An exhaust gas control apparatus includes a dust collection device, an oxidation treatment device, and an ECU. The dust collection device applies a DC voltage between a charging electrode and a counter electrode, and collects particulate matter on an oxidation substrate. The ECU estimates a distribution of a deposition amount of the particulate matter deposited on the oxidation substrate in a flow direction of exhaust gas, based on input information including at least a flow rate of exhaust gas and a mass of particulate matter in exhaust gas, setting information including at least an electric field intensity between the charging electrode and the counter electrode, and history information on the oxidation treatment. The ECU carries out the oxidation treatment when the deposition amount of at least a part of the deposited particulate matter exceeds a threshold.

A contaminant reducing device is provided. The contaminant reducing device comprises: an exhaust gas tube for supplying exhaust gas from a combustion engine; a cleaning water supply tube for supplying cleaning water; a scrubber for spraying cleaning water, which is supplied through the cleaning water supply tube, to exhaust gas supplied through the exhaust gas tube; an oxidation unit connected to the exhaust gas tube so as to oxidize the exhaust gas by discharging electricity, emitting ultraviolent rays, or spraying an oxidizer; and a cleaning water discharge tube for discharging cleaning water from inside the scrubber.

This disclosure relates generally to an emitter for dissociating exhaust gases on a molecular level into their respective elemental constituents. The emitter includes a palladium plated anode and a cathode, at least a portion of which is palladium plated. When properly powered, the emitters create a non-linear quantum dissonance field to dissociate molecules in exhaust.

An exhaust aftertreatment system for purifying an exhaust gas feedstream expelled from an internal combustion engine that is operable at an air/fuel ratio that is lean of stoichiometry is described. The exhaust aftertreatment system includes a plasma reactor disposed upstream of a selective catalytic reactor device. The plasma reactor is electrically connected to a plasma controller. The plasma controller controls the plasma reactor to generate ozone from constituents of the exhaust gas feedstream, and the ozone reacts to oxidize nitrogen oxide contained in the exhaust gas feedstream to form nitrogen dioxide. The nitrogen dioxide reacts with a reductant in the selective catalytic reactor device to form elemental nitrogen and water.

An exhaust treatment apparatus (ATA) for reducing one or more components of the airstream directed through the ATA. The ATA includes an airstream inlet, an airstream outlet, and an airstream path directed through the ATA from the airstream inlet to the airstream outlet, and at least one corona/NTP generating region for altering a composition of an airstream. The ATA includes an outer enclosure forming one electrode surface and a second electrode surface positioned within and electrically insulated from the outer enclosure electrode surface, where an area between the outer enclosure electrode surface and the second electrode surface forms at least a part of the airstream path directed through the ATA. The second electrode surface includes a series of ridges directed towards the outer enclosure that encourage corona generation. A method is provided for using the ATA for treating an airstream, including an exhaust airstream from a combustion engine, as well as an exhaust airstream from a compression-ignition (diesel) engine.

An exhaust aftertreatment system for purifying an exhaust gas feedstream that is expelled from an internal combustion engine that is operable at an air/fuel ratio that is lean of stoichiometry is described. The exhaust aftertreatment system includes a barrier discharge plasma reactor that is disposed upstream relative to a catalytic reactor and electrically connected to a plasma controller. The barrier discharge plasma reactor is controlled to generate ozone from constituents of the exhaust gas feedstream when the internal combustion engine is operating at a lean air/fuel ratio and at a low temperature condition. The generated ozone reacts, in the catalytic reactor, to oxidize non-methane hydrocarbons contained in the exhaust gas feedstream when the internal combustion engine is operating at lean air/fuel ratio and at low temperature conditions.

The present invention provides a plasma generating system that includes: a plurality of plasma reactors. Each plurality of plasma reactors includes: a waveguide for transmitting a microwave energy therethrough; a plasma chamber coupled to the waveguide and configured to generate a plasma therein using the microwave energy; a gas inlet for introducing a gas into the plasma chamber; an exhaust gas pipe for carrying an exhaust gas from the plasma chamber, wherein the plasma converts the gas into the exhaust gas; and a pressure control device installed in the exhaust gas pipe and configured to control a pressure of the exhaust gas in the exhaust gas pipe. The plasma generating system also includes a manifold coupled to the exhaust gas pipes of the plurality of plasma reactors and configured to receive the exhaust gas from the exhaust gas pipes.

In some embodiments an apparatus for treating an exhaust gas in a foreline of a substrate processing system may include a dielectric tube configured to be coupled to the foreline of the substrate processing system to allow a flow of exhaust gases from the foreline through the dielectric tube; an RF coil wound about an outer surface of the dielectric tube, the RF coil having a first end to provide an RF input to the RF coil, the first end of the RF coil disposed proximate a first end of the dielectric tube and a second end disposed proximate a second end of the dielectric tube; a tap coupled to the RF coil to provide an RF return path, the tap disposed between the first end of the dielectric tube and a central portion of the dielectric tube.

Methods and systems are provided for addressing engine cold-start emissions while an exhaust catalyst is activated. In one example, a method for improving exhaust emissions may include flowing ionized air into an engine exhaust, downstream of an exhaust catalyst, to oxidize exhaust emissions left untreated by the catalyst. The approach reduces the PM load of the exhaust as well as of a downstream particulate matter filter.

Methods and systems are provided for addressing engine cold-start emissions while an exhaust catalyst is activated. In one example, a method for improving exhaust emissions may include flowing ionized air into an engine exhaust, downstream of an exhaust catalyst, to oxidize exhaust emissions left untreated by the catalyst. The approach reduces the PM load of the exhaust as well as of a downstream particulate matter filter.