IMPREGNATED CHARCOAL FOR REMOVAL OF LOW-DENSITY NITROGEN OXIDE, ITS REGENERATION, IMPREGNATED CHARCOAL FILTER FOR REMOVAL OF LOW-DENSITY NITROGEN OXIDE, AND AIR-CONDITIONER WITH FUNCTION FOR REMOVING LOW-DENSITY NITROGEN OXIDE

摘要

PROBLEM TO BE SOLVED: To provide an impregnated charcoal which is capable of efficiently removing lean nitrogen oxide and is suited for air-conditioning for a long term by adding an organic metal complex whose center metal has an oxidation reduction potential falling within a specific range with a saturated calomel electrode to the activated carbon. SOLUTION: To make the surface of activated carbon electron-donative, a saturated solution obtained by dissolving an organic metal complex whose center metal has an oxidation reduction potential of 0.1-1.5V with a saturated calomel electrode in an organic solvent such as acetone, and to the surface of particulate activated carbon is impregnated with the solution to obtain an impregnated charcoal 1. When soaking the particulate activated carbon into a saturated solution of organic metal complex, acetone boils to cause the organic metal complex to be adsorbed into the surface of the activated carbon, resulting in the dilution of the solution. Therefore, the soaking process is performed while the saturated solution is circulated. After that, the activated carbon is retrieved with a mesh and the acetone is dried. Thus it is possible to obtain an impregnated charcoal which is capable of efficiently removing lean nitrogen oxide of the ppm level and is suited for air-conditioning.