Non Thermal Plasma NOx Remediation: From Binary Gas Mixture to Lean-Burn Gasoline and Diesel Engine Exhaust
-
A. Khacef
,
J. M. Cormier
Abstract
Experiments are presented on the plasma removal of NOx (sum of NO and NO2 concentrations) and hydrocarbons in atmospheric pressure gas streams by sub-microsecond pulsed dielectric barrier discharge processing. This investigation presents the effects of electrical input energy, hydrocarbon addition, and water addition on the NOx chemistry and by-products formation. Exhaust gas mixtures with composition containing up to seven gases (CO, CO2, NO, O2, H2O, C3H6, N2) were synthesized. The objective is to use synthetic gas exhaust simulating diesel and Lean Burn gasoline engine exhaust with propene as a reductant agent. It was established that the observed chemistry in the plasma includes conversion of NO to NO2 as well as the partial oxidation of hydrocarbon. In a given reactor under identical gas composition and equivalent energy density deposition, experimental results show that the main parameter which controls the efficiency of the plasma process is the energy deposition mode. The best results on NOx and hydrocarbon removal efficiencies have been obtained at low input energy per pulse and high discharge frequency. NOx removal improves with increasing input energy deposition and the presence of water in the gas mixture appears to essentially enhance the chemistry process efficiency, reducing by this way the energy cost of the processes. For example, for an input energy density of 27 J/L, the fraction of NOx removed was about 60% with an energy cost less than 30 eV/molecule in the case of simulated diesel engine exhaust. The data obtained suggest that aldehydes (CH2O and CH3CHO) are formed in concert with NO oxidation to NO2 in the plasma phase. Methyl nitrate (CH3ONO2) and nitromethane (CH3NO2) are the main R-NOx compounds produced and small amounts of nitrous acid (HNO2) and formic acid (CH2O2) were also detected.
© 2016 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Preface
- The Oxidation of Carbon Soot in a Non-thermal, Atmospheric Pressure Plasma: Experiment and Modelling
- Study in Space and Time of the Gas Temperature Variations in Dielectric Barrier Discharge Reactors
- Removal of Phenol from Water: A Comparison of Energization Methods
- Non Thermal Plasma NOx Remediation: From Binary Gas Mixture to Lean-Burn Gasoline and Diesel Engine Exhaust
- Influences of Reactor Geometry on Ozone Production with Dielectric Barrier Discharges: Experimental and Simulation Studies
- Ozone Production by Primary and Secondary Streamers in Pulsed Positive Corona Discharge
- Hybrid Gas/Liquid Electrical Discharge Reactors with Zeolites for Colored Wastewater Degradation
- CF4/O2/He Reaction Chemistry in an Atmospheric Pressure Plasma Jet
- Enhancement of Propane Flame Stability by Dielectric Barrier Discharges
- Soot Free Non-Thermal Plasma Reforming of Hydro Carbon Gas by Flow Stabilized Corona Discharges
- Decoloration of Organic Dye in Water by Pulsed Discharge Plasma Generated Simultaneously in Gas and Liquid Media
- The Effect of Conductivity on Active Species Products by Electrical Discharge with Air Bubbles in Water
- The Role of Surface Reactions in De-NOx Processes in Corona Discharge-Catalyst (or Zeolite) Hybrid Systems
- Characteristics of DC Corona Streamers Induced by UV Laser Irradiation in Non-Thermal Plasma
- Decomposition of Gas-Phase Benzene Using Plasma – Driven Catalyst Reactor: Complete Oxidation of Adsorbed Benzene Using Oxygen Plasma
- A Solution to the Problem of Large Energy Consumption of the De-NOx Process by Non-Thermal Plasma
- DC and Pulsed Surface Corona Discharge along a Dielectric Flat Plate in Air: Electrical Properties and Discharge-Induced Ionic Wind
- Dependence of NOx Removal by Pulsed Streamer Discharge on the Input Energy Density to Nitric Oxide Ratio
- After-Treatment of NOx Using Combination of Non-Thermal Plasma and Oxidative Catalyst Prepared by Novel Impregnation
Articles in the same Issue
- Preface
- The Oxidation of Carbon Soot in a Non-thermal, Atmospheric Pressure Plasma: Experiment and Modelling
- Study in Space and Time of the Gas Temperature Variations in Dielectric Barrier Discharge Reactors
- Removal of Phenol from Water: A Comparison of Energization Methods
- Non Thermal Plasma NOx Remediation: From Binary Gas Mixture to Lean-Burn Gasoline and Diesel Engine Exhaust
- Influences of Reactor Geometry on Ozone Production with Dielectric Barrier Discharges: Experimental and Simulation Studies
- Ozone Production by Primary and Secondary Streamers in Pulsed Positive Corona Discharge
- Hybrid Gas/Liquid Electrical Discharge Reactors with Zeolites for Colored Wastewater Degradation
- CF4/O2/He Reaction Chemistry in an Atmospheric Pressure Plasma Jet
- Enhancement of Propane Flame Stability by Dielectric Barrier Discharges
- Soot Free Non-Thermal Plasma Reforming of Hydro Carbon Gas by Flow Stabilized Corona Discharges
- Decoloration of Organic Dye in Water by Pulsed Discharge Plasma Generated Simultaneously in Gas and Liquid Media
- The Effect of Conductivity on Active Species Products by Electrical Discharge with Air Bubbles in Water
- The Role of Surface Reactions in De-NOx Processes in Corona Discharge-Catalyst (or Zeolite) Hybrid Systems
- Characteristics of DC Corona Streamers Induced by UV Laser Irradiation in Non-Thermal Plasma
- Decomposition of Gas-Phase Benzene Using Plasma – Driven Catalyst Reactor: Complete Oxidation of Adsorbed Benzene Using Oxygen Plasma
- A Solution to the Problem of Large Energy Consumption of the De-NOx Process by Non-Thermal Plasma
- DC and Pulsed Surface Corona Discharge along a Dielectric Flat Plate in Air: Electrical Properties and Discharge-Induced Ionic Wind
- Dependence of NOx Removal by Pulsed Streamer Discharge on the Input Energy Density to Nitric Oxide Ratio
- After-Treatment of NOx Using Combination of Non-Thermal Plasma and Oxidative Catalyst Prepared by Novel Impregnation
