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US 5,767,470 AGranted
Process and device for removal of combustion pollutants under high oxygen conditions
OwnerChang Yul Chainventor
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Abstract
The subject invention is a process and device to effectively remove combustion pollutants under oxygen conditions greater than six volume percent. Microwave enhancement of oxidation/reduction catalysis is selectively employed in a multiple step process. However some of the steps do not utilize microwaves as they convert NO to NO.sub.2 by employing a conventional oxidation catalyst, and which then in a subsequent step which does employ microwaves uses a reducing agent to undergo catalytic reduction to N.sub.2.
Claims9
A process for removal of pollutants from a combustion stream containing more than six percent oxygen by volume comprising:
- passing said stream through a filter in contact with microwaves to collect and burn soot;
- oxidizing without microwave enhancement nitric oxide to nitrogen dioxide by employing a first oxidation/reduction catalyst;
- removing said nitrogen dioxide by using microwave enhanced reduction with a second oxidation/reduction catalyst in contact with a reducing agent;
- and
- removing combustible pollutants by using microwave enhanced oxidation with a third oxidation/reduction catalyst.
2 more elements
Dependencies are inferred from the claim text.