A novel catalytic activity of Ce-Zr-Mn-O_x mixed oxides for low temperature selective catalytic reduction of NO with NH_3

摘要

A Ce-Zr-Mn-O_x (CZM) catalyst has been discovered for selective catalytic reduction of NO_x with NH3 in the presence of O_2. In this paper, The catalysts of CZM with 10-50 wt% MnO_2 content and Ce-Zr-O_2 (CZ) catalyst are prepared by hydrothermal synthesis method. The catalytic activity of CZM catalysts at different temperatures, different space velocities and different ratios of NH_3/NO are studied. The results show that the catalyst of CZM with 40 wt% MnO_2 content yields higher NO conversion at low temperature than others. This catalyst shows nearly 90% NO* conversion in a temperature range of 150°C~250°C at a space velocity of 53000 h~(-1).