Ceria-promoted three-way catalysts for auto exhaust emission control

Abstract

In an attempt to improve the three-way catalyst (TWC) performance for CO removal under C2-deflcient conditions, a laboratory study was conducted to select a non-noble metal oxide promoter for a typical Pt-Pd-Rh TWC supported on alumina. Ceria was found to be the best promoter largely because it enhances the water-gas shift reaction (CO + H20 = C02 + H2), and possibly due, in part, to the additional oxygen storage it provides to the TWC. The compatibility at high temperatures with alumina as well as Pd is also a desirable property of ceria.

Poly(catechol) Film Modified Glassy Carbon Electrode for Ultratrace Determination of Cerium(III) by Differential Pulse Anodic Stripping Voltammetry

“…It has many industrial applications, e.g., in the areas of lighting and television [1], metallurgy, glass and ceramic [2], as one of the active components of catalytic converter in vehicles [3], etc. Due to its usage in many ®elds of human endeavor, there is a growing need to study the environmental, medical or biological effects of cerium.…”

CuCrO2 Delafossite: A Stable Copper Catalyst for Chlorine Production

“…[14] CuCrO 2 -CeO 2 composites were prepared by mechanochemical activation of CuCrO 2 and CeO 2 powders in different proportions. Catalytic data was acquired after five hour tests at O 2 /HCl = 2 and T bed = 653 K (Figure 3 b).…”

Catalyst Technologies To Meet Future Emission Requirements for Light-Duty Vehicles

“…The Federal government recently tightened the NOx standard from 1.0 to 0.4 g/mile, while California will tighten theirs from 0.4 to 0.2 g/mile beginning in 1997 (ULEV standard). For catalytic NOx control, the use of certain base metals in washcoat formulations are of paramount importance in promoting the activity most commonly used base metal oxide for these purposes (9)(10)(11). Stabilizing rhodium to improve NOx thermal durability performance, has been, and will continue to be a priority in developing improved NOx control catalysts.…”