The Influence of Deposition Methods of Support Layer on Cordierite Substrate on the Characteristics of a MnO(2)–NiO–Co(3)O(4)/Ce(0.2)Zr(0.8)O(2)/Cordierite Three Way Catalyst

This paper compares different coating methods (in situ solid combustion, hybrid deposition, secondary growth on seed, suspension, double deposition of wet impregnation and suspension) to deposit Ce(0.2)Zr(0.8)O(2) mixed oxides on cordierite substrates, for use as a three way catalyst. Among them, the double deposition was proven to be the most efficient one. The coated sample shows a BET (Brunauer–Emmett–Teller) surface area of 25 m(2)/g, combined with a dense and crack free surface. The catalyst with a layer of MnO(2)–NiO–Co(3)O(4) mixed oxides on top of the Ce(0.2)Zr(0.8)O(2)/cordierite substrate prepared by this method exhibits good activity for the treatment of CO, NO and C(3)H(6) in exhaust gases (CO conversion of 100% at 250 °C, C(3)H(6) conversion of 100% at 400 °C and NO conversion of 40% at 400 °C).