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Plasma Enhanced Selective Catalytic Reduction: Kinetics of NOx-Removal and Byproduct Formation
Technical Paper
1999-01-3632
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The mechanisms of plasma enhanced selective catalytic reduction of NOx on a V2O5-WO3/TiO2-catalyst were investigated for temperatures between 100 °C and 200 °C by applying various analytical methods.
In experiments with synthetic gas mixtures containing Ar instead of N2 as a carrier gas the formation of N2 as a main product and thus catalytic reduction of NOx in reactions with NH3 has been proven using mass spectroscopy. More detailed information on the reaction kinetics of NO-formation and removal induced by non-thermal plasmas has been obtained from experiments in gas mixtures containing isotopically marked 15NO. FTIR-absorption spectroscopy was applied to measure the concentrations of 14N- and 15N-containing molecules.
Particles formed by the combined plasma- and catalytic treatment of Diesel exhaust with NH3 as reducing agent were analyzed by energy dispersive X-ray scattering. The spectra indicate, that mainly sulfur containing particles were formed. Formation of NH4NO3 plays a minor role. Non-thermal plasma treatment did not show a strong influence on catalytic removal of unburned hydrocarbons, but increased CO-emission was observed.
In all experiments plasma induced conversion of NO to NO2 increased NOx-reduction rates.
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Hammer, T., Kishimoto, T., Miessner, H., and Rudolph, R., "Plasma Enhanced Selective Catalytic Reduction: Kinetics of NOx-Removal and Byproduct Formation," SAE Technical Paper 1999-01-3632, 1999, https://doi.org/10.4271/1999-01-3632.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
- Siemens AG 24 24 Januar 1997
- Hammer Thomas, Bröer Stefan “Plasma Enhanced Selective Catalytic Reduction of NOx for Diesel Cars” SAE paper no. 982428 1998
- 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 Technol.
- Hoard John Balmer M. Lou “Analysis of Plasma-Catalysis for Diesel NOx Remediation” SAE paper no. 982429 1998
- Slone Ralph Ramavajjala Madhu Palekar Vishwesh Puchkarev Victor “Pulsed Corona Plasma Technology for the Removal of NOx from Diesel Exhaust” SAE paper no. 982431 1998
- McLarnon Christopher R. Penetrante Bernie M. “Effect of Gas Composition on the NOx Conversion Chemistry in a Plasma” SAE paper no. 982433 1999
- Penetrante B.M. et al. “Plasma Assisted Catalytic Reduction of NOx” SAE paper no. 982508 1998