Harmful cWorine compounds are emitted during thermal decomposition and combustion of plastics containing chlorine. Those compounds lead to the formation of high toxic dioxins, which has recently become a serious public concern in Japan, during an incineration of municipal solid waste. In order to develop new processes for removing chlorine compounds in such waste treatments, a novel iron oxide with high oxidative catalysis was investigated on the basis of three researches as follws. ①Acceleration for combustion and oxidation of hydrocarbons. ②Dehydrochlorination and oxidative decomposition of organic chlorine compounds. ③Capturing HCl.