An exhaust gas catalyst and method of manufacturing same. The invention provides
for a cost-effective material which lowers the cold-start emissions from the exhaust
of vehicles. The invention is a passive system which accelerates the light-off
temperature of catalyst in a cost-effective fashion. The invention includes a method
of manufacturing an exhaust gas catalyst capable of lowering cold-start emissions
including the steps of providing an oxide mixture having praseodymium and cerium,
doping about 0-10% weight zirconium and about 0-10% weight yttrium to the oxide
mixture, adding about 0-2% weight metal including palladium, platinum, or rhodium
to the oxide mixture, mixing gamma aluminum to the oxide mixture for washcoating
and washcoating the oxide mixture onto a monolithic substrate.
