Patent ID: 8034742
Filing Date: 2011-10-11
Classification: B01D,B01J,C01G,C01P,F01N

Abstract:
1. A method of producing an oxidation catalyst for cleaning exhaust gas, which oxidizes contents in exhaust gas from internal-combustion engines to clean the gas, and which comprises a composite metal oxide including a first metal element Ln, Mn as a second metal element, and a third metal element A, represented by the general formula Ln y Mn 1-x A x O 3 , the method comprising the steps of: selecting one metal element as the first metal element Ln from the group consisting of Sc, Y, Ho, Er, Tm, Yb, and Lu; and selecting one metal element as the third metal element A from the group consisting of Ti, Nb, and Ta; mixing nitrate of the first metal element Ln, manganese nitrate, and oxide of the third metal element A, so that x has a value ranging from 0.005 to 0.2, and y has a value ranging from 0.9 to 1.0, and thereafter performing primary firing; and subjecting a resultant material from the primary firing process to grinding and thereafter performing secondary firing at the range of 600 to 1200° C. for 1 to 5 hours.