The application of supported gold catalysts to automotive pollution abatement

• Published in: Catalysis today Vol. 72; no. 1; pp. 145 - 156
• Main Authors: Mellor, J.R, Palazov, A.N, Grigorova, B.S, Greyling, J.F, Reddy, K, Letsoalo, M.P, Marsh, J.H
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.02.2002; Elsevier Science
• Subjects: Catalysis; Catalysts: preparations and properties; Ceria; Chemistry; Exact sciences and technology; General and physical chemistry; Gold catalysts; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Three-way autocatalyst; Titania; Zirconia; Zirconia; Titania; Three-way autocatalyst; Gold catalysts; Ceria; Nitrogen oxide; Cerium Oxides; Air pollution control; Gold; Cobalt Oxides; Gasoline engine; Diesel engine; Transition metal; X ray; Supported catalyst; Titanium Oxides; Chemical reduction; Heterogeneous catalysis; Transmission electron microscopy; Nitric oxide; Three way catalyst; Photoelectron spectrometry; Exhaust gas; Zirconium Oxides; Flue gas purification
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/S0920-5861(01)00488-6

A gold based catalyst was formulated for use as a three-way catalyst in gasoline and diesel applications. The catalyst was comprised of gold supported on cobalt oxide, which acted as promoter. The gold–cobalt oxide clusters had particle sizes of approximately 40–140 nm, and were supported on a mechanical mixture of zirconia-stabilised ceria, zirconia and titania. Under gasoline conditions at sub-stoichiometric and super-stoichiometric oxygen concentrations, fresh catalysts displayed a hydrocarbon T 50 of 240 °C, a CO T 50 of 85 °C and a NO x T 50 of 310 °C. After testing at temperatures of 500 °C over periods of up to 157 h, the activity of the catalyst decreased.