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Plasma Enhanced Selective Catalytic Reduction of NOx in Diesel Exhaust: Test Bench Measurements
Technical Paper
1999-01-3633
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The potential of plasma enhanced selective catalytic reduction (PE-SCR) for Diesel-exhaust treatment at temperatures between 60 °C and 180 °C has been investigated in test bench measurements with a 1.9 liter 66 kW VW Passat TDI engine. Non-thermal plasmas were generated by pulsed electrical excitation of dielectric barrier discharge (DBD) modules each having a flow cross section of 9.5 cm2 and an electrode length of 26 cm. Monolithic V2O5-WO3/TiO2-catalysts with cell densities of 150 cpsi and 200 cpsi were used for selective catalytic reduction.
First experiments were performed with a single DBD module and a catalyst volume of 3.5 liters. For temperatures between 100 °C and 160 °C and exhaust gas flow rates below 1200 liters (STP)/min NOx-reduction rates up to 14 g/h were obtained with an energy cost of about 20 Wh/g NOx. At larger gas flow rates NOx-reduction rates decreased even at higher temperatures.
A reactor suitable for larger gas flow rates was obtained applying three DBD modules in parallel and a catalyst with a volume of 6 liters. NOx-reduction rates of 21 g/h were obtained in a test cycle beginning with a cold start and ending with an exhaust temperature of 140 °C. Energy costs were reduced to about 6.3 Wh/g NOx.
Authors
Citation
Hammer, T. and Bröer, S., "Plasma Enhanced Selective Catalytic Reduction of NOx in Diesel Exhaust: Test Bench Measurements," SAE Technical Paper 1999-01-3633, 1999, https://doi.org/10.4271/1999-01-3633.Also In
Non-Thermal Plasma for Exhaust Emission Control: Nox, Hc, and Particulates
Number: SP-1483; Published: 1999-10-25
Number: SP-1483; Published: 1999-10-25
References
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- Odenbrand C.U. Ingemar Andersson Lars A.H. Brandin Jan G.M. Lundin Sten T. “Catalytic Reduction of Nitrogen Oxides. 2. The Reduction of NO2” Applied Catalysis 27 363 377 1986
- Hammer Thomas Bröer Stefan “Plasma Enhanced Selective Catalytic Reduction of NOx for Diesel Cars” SAE paper no. 982428 1998
- Hammer Thomas Kishimoto Tetsuo Miessner Hans Rudolph Rolf “Plasma Enhanced Selective Catalytic Reduction: Kinetics of NOx-Removal and Byproduct Formation” SAE paper 99fl-255 1999
- Hammer Thomas Bröer Stefan Kishimoto Tetsuo “Pulsed Excitation of Silent Discharges for Diesel Exhaust Treatment” 4 th Int. Conf. on Advanced Oxidation Technologies for Water and Air Remediation (AOTs-4) Orlando, Florida, USA September 23-26 1997 J. Adv. Oxidation Technologies