This content is not included in your SAE MOBILUS subscription, or you are not logged in.
The role of NO Selective Catalysts in the Plasma Enhanced Removal of NOx and PM from Diesel Exhausts
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 24, 2001 by SAE International in United States
Annotation ability available
Event: Spring Fuels & Lubricants Meeting & Exhibition SAE International Fall Fuels & Lubricants Meeting & Exhibition
Non-thermal plasma (NTP) systems are attracting increasing interest as candidates for future generation diesel exhaust aftertreatment technologies. Strategies are being investigated for lean NOx reduction, particulate (PM) oxidation and for combined NOx and PM aftertreatment. One approach for plasma-catalyst NOx reduction is to convert NO to NO2 with a plasma and then reduce the NO2 over a suitable catalyst. However, it has been recently suggested that particulate in the diesel exhaust may inhibit the NTP conversion of NO into NO2 in a plasma regenerating diesel particulate filter (DPF). In addition some NO2 selective catalysts are demonstrating high levels of N2O production rather than being selective to N2. It has been suggested that combined NOx and PM removal could be achieved by employing an NO selective reduction catalyst in combination with a plasma DPF.
Silver-doped alumina (Ag-Al2O3) is shown to be a particularly effective catalyst for NO reduction. Combination of this catalyst with a plasma resulted in the NOx reduction being enhanced. This effect is especially pronounced at lower exhaust temperatures characteristic of passenger car exhausts. It was found that the plasma catalyst enhancement was effective with both propene and diesel fuel acting as a reductant.
Studies appear to show a link between plasma enhanced NO reduction and the generation of active species such as formaldehyde (CH2O). It appears that the composition of the reductant mixture in the exhaust stream plays a fundamental role in the plasma catalyst mechanism that enhances NO reduction. The combination of this catalyst and plasma would support the proposed PM / NOx removal strategy.
CitationThomas, S., Shawcross, J., Gillespie, R., Raybone, D. et al., "The role of NO Selective Catalysts in the Plasma Enhanced Removal of NOx and PM from Diesel Exhausts," SAE Technical Paper 2001-01-3568, 2001, https://doi.org/10.4271/2001-01-3568.
- Timothy. Johnson “Diesel Emission Control Technology in Review” SAE 2001-01-0185
- Hoard John Laing Paul Balmer M. Lou Tonkyn Russ “Comparison of Plasma-Catalyst and Lean NOx Catalyst for Diesel NOx Reduction” SAE 2000-01-2895
- Parvulescu V.I. Grange P. Delmon B. “Catalytic Removal of NO” Catalysis Today 46 1998 233 316
- Shelef M. “Selective Catalytic Reduction of NOx with N-free Reductants.” Chem.Rev. 1995 209 225
- Iwamoto Masakazu Hernandez Angel M. Zengyo Tetsu “Oxidation of NO to NO 2 on a Pt-MFI Zeolite and Subsequent Reduction by C 2 H 4 on an In-MFI Zeolite: a Novel de-NOx Strategy in Excess Oxygen.” Chem. Commum. 1997
- Davies Michael J. Jorgensen Norman Carlow John S. Raybone David 1992
- Penetrante BM Brusasco RM Merritt BT Pitz WJ Vogtlin GE Kung MC Kung HH Wan CZ Voss KE “Plasma-Assisted Catalytic Reduction of NOx” SAE 982508
