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2021 CLEERS Virtual Workshop

September 13 - September 17


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

2021 CLEERS Virtual Workshop Agenda

[download agenda as pdf]

Monday, September 13th (all times listed are Eastern Time)

11:00 a.m.Welcome and Introduction
11:05 a.m.Invited Presentation: Continuing Progress Towards 2027 Low NOx Targets – Update on Demonstration Efforts at SwRIChristopher Sharp, Southwest Research Institute
11:55 a.m. Close-coupled SCR: An approach to meet ultra-low NOx requirements for heavy-duty diesel enginesJohn Kasab, AVL Powertrain Engineering Inc.
12:20 p.m.Break
12:50 p.m. Comparative evaluation of ammonium carbamate and UWS based SCR system for diesel engine NOX reduction under WHTCHassan Raza, Korea Institute of machinery and materials (KIMM), South Korea
1:15 p.m. Can a heat exchanger improve the cold-start performance of a PNA–SCR system for NOx abatement?Petr Koci, University of Chemistry and Technology, Prague, Czech Republic
1:40 p.m. Detailed hydrocarbon speciation of GDI cold-start exhaust emissions and use of HC-traps on current light-duty trucksMelanie DeBusk, Oak Ridge National Laboratory
2:05 p.m.Break
2:35 p.m.Panel Discussion: Aftertreatment Catalyst Durability: Information Gaps and Future NeedsTom Pauly, Umicore Autocat USA Inc.
Danan Dou, John Deere
Alissa Recker, Daimler
Christine Lambert, Ford Research & Advanced Engineering
4:15 p.m.End of first day sessions

Tuesday, September 14th (all times listed are Eastern Time)

11:00 a.m.Welcome and Introduction
11:05 a.m.Stuart Daw Memorial Presentation: Novel Structured Low-Temperature Oxidation Catalysts for Future Emission Control ApplicationsEleni Kyriakidou, University at Buffalo
11:55 a.m. Support surface modification induced highly stable precious metal catalyst for efficient CO oxidationFudong Liu, University of Central Florida
12:20 p.m.Break
12:50 p.m. Elucidation of Active Sites for Low-Temperature CO Oxidation over Ceria Supported Copper Catalysts that are 100% regenerable after SO2 poisoning.Carlos Garcia Vargas, Washington State University / EMSL-PNNL
1:15 p.m. Tailoring the Local Environment of Pt in Single-Atom Pt1/CeO2 Catalysts for Robust Low-Temperature CO OxidationDong Jiang, Washington State University
1:40 p.m. Hydrothermally Stable Ceria/Alumina Supports for Exhaust Emission ControlHien Pham, University of New Mexico
2:05 p.m.Break
2:35 p.m. Low temperature automotive exhaust abatement catalysts with high OSC and thermal stabilityDevendra Pakhare, Pyrochem Catalyst Company
3:00 p.m. Exploring the Reactivity of Single Atom Doped MxOy Catalysts for NO reduction in TWC ApplicationsKonstantin Khivantsev, Pacific Northwest National Laboratory
3:25 p.m. Versatile halloysite-supported core@shell nanoparticle for the elimination of automotive exhaust pollutantsWei Jing Li, University of Michigan
3:50 p.m. A Novel, Smaller Honeycomb for Significant PGM SavingMansour Masoudi, Emissol LLC
4:15 p.m.End of second day sessions

Wednesday, September 15th (all times listed are Eastern Time)

11:00 a.m.Welcome and Introduction
11:05 a.m.Invited Presentation: Modeling Emission Catalyst Systems for Gasoline ApplicationsManish Sharma, BASF
11:55 a.m. What Really Matters In Three Way Catalyst Light-off?Andrew (Bean) Getsoian, Ford Motor Company
12:20 p.m.Break
12:50 p.m. Reactivity of Novel High-performance Fuels on a Commercial Three-way Catalyst for SI/ACI Engine Emissions ControlSreshtha Sinha Majumdar, Oak Ridge National Laboratory
1:15 p.m. Methane Oxidation on Structured Pt/Pd + Mixed Metal Oxide Spinel: Mechanistic Origins of Conversion Enhancement During Feed ModulationMichael Harold, University of Houston
1:40 p.m. Exhaust gas after-treatment of hydrogen combustion engines by selective catalytic reduction with hydrogenMichael Borchers, Karlsruhe Institute of Technology
2:05 p.m.Break
2:35 p.m.Poster Session: Lightning Round
3:20 p.m.Break
3:30 p.m.Poster Session: Breakout Rooms
4:15 p.m.End of third day sessions
Poster Breakout Rooms
Selective Catalytic Reduction #1
Clarification of the NOx chemistry and mechanism of NO reduction with ammonia (SCR) on zeolite catalystsKonstantin Khivantsev, Pacific Northwest National Laboratory
Influence of Cu Active Centers in Cu-SSZ-13 on N2O formation during NH3-SCRArthur Shih, Purdue University / Leiden University
Selective Catalytic Reduction #2
How Cu-SSZ-13 Oxidation Activity Affects the Extent of Sulfur PoisoningYu-Ren Chen, University of Virginia
Catalytic Urea Decomposition at Low-temperature for NH3-SCRLai Wei, University of Virginia
Kinetic Modeling of Hydrothermal Aging on Cu-SSZ-13 for NH3-SCRLai Wei, University of Virginia
Insights into the impacts of palladium on the SCR and AMOX performance over Cu/SSZ-13 catalystYiqing Wu, Pacific Northwest National Laboratory
Low Temperature Traps
Understanding the Role of Reaction Conditions and Zeolite Properties on Interconversion Between Cations and Nanoparticles in Pd/ZeolitesKeka Mandal, University of Virginia
Effects of Pd particle size and water pressure on the structural transformation of Pd nanoparticles to mononuclear Pd(II) cations in CHA zeolitesTrevor Lardinois, Purdue University
Three-way Catalysts and Methane Oxidation Catalysts
Approaches to Integrating Catalytic Aerogel Materials into Three-way Catalytic Converters.Bradford Bruno, Union College
Investigating the effects of SO2 on Pt-Pd + Mn0.5Fe2.5O2 spinel dual layer catalysts during lean/rich cycling conditions for emission control in natural gas enginesNatalia Diaz Monrenegro, University of Virginia
Rh catalyst structural changes during CO oxidationSilvia Marino, University of Virginia
Oxidation Catalysts and Systems
Improved Low Temperature CH4 Oxidation over Pd/H-LTA with Si/Al > 8Tala Mon, University at Buffalo
N2O formation due to varying propylene concentrations and catalyst pellet size over a diesel oxidation catalystCarlos Weiler, University of Virginia
An exhaust catalyst simulator (ExhCatSim)Zhiming Gao, Oak Ridge National Laboratory

