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Abstract-A new adsorbent for ammonia was developed by chemical treatments of active carbon. From adsorption isotherm observations at 25°C, it was shown that active carbon, which intrinsically little adsorbs ammonia, was improved to adsorb ammonia to various extents up to 8.40 mmol/g at Langmuir's monolayer coverage by oxidation with nitric acid solution and was further promoted by the im-pregnation of metals such as Ni, Co and Cu. The other adsorbents such as silica gel, alumina gel and aluminum oxide hydroxide were comparatively studied. Metal impregnation promoted the adsorptivities of these adsorbents for ammonia as well. Among the tested adsorbents, nickel impregnated oxidized active carbon showed the greatest adsorptivity of 9.4 mmol/g.The cupper impregnated oxidized active carbon was packed in gas mask can-isters and tested for air stream containing ammonia, proving that it serves for longer period than the adsorbents in current use.
Yoshimi Matsumura (Thu,) studied this question.