| 摘要 |
1,182,738. Removal of CO and NO from gases. PITTSBURGH ACTIVATED CARBON CO. 21 June, 1968 [13 Oct., 1967; 14 July, 1967; 19 July, 1967], No. 29661/68. Heading C1A. Carbon monoxide or nitric oxide are oxidized, when in a gas mixture, by passing the mixture through a high-surface-area support impregnated with a copper-chromium compound and/ or a mixture of compounds of copper and chromium, the chromium being in oxidation state VI, and the oxidation products thereafter removed. The impregnant may also include a silver compound, and may comprise or consist of copper chromate. Any convenient copper compound may be employed, e.g. CuO, CuCO3, Cu(OH)2. The silver compound is normally AgNO3, and any convenient Cr (VI) compound, e.g. CrO3 may be used. CO is converted, by the above process, to carbon dioxide, which may be removed using active carbon impregnated with monoethanolamine. The gases are preferably oxidized at a temperature of at least 50‹ C. In the removal of CO, sufficient oxygen may be supplied to the gas mixture to convert all of the carbon monoxide to carbon dioxide at a sufficiently high temperature to maintain the efficiency of the impregnated support. This oxygen may be supplied as air, and may be already present in the mixture. The support may be activated carbon, and the exhausted, impregnated support may be regenerated with an O2-containing gas, e.g. air, at an elevated temperature (e.g. 170-190‹ C.), and re-used. |
