| abstract |
An exhaust gas treatment method comprising the steps of: adding a 3C-5C olefinic hydrocarbon (unsaturated hydrocarbon) to a combustion exhaust gas that includes SO3 as well as NOx as a first additive; and then contacting the combustion exhaust gas with a catalyst that includes an oxide consisting of one or more elements selected from the group consisting of Ti, Si, Zr and Ce and / or a mixed oxide and / or a complex oxide consisting of two or more of the elements selected from the group as carriers and that does not include a noble metal, and thus SO3 is treated by reduction to SO2. |