Exhaust gas purifying catalyst and production method thereof

摘要

An object is to maintain an effect of enhancing activity of noble metal particles by transition metal without increasing production cost and an environmental load.;An exhaust gas purifying catalyst 1 is composed of: noble metal particles 2; first compounds 3 which contact the noble metal particles 2 and suppress movement of the noble metal particles 2; and second compounds 4 which contain the noble metal particles 2 and the first compounds 3, suppress the movement of the noble metal particles 2, and suppress coagulation of the first compounds 3 following mutual contact of the first compounds 3, wherein the first compounds 3 support the noble metal particles 2, and simplexes or aggregates of the first compounds 3 supporting the noble metal particles 2 are included in section partitioned by the second compounds 4.

主权项

1. A production method of an exhaust gas purifying catalyst comprising: noble metal particles; first compounds supporting the noble metal particles; and second compounds formed on peripheries of the first compounds on which the noble metal particles are supported and covering both the noble metal particles and the first compounds, wherein simplexes or aggregates of the first compounds supporting the noble metal particles are included in sections partitioned by the second compounds, and the movement of the simplexes or aggregates is suppressed within the sections,
the method comprising: a first step of preparing a composite colloidal solution in which the noble metal particles contact the first compounds; and a second step of forming the second compounds on the peripheries of the first compounds in the colloidal solution, the first compounds being brought into contact with the noble metal particles.