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Abstract

An improved process is described for reducing the levels of nitrogen oxides and carbon monoxide present in flue gases. The process consists of preparing a bed of expanded vermiculite, expanded perlite, or borosilicate glass wool and passing a flue gas containing nitrogen oxides and carbon monoxide through the bed, whereas the vermiculite, perlite, or glass wool making up the bed material serves as a catalyst for the reduction of the nitrogen oxides to gaseous nitrogen and oxygen and the reduction of carbon monoxide to carbon and oxygen, the carbon being deposited on the bed particles. After the deposition of carbon, the bed material is then exposed to an oxidizing gas stream, during which time the deposited carbon is converted to carbon dioxide and the bed material is conditioned to accept flue gas again.

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First Claim