EXHAUST GAS PURIFICATION CATALYST, EXHAUST GAS PURIFICATION MONOLITH CATALYST, AND METHOD FOR PRODUCING EXHAUST GAS PURIFICATION CATALYST

摘要

Provided is an exhaust gas purification catalyst that exhibits excellent NOx conversion performance in a high temperature range, and exhibits excellent low-temperature activity. The exhaust gas purification catalyst contains, in oxides with particle sizes ranging from 1 to 50 nm and having oxygen adsorbing and releasing capabilities, a first catalyst and a precious metal-containing second catalyst, which are supported by oxides with particle sizes ranging from 1 to 30 nm, said oxides being represented by general formula (1): LaxM1-xM'O3-delta (wherein La represents lanthanum; M represents at least one type of element selected from a group comprising barium (Ba), strontium (Sr) and calcium (Ca); M' represents at least one type of element selected from a group comprising iron (Fe), cobalt (Co), nickel (Ni) and manganese (Mn); delta represents oxygen deficiency; and x and delta satisfy the relationships, 0 < x <= 1 and 0 <= delta <= 1.)