deadline to submit contributed presentation and poster abstracts:May 31, 2021
Authors notified of abstract acceptance:July 16, 2021
Registration Deadline:August 31, 2021
Author Resources

Abstract Submission Deadline Extended to May 31, 2021

Submit Abstract


September 13
September 17
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