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US 5,536,477 AGranted
Pollution arrestor
AssigneeChang Yul Cha
InventorsSuk B. Cha, Chang Y. Cha
Life of this patent
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Abstract
A pollution arrestor removes various pollutants, such as soot, NO.sub.x, CO and hydrocarbons, from a gas stream. The pollution arrestor is composed in layers starting with a particulate filter to remove soot followed by various catalytic sections enhanced by radiofrequency microwave energy. The leaving gas is substantially reduced in pollution.
Claims2
A pollution arrestor for a gas stream containing multiple pollutants comprising:
- an encompassing microwave cavity;
- a plurality of sections being selected from the group consisting of the physical arrangement of concentric hollow cylinders, superposed planes, and aligned hollow cylinders, which said gas stream passes through in series;
- a first section consisting of a particulate collecting high temperature filter being selected from group consisting of ceramic filters, ceramic foam filters, and silicon carbide;
- and
- multiple sections following said first section composed of a substrate or impregnated substrate impregnated with a material selected from the group consisting of oxides of copper-gadolinium, platinum, and palladium.
2 more elements
A pollution arrestor for a gas stream containing soot comprising:
- a microwave cavity supporting a radiofrequency energy field selected from the frequency range of 915 to 5000 megahertz, two sections being selected from the group consisting of the physical arrangement of concentric hollow cylinders, superposed planes, and aligned hollow cylinders, and whose substrate contains silicon carbide which said gas stream passes through in series;
- a first section consisting of said soot collecting high temperature substrate and further containing oxides of copper-gadolinium catalyst;
- and
- a second section consisting of platinum or palladium catalyst upon said substrate.
1 more element
Dependencies are inferred from the claim text.