The annual CLEERS conference sponsored by the U.S. Department of Energy and organized by the Oak Ridge National Laboratory was held in Ann Arbor, MI, 18–20 September 2018. It brought together emission control scientists, engineers, and investigators from academia, national labs, and industry from across the U.S. and abroad, discussing the latest emission control technologies, trends, challenges, and regulations. Presentations, deliberations, exchanges, and panel discussions displayed a much-needed focus on the latest up-and-coming approaches to further advance NOx reduction, a major remaining challenge especially in diesel emission control, using further advances in selective catalytic reduction (SCR) of NOx, passive NOx adsorbers, lean NOx traps, and SCR on particulate filter, amongst others. Discussions were further held on diesel oxidation catalysts, gasoline particulate filters, three-way catalysts, and hydrocarbon SCR, and also on the latest catalyst washcoat technologies, materials, and catalytic processes such as diffusion and kinetics, testing, and computer simulations.
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Beta polymorph A—one of various zeolite types
Chabazite—one of various zeolite types, also SSZ-13 (a synthetic type of CHA)
Density functional theory
Diesel oxidation catalyst
Fuel blended with 9–10% ethanol
Federal test protocol
Gasoline particulate filter
Lean NOx trap
Low-temperature NOx adsorber
- NOx :
Nitrogen oxides: NO, NO2, etc.
New European drive cycle
Nuclear magnetic resonance
Portable emission measurement system
Particulate matter (in diesel emission)
Quasielastic neutron scattering
(SI engine) Spark-ignition
- C2, C3, Cx :
Refers to Cx as in CxHy components in diesel fuel and gasoline
Diffuse reflectance infrared Fourier transform spectroscopy
Diesel particulate filter
Fourier transform infrared spectroscopy
Four-way catalyst (also called GPF)
High-performance liquid chromatography
Selective catalytic reduction
Methane oxidation catalyst
Nitrous oxide, a potent greenhouse gas
- NH3 :
Platinum group metal
Passive NOx adsorber
Combined SCR-DPF (also called SCRF)
Temperature for 50% catalytic efficiency
Hammershøi, P.S., Vennestrøm, P.N.R., Falsig, H., Jensen, A.D., Janssens, T.V.W.: Importance of the Cu oxidation state for the SO2-poisoning of a Cu-SAPO-34 catalyst in the NH3-SCR reaction. Appl. Catal. B Environ. 236, 377–383 (2018). https://doi.org/10.1016/j.apcatb.2018.05.038
Hammershøi, P.S., Jensen, A.D., Janssens, T.V.W.: Impact of SO2-poisoning over the lifetime of a Cu-CHA catalyst for NH3–SCR. Appl. Catal. B Environ. 238, 104–110 (2018). https://doi.org/10.1016/j.apcatb.2018.06.039
Professor Andrea Strzelec (Mississippi State University) and Dr. Se Oh (General Motors R&D) contributed to “In the Memory of Dr. Dick Blint.” Their input is hereby appreciated.
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Color figures of this publication can be downloaded from http://www.emissol.com/publications.
Most presentations of speakers could be found at https://cleers.org/event/2018-cleers-workshop.
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Masoudi, M., Hensel, J. & Tegeler, E. A Review of the 2018 U.S.-DOE CLEERS Conference: Trends and Deeper Insights in Reduction of NOx and Particulate in Diesel and Gasoline Engines and Advances in Catalyst Materials, Mechanisms, and Emission Control Technologies. Emiss. Control Sci. Technol. 6, 113–125 (2020). https://doi.org/10.1007/s40825-019-00134-1