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for acetaldehyde which is 2-3 times greater than that achieved by conventional catalysts. Japan Chemical Week, 15 Sep 2005, 46 (2334), 2 Visible light photocatalytic titania developed Sekisui Jushi (Japan) has developed a type of titania photocatalyst which responds to visible light. It incorporates iron and sulfur. It is very effective for decomposing formaldehyde. Japan Chemical Week, 6 Oct 2005, 46 (2337), 2
Chemical reactions involving photocatalysts now make various selfcleaning surfaces possible. The construction and prefabricated building industries are particularly confident that this technology will open up new market opportunities. Cement surfaces that have been treated with a photocatalytic material are self-cleaning in that materials cannot adhere to them. Kemira's titanium dioxide research has increasingly shifted towards developing applications. It is believed that the capacity for self-cleaning will have a profound impact on the construction industry in terms of its aesthetic image.
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removal of carbon dioxide from flue gas is facilitated via an enzymecatalyzed bicarbonate solution developed by Carbozyme. ExxonMobil is developing silicatebased zeolites as possible membrane separation materials. The advantages of membrane separation over alternative techniques are noted.