Patent ID: 7700514

Claim:
A catalyst comprising at least one porous support, platinum, and rhodium, said catalyst having been prepared by a method comprising: a) impregnation of the support with at least one solution containing a platinum precursor, b) activation of resultant impregnated support from step (a) in a neutral or oxidising atmosphere, at a temperature of between 120 and 800° C., c) further activation in a reducing medium, at a temperature of between 0 and 800° C., d1) impregnation of catalyst from step (c) with an aqueous solution and d2) treatment with at least one hydrogen donor compound at a temperature of less than 200° C., the order in which steps d1) and d2) are carried out being optional, provided that said steps are carried out after said step c) and before step e) which follows, e) impregnation of the support, impregnated with platinum, with at least one solution containing a rhodium precursor, and f) activation of catalyst from step e) in a neutral, reducing or oxidising atmosphere, at a temperature of between 100 and 800° C.