Catalyst powder, method of producing the catalyst powder, and exhaust gas purifying catalyst

Catalyst powder, comprising:

• a porous carrier;
• and
• a noble metal particle and a transition metal particle, which are carried on the carrier,
• wherein at least a part of the transition metal particle contacts the noble metal particle, is bound with the carrier to form a composite compound contacting the noble metal particle, or forms a composite particle together with the noble metal particle,
• wherein a particle diameter of the noble metal particle is within a range from 0.1 nm to 10 nm, and a particle diameter of the transition metal particle is within a range from 1 nm to 50 nm.