Preparation of beta-coated cordierite honeycomb monoliths by in situ synthesis

NOx conversion of 70% with 0.5 wt.% Pt-beta-coated monolith has been reached at 210 °C under a simulated diesel exhaust (5600 h−1) containing 1000 ppm NOx, 1500 ppm C3H6 and 5% O2 in He. This value is similar to the previously observed for Pt-beta powder catalysts.