| 摘要 |
PURPOSE:To decrease nonreacted NH3 and to remove NOx in high degree of conversion by adding 1-3 times mol NH3 for nitrogen oxide to exhaust gas contg. nitrogen oxide and allowing the mixture to catalytically react with a catalyst of specified composition at 330-500 deg.C. CONSTITUTION:A catalyst contg. the following oxides is produced which contains binary composite oxide consisting of Ti and Si and/or ternary composite oxide consisting of Ti, Si and Zr as an A component of the catalyst, oxide of Cu and/or Mn as a B component of the catalyst and furthermore at least one kind of oxide selected from a group consisting of V, W, Mo, Ce and Sn as a C component of the catalyst. 1-3 times mol NH3 for nitrogen oxide is added to exhaust gas contg. nitrogen oxide and the mixture is allowed to catalytically react with the above-mentioned catalyst at 330-500 deg.C temp. and nitrogen oxide is removed in high degree of conversion. |
