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Khatri P, Bhatia D. Effect of
H
2
,
H
2
O
, and
CO
2
on the
deNO
x
characteristics of a combined passive
NO
x
adsorber and
NO
x
reduction catalyst. AIChE J 2022. [DOI: 10.1002/aic.17675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Prateek Khatri
- Department of Chemical Engineering Indian Institute of Technology Delhi New Delhi India
| | - Divesh Bhatia
- Department of Chemical Engineering Indian Institute of Technology Delhi New Delhi India
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2
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An Overview of Lean Exhaust deNOx Aftertreatment Technologies and NOx Emission Regulations in the European Union. Catalysts 2021. [DOI: 10.3390/catal11030404] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
This paper reviews the recent advances in the management of nitrogen oxide (NOx) emissions from the internal combustion engine of light-duty and heavy-duty vehicles, addressing both technical and legal aspects. Particular focus is devoted to the often-virtuous interaction between new legislation imposing more restrictions on the permitted pollutant emission levels and new technologies developed in order to meet these restrictions. The review begins first with the American and then European directives promulgated in the 1970s, aimed at limiting emissions of pollutants from road transport vehicles. Particular attention is paid to the introduction of the Euro standards in the European Union for light- and heavy-duty vehicles, used as a legal and time frame reference for the evolution of emission aftertreatment systems (ATSs). The paper also describes governmental approaches implemented for the control of pollutant emissions in circulating vehicles, such as market surveillance and in-service conformity. In parallel, it is explained how the gradual introduction of small-scale devices aimed at the NOx control, such as lean NOx traps (LNTs) systems, and, most of all, the selective catalytic reduction (SCR) of NOx, permitted the application to road-transport vehicles of this ATS, originally designed in larger sizes for industrial usage. The paper reviews chemical processes occurring in SCR systems and their advantages and drawbacks with respect to the pollutant emission limits imposed by the legislation. Their potential side effects are also addressed, such as the emission of extra, not-yet regulated pollutants such as, for example, NH3 and N2O. The NOx, N2O, and NH3 emission level evolution with the various Euro standards for both light- and heavy-duty vehicles are reported in the light of experimental data obtained at the European Commission’s Joint Research Centre. It is observed that the new technologies, boosted by increasingly stricter legal limits, have led in the last two decades to a clear decrease of over one order of magnitude of NOx emissions in Diesel light-duty vehicles, bringing them to the same level as Euro 6 gasoline vehicles (10 mg/km to 20 mg/km in average). On the other hand, an obvious increase in the emissions of both NH3 and N2O is observed in both Diesel and gasoline light-duty vehicles, whereby NH3 emissions in spark-ignition vehicles are mainly linked to two-reaction mechanisms occurring in three-way catalysts after the catalyst light-off and during engine rich-operation. NH3 emissions measured in recent Euro 6 light-duty vehicles amount to a few mg/km for both gasoline and Diesel engines, whereby N2O emissions exceeding a dozen mg/km have been observed in Diesel vehicles only. The present paper can be regarded as part of a general assessment in view of the next EU emission standards, and a discussion on the role the SCR technology may serve as a NOx emission control strategy from lean-burn vehicles.
