Ceo₂ Based Catalysts for the Treatment of Propylene in Motorcycle's Exhaust Gases.

In this work, the catalytic activities of several single metallic oxides were studied for the treatment of propylene, a component in motorcycles' exhaust gases, under oxygen deficient conditions. Amongst them, CeO₂ is one of the materials that exhibit the highest activity for the oxidation of C₃H₆. Therefore, several mixtures of CeO₂ with other oxides (SnO₂, ZrO₂, Co₃O₄) were tested to investigate the changes in catalytic activity (both propylene conversion and CO₂ selectivity).

The Influence of Deposition Methods of Support Layer on Cordierite Substrate on the Characteristics of a MnO₂-NiO-Co₃O₄/CeZrO₂/Cordierite Three Way Catalyst.

This paper compares different coating methods ( solid combustion, hybrid deposition, secondary growth on seed, suspension, double deposition of wet impregnation and suspension) to deposit CeZrO₂ 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 m²/g, combined with a dense and crack free surface.