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(Moderator) 07-22-00 13:50 No 31806 |
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Publication :CE Date :January, 2000 file=CE-107-01 Copyright :Copyright 2000 Chemical Week Publishing, LLC Volume :107 Issue :1 Page :17-25 Section :CHEMENTATOR Photosensitive catalyst sees the light Edited by Gerald Parkinson The anatase form of titania can be used as a photosensitive catalyst for oxidation and reduction reactions, but its capability is limited because it is activated only by the absorption of ultraviolet light. Now, a titania catalyst that is activated by visible light -- about 45% of the light energy from the sun -- has been developed by EcoDevice Co. (Tokyo; 731) in cooperation with Kinki University (Higashi-Hiroshima). The catalyst is made by reducing titania at just below 500°C, using a 100 - 500 W microwave plasma for 1060 min. The process takes place under hydrogen gas flow at 12 Torr. In tests, the new catalyst has decomposed aldehydes almost twice as fast as a conventional titania catalyst, the company says. Also, it has achieved 20% destruction of oxides of nitrogen (NOx) with visible light, versus 5% for conventional titania, without sacrificing the normal oxidation efficiency of 35-40% with UV light. EcoDevice will start marketing the new catalyst in April from a 1.2-m.t./yr pilot plant. The price will be around $300/kg. WISDOMwillWIN |
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