PURPOSE: To perfectly purify gas by directly forming a free radical in contaminated gas to allow the same to act on the gaseous contaminant and malodorous substance therein in a gaseous phase and making the gaseous contaminant incapable of being decomposed in the free radical forming part adsorbed on an adsorbing and decomposing part.
CONSTITUTION: A casing 1 having a contaminated gas inlet 2, a purified gas outlet 3 and a gas passage is provided. A free radical forming part 7 equipped with a free radical forming element forming free radicals containing at least a chain-reactive radical for decomposing the gaseous contaminant or malodorous substance in the contaminated gas is provided on the upstream side in the casing 1. An adsorbing and decomposing part 9 equipped with an adsorbing and decomposing element adsorbing the gaseous contaminant or malodorous substance and the intermediate decomposition product thereof to complete the decomposition of them by said free radical is provided on the downstream side of the free radical forming part 7 in the casing 1. As a result, perfect gas purifying effect and safety can be obtained.
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