AUTOMOBILE EXHAUST GAS PURIFYING CATALYST AND METHOD FOR PRODUCING THE SAME

摘要

An automobile exhaust gas purification catalyst comprised of a support mainly comprised of ZrO 2 in which Rh is supported as a catalyst metal preventing sintering of the support, raising the supporting efficiency, and raising the low temperature activity and a method of production of the same are provided. An automobile exhaust gas purification catalyst comprised of a support mainly comprised of ZrO 2 , sintered under firing conditions where the as fired ZrO 2 will substantially not be charged in a catalyst metal supporting treatment solution, in which Rh is supported as a catalyst metal in a particle state. The method of production includes a step of charging the support mainly comprised of ZrO 2 fired under the above firing conditions by applying at least one treatment of an acid treatment and a base treatment and a step of dipping the charged state support in the catalyst supporting treatment solution including a colloid of Rh as the catalyst metal to make the Rh colloid be adsorbed on the support.