Contribution of cerium/zirconium mixed oxides to the activity of a new generation of TWC

• Published in: Applied catalysis. B, Environmental Vol. 22; no. 3; pp. 167 - 178
• Main Authors: González-Velasco, Juan R., Gutiérrez-Ortiz, Miguel A., Marc, Jean-Louis, Botas, Juan A., González-Marcos, M.Pilar, Blanchard, Gilbert
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 20.09.1999; Elsevier
• Subjects: Catalysis; Catalysts: preparations and properties; Ceria; Chemistry; Exact sciences and technology; General and physical chemistry; Mixed oxides; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Three way catalysts (TWC); Zirconia; Zirconia; Mixed oxides; Three way catalysts (TWC); Ceria; Ternary compound; Cerium Oxides; Catalytic reaction; Hydrocarbon; Transition metal Compounds; Experimental study; Heterogeneous catalysis; Pore size; Propene; Nitric oxide; Three way catalyst; Oxidation; Zirconium Oxides; Carbon monoxide; Lanthanide Compounds
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/S0926-3373(99)00054-5

The catalytic activity of several cerium/zirconium mixed oxides for TWC applications has been investigated with the aim of optimising the Ce/Zr composition. Their catalytic activity was surprisingly high, considering that no noble metal was present in the composition, particularly for oxidation reactions (CO and C3H6), while their reduction activity was very small (NO). The specific activity of the mixed oxides for CO and C3H6 was found to be the contribution of the individual specific activity of the single oxides. The best activity in practice (lowest T0 and T50 and highest X773) was found for the mixed oxide with a Ce/Zr ratio of 80/20, as a combination of its high specific activity and the highest specific surface area.