| 摘要 |
PURPOSE:To obtain a catalyst purifying exhaust gas containing nitrogen oxide, carbon monoxide and hydrocarbon. CONSTITUTION:A catalyst for treating exhaust gas is composed of crystalline silicate having an X-ray diffraction pattern and having a chemical formula represented by aR2O[bIr2O3.cMeO3].y-SiO2 (wherein R is an alkali metal ion and/or a hydrogen ion, M is at least one element ion selected from a group cosisting of group VIII elements, a rare earth element, titanium, vanadium, chromium, niobium, antimony, gallium and aluminum, a>=0, b>0, c>=0, b+c=1 and y>11) containing oxides in a mol ratio in a dehydrated state. |
