Washcoat Overlayer for Improved Activity and Stability of Natural Gas Vehicle Monolith Catalysts Operating in the Presence of H2O and SO2

A γ-AlOOH/γ-Al2O3 washcoat overlayer, applied to a PdO(Pt/CeO2)/γ-AlOOH/γ-Al2O3 on cordierite (2MgO·2Al2O3·5SiO2) mini-monolith catalyst (400 cells per square inch, 1 cm diameter × 2.5 cm length), ...