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Performance and Mechanistic Aspects of Ag/MgO/$${\varvec{\gamma}}$$-Al2O3 as a Passive NOx Adsorber. Catal Letters 2021. [DOI: 10.1007/s10562-021-03565-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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4
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Wang A, Xie K, Kumar A, Kamasamudram K, Olsson L. Layered Pd/SSZ-13 with Cu/SSZ-13 as PNA − SCR dual-layer monolith catalyst for NOx abatement. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.01.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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5
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Recent advances in catalytic automotive emission control: Passive
NO
storage at low temperatures. J CHIN CHEM SOC-TAIP 2020. [DOI: 10.1002/jccs.202000203] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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6
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Ilmasani RF, Woo J, Creaser D, Olsson L. Influencing the NOx Stability by Metal Oxide Addition to Pd/BEA for Passive NOx Adsorbers. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b06976] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rojin Feizie Ilmasani
- Department of Chemistry and Chemical Engineering, Competence Center for Catalysis, Chalmers University of Technology, Göteborg SE-412 96, Sweden
| | - Jungwon Woo
- Department of Chemistry and Chemical Engineering, Competence Center for Catalysis, Chalmers University of Technology, Göteborg SE-412 96, Sweden
| | - Derek Creaser
- Department of Chemistry and Chemical Engineering, Competence Center for Catalysis, Chalmers University of Technology, Göteborg SE-412 96, Sweden
| | - Louise Olsson
- Department of Chemistry and Chemical Engineering, Competence Center for Catalysis, Chalmers University of Technology, Göteborg SE-412 96, Sweden
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Moliner M, Corma A. From metal-supported oxides to well-defined metal site zeolites: the next generation of passive NOxadsorbers for low-temperature control of emissions from diesel engines. REACT CHEM ENG 2019. [DOI: 10.1039/c8re00193f] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Passive NOxadsorbers as new components to complement SCR catalysts to control cold-start NOxemissions efficiently.
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Affiliation(s)
- Manuel Moliner
- Instituto de Tecnología Química
- Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
- 46022 València
- Spain
| | - Avelino Corma
- Instituto de Tecnología Química
- Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
- 46022 València
- Spain
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8
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Mihai O, Trandafilović L, Wentworth T, Torres FF, Olsson L. The Effect of Si/Al Ratio for Pd/BEA and Pd/SSZ-13 Used as Passive NOx Adsorbers. Top Catal 2018. [DOI: 10.1007/s11244-018-1017-z] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Braun P, Gebhard J, Matysik FM, Rabl HP. Potential Technical Approaches for Improving Low-Temperature NOxConversion of Exhaust Aftertreatment Systems. CHEM-ING-TECH 2018. [DOI: 10.1002/cite.201700122] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Peter Braun
- Ostbayerische Technische Hochschule Regensburg; Fakultät Maschinenbau; Galgenbergstraße 30 93053 Regensburg Germany
- Universität Regensburg; Institute of Analytical Chemistry, Chemo- and Biosensors; Universitätsstraße 31 93053 Regensburg Germany
| | - Jürgen Gebhard
- Ostbayerische Technische Hochschule Regensburg; Fakultät Maschinenbau; Galgenbergstraße 30 93053 Regensburg Germany
| | - Frank-Michael Matysik
- Universität Regensburg; Institute of Analytical Chemistry, Chemo- and Biosensors; Universitätsstraße 31 93053 Regensburg Germany
| | - Hans-Peter Rabl
- Ostbayerische Technische Hochschule Regensburg; Fakultät Maschinenbau; Galgenbergstraße 30 93053 Regensburg Germany
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Ji Y, Xu D, Bai S, Graham U, Crocker M, Chen B, Shi C, Harris D, Scapens D, Darab J. Pt- and Pd-Promoted CeO2–ZrO2 for Passive NOx Adsorber Applications. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b03793] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yaying Ji
- Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
| | - Dongyan Xu
- Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
| | - Shuli Bai
- Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
| | - Uschi Graham
- Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
| | - Mark Crocker
- Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
- Department
of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Bingbing Chen
- Dalian University of Technology, Dalian, CN 116024, P. R. China
| | - Chuan Shi
- Dalian University of Technology, Dalian, CN 116024, P. R. China
| | - Deb Harris
- MEL Chemicals, Manchester, M27 8LS, United Kingdom
| | - Dave Scapens
- MEL Chemicals, Manchester, M27 8LS, United Kingdom
| | - John Darab
- MEL Chemicals
Inc., Flemington, New Jersey 08822, United States
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11
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Jones S, Ji Y, Crocker M. Ceria-Based Catalysts for Low Temperature NO
x
Storage and Release. Catal Letters 2016. [DOI: 10.1007/s10562-016-1704-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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