초록 ▼

A catalyst for purifying exhaust gases comprises: a perovskite-type complex oxide represented by the general formula Ln1-xAxMO3, wherein Ln represents at least one rare earth metal, A presents at least one alkaline earth metal and M represents at least one transition metal, and 03, LnAlO3 or Ln2B2O7

A catalyst for purifying exhaust gases comprises: a perovskite-type complex oxide represented by the general formula Ln1-xAxMO3, wherein Ln represents at least one rare earth metal, A presents at least one alkaline earth metal and M represents at least one transition metal, and 03, LnAlO3 or Ln2B2O7, wherein A represents at least one alkaline earth metal, B represents at least one of Ti, Zr and Hf, and Ln represents at least one rare earth metal, and the precious metal is at least one of Pt, Pd, Rh, Ir, Ru and Os. The catalyst is usable as a temperature of 900°C. or above without sintering or reduction of a catalytic activity.

대표청구항 ▼

A catalyst for purifying exhaust gases comprising: (a) at least one heat resistant complex oxide selected from the group consisting of compounds represented by one of ABO3, LnAlO3 and Ln2B2O7, wherein A represents at least one alkaline earth metal, B represents at least one of Ti, Zr and Hf, and Ln

A catalyst for purifying exhaust gases comprising: (a) at least one heat resistant complex oxide selected from the group consisting of compounds represented by one of ABO3, LnAlO3 and Ln2B2O7, wherein A represents at least one alkaline earth metal, B represents at least one of Ti, Zr and Hf, and Ln represents at least one rare earth metal; (b) a perovskite complex oxide in an amount of from 1 to 80 wt.%, said perovskite complex oxide being represented by the general formula Ln1-xAxMO3, wherein Ln represents at least one rare earth metal, A represents at least one alkaline earth metal and M represents at least one transition metal, and 01; and (c) at least one precious metal in an amount of from 0.01 to 2 wt.%.