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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

  • M. MasoudiEmail author
  • J. Hensel
  • E. Tegeler
Special Issue: 2018 CLEERS Workshop, September 18-20, Ann Arbor, Michigan, United States
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Abstract

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.

Keywords

Automotive emissions Three-way catalysts Diesel oxidation catalysts Selective catalytic reduction Particulate filters Urea-water solution CLEERS Workshop 

Nomenclature

BEA

Beta polymorph A—one of various zeolite types

CHA

Chabazite—one of various zeolite types, also SSZ-13 (a synthetic type of CHA)

DFT

Density functional theory

DOC

Diesel oxidation catalyst

E10

Fuel blended with 9–10% ethanol

FTP

Federal test protocol

GPF

Gasoline particulate filter

HC

Hydrocarbon

LNT

Lean NOx trap

LTNA

Low-temperature NOx adsorber

TWC

Three-way catalyst

NOx

Nitrogen oxides: NO, NO2, etc.

NEDC

New European drive cycle

NMR

Nuclear magnetic resonance

PEMS

Portable emission measurement system

PM

Particulate matter (in diesel emission)

QENS

Quasielastic neutron scattering

SI

(SI engine) Spark-ignition

TG

Thermogravimetry

TPR

Temperature-programmed reaction

C2, C3, Cx

Refers to Cx as in CxHy components in diesel fuel and gasoline

DRIFTS

Diffuse reflectance infrared Fourier transform spectroscopy

DPF

Diesel particulate filter

FTIR

Fourier transform infrared spectroscopy

FWC

Four-way catalyst (also called GPF)

H2O

Water

HPLC

High-performance liquid chromatography

LO

Light-off

SCR

Selective catalytic reduction

MOC

Methane oxidation catalyst

N2O

Nitrous oxide, a potent greenhouse gas

NH3

Ammonia

OBD

Onboard diagnostics

PGM

Platinum group metal

PNA

Passive NOx adsorber

SDPF

Combined SCR-DPF (also called SCRF)

T50

Temperature for 50% catalytic efficiency

TPD

Temperature-programmed desorption

Notes

Acknowledgments

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.

Compliance with Ethical Standards

The authors declare that they have no competing interests. Use of figures within this article is with express consent of their respective authors or copyright holders.

References

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    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 CrossRefGoogle Scholar
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    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 CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Emissol LLCMill CreekUSA

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