To completely covert benzene into carbon dioxide by photolysis by using platinum-supported titanium dioxide, obtained by irradiating a dispersion liquid containing titanium dioxide and a platinum compound with light, as a photolytic catalyst when an organic compound contained in a gaseous stream is decomposed and removed in the presence of the photolytic catalyst.
When an aromatic hydrocarbon, particularly benzene, contained in the gaseous stream exhausted from a chemical plant and the like is decomposed and removed in the presence of the photolytic catalyst, the aromatic hydrocarbon is converted into carbon dioxide using platinum-supported titanium dioxide obtained by irradiating the dispersion liquid containing titanium dioxide and the platinum compound with light as a photolytic catalyst. It is preferable that the dispersion liquid contains a lower alcohol, suitably ethanol. As the titanium dioxide, anatase-type titanium dioxide, rutile-type titanium dioxide, amorphous titanium dioxide, etc., are usable and as the platinum compound, chloroplatinic acid, platinum acethyl acetonate, etc., are usable.
FUTAMURA SHIN
IBUSUKI AKITSUGU
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