There is provided a system for decomposing and removing a toxic substance by introducing a gas containing the toxic substance into a reaction apparatus and causing the gas to contact with a heated oxide semiconductor, in which a porous material carrying, as the oxide semiconductor, chromium oxide or nickel oxide is placed in the reaction apparatus, chromium oxide or nickel oxide is thermally excited, and the gas is contacted with the chromium oxide or nickel oxide which is thermally excited. Thus, it is possible to provide a practically useful technique for decomposing and removing a toxic substance with high decomposition/removal efficiency.
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