Apparatus for plasma treatment of a gas

An apparatus for treating a polluting or toxic gas, comprising:

• a hollow cathode that has a structure that produces a hollow cathode effect in which electrons inside said hollow cathode undergo pendulum electron motion and produce a hollow cathode discharge plasma in said hollow cathode when the device is operating, said hollow cathode having a gas inlet end that receives a polluting or toxic gas and a gas discharge end that discharges the gas after treatment by the hollow cathode discharge plasma;
• a counter electrode outside and adjacent to one of said gas inlet and gas discharge ends;
• a particle filter at said gas inlet end that filters the polluting or toxic gas;
• a quenching electrode at said gas discharge end that receives the treated gas;
• means for heating and/or cooling at least one of said particle filter and said quenching electrode;
• and
• an electric power generator that powers said hollow cathode and said counter electrode when the device is operating.

An apparatus for treating a polluting or toxic gas, comprising:

• hollow cathode means for producing a hollow cathode discharge plasma in said hollow cathode when the device is operating, said hollow cathode having a gas inlet end that receives a polluting or toxic gas and a gas discharge end that discharges the gas after treatment by the hollow cathode discharge plasma;
• a counter electrode outside and adjacent to one of said gas inlet and gas discharge ends;
• a particle filter at said gas inlet end that filters the polluting or toxic gas;
• a quenching electrode at said gas discharge end that receives the treated gas;
• means for heating and/or cooling at least one of said particle filter and said quenching electrode;
• and
• an electric power generator that powers said hollow cathode means and said counter electrode when the device is operating.