日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

A maintenance free catalytic deodorant which removes bad smell in living atmosphere have been developed. Ammonia, isovaleric acid and acetic acid were detected as the components of the bad smells from warmed foot in "Kotatsu". Most of these gases were oxidized by noble matal catalyst at 300°C, so that quartz heater coupled with catalyst coating layer (usually heated to 250–400°C) could deodorize such gases easily.

Further study was carried on in order to select an excellent adsorbent which gives adsorbing function to the catalyst coating layer, and we found that copper ion exchanged A-type zeolite has superior absorption ability of trimenthylamine, methylmercaptan and acetic acid. This zeolite-mixed catalyst enables intermittent run of the quartz heater without reducing deodorizing ability. This heater is now applied to refrigerators and air conditioners as deodorant device.