Catalyst composition for exhaust gas treatment
AssigneeW. R. Grace & Co.
InventorsMichael V. Ernest, James M. Maselli
Life of this patent
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Abstract
Suspended particles in exhaust gases, such as carbon and lead particles in internal combustion engine exhaust gases, are removed by passing the gases through a coarse filter and then through a fine filter. The filters may comprise a ceramic foam material and a catalyst material effective for the conversion of the carbon particles and/or gaseous pollutants in the exhaust gases to innocuous entities may be deposited on the filters.
Claims14
A composition for converting one or more pollutants in an exhaust gas to innocuous entities and removing suspended particles from the gas which comprises a catalyst material effective for the conversion deposited on a coarse ceramic foam filter having a pore size of from about 2 to about 20 pores per 25 millimeters in length and on a fine ceramic foam filter having a pore size of from about 15 to about 50 pores per 25 millimeters in length, said filters positioned so that the gas flows in succession through the coarse filter and the fine filter.
A composition for collecting and disposing of carbon particulates in exhaust gases of internal combustion engines which comprises a carbon combustion catalyst material deposited on a coarse ceramic foam filter having a pore size of from about 2 to about 20 pores per 25 millimeters in length and a fine ceramic foam filter having a larger pore size of from about 15 to about 50 pores per 25 millimeters in length, said filters positioned so that the gases flow in succession through the coarse filter and the fine filter.
Dependencies are inferred from the claim text.