Process for manufacturing a carbonaceous catalyst for the reduction of nitrogen oxides in exhaust gases
AssigneeBergwerksverband GmbH
InventorsKarl Knoblauch, Ekkehard Richter, Hans-Jurgen Schmidt
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Abstract
A process is disclosed for treating carbonaceous catalyst with a gaseous halogen or a gaseous halogen compound to increase the catalytic activity and prolong the useful life of the catalyst. The treatment of the catalyst is conducted at temperatures above about 150 degrees C., preferably with the use of an inert gas, which inert gas is flowed through the carbonaceous material, and which inert gas carries the gaseous halogen or the gaseous halogen compound to the carbonaceous material.
Claims20
A process for treating activated carbon to produce a catalyst for use in the reduction of oxides in exhaust gases, said process comprising;
- treating the activated carbon with a gaseous halogen, chosen from the group consisting of bromine, hydrogen bromide, hydrogen fluoride, and hydrogen iodide, at a temperature greater than about 150.degree. C. for a length of time to irreversibly bond the halogen to the activated carbon and to increase the catalytic activity for reducing oxides in exhaust gases.
A process for treating activated carbon to produce a catalyst for use in the reduction of oxides in exhaust gases, said process comprising;
- treating the activated carbon with a gas containing a gaseous halogen, chosen from the group consisting of chlorine and hydrogen chloride, within a temperature range of between about 150.degree. C. to about 200.degree. C. for a length of time to irreversibly bond the halogen to the activated carbon and to increase the catalytic activity for reducing oxides in exhaust gases.
Dependencies are inferred from the claim text.