A novel method based on flame hydrolysis of aqueous solutions of precursors has been set up for preparing perovskite-type mixed oxide catalysts in nanometer size particles of high surface area and high thermal stability. After optimising the shape and size of the various parts of the equipment and all the operational parameters, the method has been applied to the preparation of a series of samples of general formula La1-xMxCoO3+δ, with x = 0, 0.1 and M = Ce, Eu. Perfectly crystalline powders, made of 200-600 Å microspherical particles, generally clustered into 100-500 nm conglomerates, with SBET typically of 20-30 m2/g, were obtained. The catalysts proved highly thermally resistant and up to one order of magnitude more active than samples of identical composition, but prepared through traditional methods, allowing to attain 100% methane conversion at temperature as low as 560°C.

A new method for preparing nanometer-size perovskitic catalysts for CH4 flameless combustion / R.A.M. Giacomuzzi, M. Portinari, I. Rossetti, L. Forni (STUDIES IN SURFACE SCIENCE AND CATALYSIS). - In: Studies in Surface Science and Catalysis / [a cura di] A. Corma, F.V. Melo, S. Mendioroz, J.L.G. Fierro. - [s.l] : Elsevier, 2000. - ISBN 9780444504807. - pp. 197-202 (( Intervento presentato al 12. convegno International Congress on Catalysis tenutosi a Granada nel 2000 [10.1016/S0167-2991(00)80956-8].

A new method for preparing nanometer-size perovskitic catalysts for CH4 flameless combustion

I. Rossetti;L. Forni
2000

Abstract

A novel method based on flame hydrolysis of aqueous solutions of precursors has been set up for preparing perovskite-type mixed oxide catalysts in nanometer size particles of high surface area and high thermal stability. After optimising the shape and size of the various parts of the equipment and all the operational parameters, the method has been applied to the preparation of a series of samples of general formula La1-xMxCoO3+δ, with x = 0, 0.1 and M = Ce, Eu. Perfectly crystalline powders, made of 200-600 Å microspherical particles, generally clustered into 100-500 nm conglomerates, with SBET typically of 20-30 m2/g, were obtained. The catalysts proved highly thermally resistant and up to one order of magnitude more active than samples of identical composition, but prepared through traditional methods, allowing to attain 100% methane conversion at temperature as low as 560°C.
Settore CHIM/02 - Chimica Fisica
2000
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/428914
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