Improved three-way catalysts

A catalyst composition comprising:

• a) a platinum group metal comprising rhodium, platinum, or a combination thereof,
• b) a metal-oxide promoter, wherein the metal in the metal-oxide promoter is selected from magnesium, iron, nickel, or any combination thereof, and
• c) a support,
• wherein the total amount of the platinum group metal is in the range of 0.1 to 10 wt. %, based on the total weight of the catalyst composition,
• wherein the total amount of the promoter, in an oxide form is in the range of 0.2 to 6.0 wt. %, based on the total weight of the catalyst composition,
• wherein the total amount of support is in the range of 84 to 99.3 wt. %, based on the total weight of the catalyst composition,
• wherein the support is selected from a rare earth metal-oxide doped zirconia solid solution, a ceria-alumina composite, rare earth metal-oxide doped ceria-zirconia solid solution or a combination thereof,
• wherein the platinum group metal and promoter are co-impregnated on the support or acid-base reactive impregnated on the support.