Simultaneous use of CO and naphthalene for the reduction of NO on potassium promoted copper catalyst supported on Ce/TiO2-SiO2 and in the presence of oxygen

Abstract A set of Cu/Ce/TiO 2 -SiO 2 and K/Cu/Ce/TiO 2 -SiO 2 catalysts was used for the simultaneous use of CO and naphthalene as reducing agents for the reduction of NO in the presence of oxygen. Only 5% of TiO 2 greatly increase the activity of the catalysts. It was also found that the addition of potassium is able to tune down these oxidation reactions allowing the reduction of NO. The Cu/Ce/TiO 2 -SiO 2 catalyst achieves the full conversion of naphthalene at 302 °C, 96% of CO conversion at the same temperature, and negligible conversion of NO. On the other hand, the K/Cu/Ce/TiO 2 -SiO 2 catalyst reaches the full conversion of CO at 330 °C, 90% conversion of NO at 342 °C, and 70% conversion of naphthalene at the latter temperature.