Patent ID: 7851405

Claim:
An exhaust gas purifying catalyst, comprising: noble metal particles; first compounds contacting and chemically bonding the noble metal particles to suppress movement of the noble metal particles, the first compounds being a composite oxide containing a rare earth element; and second compounds on peripheries of the first compounds on which the noble metal particles are supported, wherein the second compounds contain γ-alumina derived from boehmite, wherein a single piece or aggregate of the first compounds which supports a noble metal particle is fixed in a section partitioned from other pieces or aggregates of first compounds by the second compounds, thereby suppressing movement of the noble metal particle and suppressing coagulation of first compounds with each other, and wherein D2/D3 as a ratio of a secondary particle diameter (D2) of the first compounds with respect to an average pore diameter (D3) of pores of the second compounds is 1 or more.