Patent ID: 7737076

Claim:
A catalyst producing method comprising: preparing a first reverse micellar solution including an aqueous solution containing a first precursor of a noble metal element as a catalytic active component; reducing the noble metal precursor to a noble metal particle by adding a first reducing agent to the first reverse micellar solution; preparing a second reverse micellar solution including an aqueous solution containing a second precursor of a transition metal element as the catalytic active component; reducing the transition metal precursor to a transition metal particle by adding a second reducing agent to the second reverse micellar solution; mixing the first reverse micellar solution containing the noble metal particle and the second reverse micellar solution containing the transition metal particle to obtain a reverse micelle containing the noble metal particle and the transition metal particle; carrying the noble metal particle and the transition metal particle on a substrate to form a catalyst precursor; and spraying an emulsion solution containing the catalyst precursor in an inert gas atmosphere to obtain a dried catalyst precursor; and firing the obtained dried catalyst precursor in an air atmosphere.