- Aardahl CL Habeger CF Balmer ML Rappe KG Tran DN Avila M Park PW Koshkarian KA Chanda A “Plasma Enhanced Catalytic Reduction of NOx in Simulated Lean Exhaust.” SAE 2000-01-2961
- Hammer Thomas Broer Stefan “Plasma enhanced Selective Catalytic Reduction of NOx in Diesel Exhaust: Test Bench Measurements.” SAE 1999-01-3633
- Thomas Suzanne E. Martin Anthony R. Raybone David Shawcross James T. Ng Ka Lok Beech Phil Whitehead J. Christopher “Non-Thermal Plasma Aftertreatment of Particulates- Theoretical Limits and Impact on Reactor Design.” SAE 2000-01-1926
- Thomas S. Shawcross J. Beech P. Morgan R. Raybone D. “Non Thermal Plasma Aftertreatment of Particulates.” Proceedings of DEER Workshop 2000 (In Press)
- Masters S.G. Chadwick D. “Selective Reduction of Nitric Oxide by Methanol and Dimethyl Ether Over Promoted Alumina Catalysts in Excess Oxygen” Applied Catalysis B 23 1999 235 246
- Balmer M.Lou Tonkyn Russ Yoon Steve Kolwaite Ana Barlow Steve Maupin Gary Hoard John “NOx Destruction Behaviour of Select Materials When Combined with an Non Thermal Plasma.” SAE 1999-01-3640
- Tonkyn Russell Yoon Steven Barlow S.E. Panov Alexander Kolwaite Ana Balmer M. lou “Lean NOx Reduction in Two Stages: Non-Thermal Plasma Followed by Heterogeneous Catalysis” SAE 2000-01-2896
- Martens Johan A. Cauvel Anne Francis Agna Hermans Chris Jayat Francois Remy Marc Keung Michael Lievens Jan Jacobs Pierre A. Agnew “NOx abatement in Exhaust from Lean-Burn Combustion Engines by Reduction of NO 2 Over Silver-Containing Zeolite Catalysts” Chem. Int. Ed. 1998 37 13 14
- Bethke K.A. Kung H.H. “Supported Ag Catalysts for Lean Reduction of NO with C 3 H 6 ” Journal of Catalysis 172 93 102 1997
- Meunier F.C. Breen J.P. Zuzaniuk V. Olsson M. Ross J.R.H. “Mechanistic Aspects of the Selective Catalytic Reduction of NO by Propene Over Alumina and Silver-Alumina Catalysts.” Journal of Catalysis 187 493 505 1999
- Keshavaraja A. She X. Flytzani M. “Selective Catalytic Reduction of NO with Methane Over Ag-Alumina Catalysts” Letter Applied Catalysis B 27
- Shimizu Ken-ichi Satsuma Atsushi Hattori Tadashi “Catalytic Performance of Ag-Al 2 O 3 Catalyst for the Selective Catalytic Reduction of NO by Higher Hydrocarbons.” Applied Catalysis B 25 2000 239 247
- Martinez-Arias A. Fernandez-Garcia M. Iglesias-Juez A. Anderson J.A. Conesa J.C. Soria J. “Study of Lean NOx Reduction with C 3 H 6 in the Presence of Water Over Silver/Alumina Prepared from Inverse Microemulsions” Applied Catalysis B 28 2000 29 41
- Miyadera Tatsuo “Alumina supported silver catalysts for Selective Catalytic Reduction of Nitric Oxide with Propene and Oxygen-Containing Organic Compounds.” Applied Catalysis B 2 1993 199 205
- Masuda K. Tsujimura K. Shinoda K. Kato T. “Silver-promoted Catalyst for Removal of Nitrogen Oxides from Emissions of Diesel Engines.” Applied Catalysis B 8 1996 33 40
- Eranen Kari Lindfors Lars-Eric Nieme Anna Elfving Pernilla Cider Lennart “Influence of Hydrocarbons on the Selective Catalytic Reduction of NOx over Ag-Al 2 O 3 - Laboratory and Engine Tests” SAE 2000-01-2813
- Chun Bae-Hyeock Lee Hyeong-Sang Nam Chang-Soo Chun Kwang Min Ryu Jae Hong Lee Kwan-Young “Plasma/Catalyst System for Reduction of NOx in Diesel Engine Exhaust” SAE 2000-01-2897
- Hanst P.L. QA reference library 1996 Infra Red Analysis Inc.