Thursday, September 16th (all times listed are Eastern Time)

11:00 a.m.Welcome and Introduction
11:05 a.m. Comparison of Pd/LTA and Pd/SSZ-13 as passive NOx adsorbers (PNA)Louise Olsson, Chalmers University of Technology
11:30 a.m. Single atom Ru on CeO2: effective and stable PNA/RNA materialJanos Szanyi, Pacific Northwest National Laboratory
11:55 a.m. Pd-dilution approaches for highly efficient passive NOx adsorbersPranaw Kunal, Oak Ridge National Laboratory
12:20 p.m.Break
12:50 p.m. Analytical Models for Particulate Filter Backpressure PredictionTim Watling, Johnson Matthey
1:15 p.m. Investigation of Diesel Particulate Filter Design Parameters to Improve Filtration Performance under Various Test CyclesZhuqi Wang, NGK Automotive Ceramics USA, INC.
1:40 p.m. Impact of catalyst zoning and permeability on performance of a Diesel Oxidation Catalyst Filter Through Device Scale ModelingKenneth Rappe, Pacific Northwest National Laboratory
2:05 p.m.Break
2:35 p.m. Deactivation modes of Diesel Oxidation CatalystsRama Krishna Dadi, Cummins
3:00 p.m. An efficient solution of developing reduced order models for monolith reactors with dual-layered washcoat and micro kineticsMingjie Tu, University of Houston
3:25 p.m. Urea water solution selective catalyst reduction mixer multi-objective optimizationMihai Chiruta, Cummins Emission Solutions
3:50 p.m.End of fourth day sessions

Friday, September 17th (all times listed are Eastern Time)

11:00 a.m.Welcome and Introduction
11:05 a.m.Invited Presentation: The Reduction Half Cycle in the Low-T NH3-SCR of NOx over Cu-CHA Catalysts: Transient Kinetic Analysis and Mechanistic StudyEnrico Tronconi, Politecnico di Milano
11:55 a.m. Temperature Dependence of Oxidation and Reduction Kinetics during NOx Selective Catalytic Reduction with NH3 on Cu-Chabazite ZeolitesSiddarth Krishna, Davidson School of Chemical Engineering, Purdue University
12:20 p.m.Break
12:50 p.m. Development of coupled models for NH3 capacity and SCR on Cu-SSZ-13 at various aging conditions and temperaturesAustin Ladshaw, Oak Ridge National Laboratory
1:15 p.m. Multi-scale modeling approach to the nature of active sites for a vanadium-based SCR catalyst: NH3 AdsorptionAndres Felipe Suarez Corredor, Scania CV AB / Chalmers University of Technology
1:40 p.m. A Comparative Study between Real-world and Accelerated Lab Aging of Cu/SSZ-13 SCR CatalystsFeng Gao, PNNL
2:05 p.m.Break
2:35 p.m. Impact of Field Aging on the Redox Half Cycles of NH3-Selective Catalytic NOx Reduction over a Commercial Cu-SSZ-13 Monolith CatalystDhruba Jyoti Deka, Oak Ridge National Laboratory
3:00 p.m. Kinetic model for NH3 solvation, reduction and re-oxidation of active Copper sites in Cu-SSZ-13Rohil Daya, Cummins Inc.
3:25 p.m. Aging of Cu-exchanged Zeolite SCR Catalysts Under Lean, Stoichiometric, and Rich Gas Compositions Relevant to Gasoline ApplicationsCalvin Thomas, Oak Ridge National Laboratory
3:50 p.m. The role of the oxide component in hybrid ceria-manganese oxide–Cu-SSZ-13 catalysts in low-temperature selective catalytic reduction of NOx by ammonia via transient experimentsTahrizi Andana, Pacific Northwest National Laboratory
4:15 p.m.End of fifth day sessions

The 2021 CLEERS Workshop will be held September 13-17, 2021 as a virtual event.  The Workshop will be hosted on the Zoom virtual platform.  Each talk will be presented live via a Zoom meeting at the designated time listed on the Workshop agenda. Instructions on connecting to the Zoom meeting will be emailed to the address provided during registration.

For any questions related to the Workshop, send email to the 2021 CLEERS Workshop Organizing Committee (workshop2021@cleers.org).

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


September 13
September 17
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