| 摘要 |
PURPOSE:To decompose nitrogen oxide at relatively low temp. and to make a process compact by catalytically reacting nitrogen oxide in combustion exhaust gas with an iron silicate catalyst and a hydrocarbon reducing agent to decompose and remove the same. CONSTITUTION:Nitrogen oxide such as nitrogen monoxide or nitrogen dioxide, oxygen gas or sulfur dioxide is usually contained in the combustion gas of a gas turbine. At the time of the decomposition of this combustion gas, iron silicate used as a catalyst has a crystalline structure wherein an iron atom is substituted within a silicate skeleton in the form of a solid solution and the Si/Fe ratio thereof is 10-60. As a hydrocarbon reducing agent, propylene, ethylene, methane, ethane, propane, butane or the like are disignated. Combustion exhaust gas containing nitrogen oxide, oxygen and, if necessary, sulfur dioxide is catalytically reacted with the iron silicate catalyst and the hydrocarbon reducing agent to decompose and remove nitrogen oxide. |
