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Iron molybdates for selective oxidation of methanol: Mo excess effects on the deactivation behaviour
Affiliation:1. GRECAT – Grupo de Estudos de Catálise Heterogénea, Universidade Técnica de Lisboa, Instituto Superior Técnico, Avenida Rovisco Pais, Lisboa 1049-001, Portugal;2. ECPM – LERCSI, UMR CNRS 7515, 25 Rue Becquerel, BP08, 67087 Strasbourg Cedex 2, France;1. AGH University of Science and Technology, Faculty of Energy and Fuels, al. A. Mickiewicza 30, 30-059 Cracow, Poland;2. LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-011 Lisboa, Portugal;3. EDF Polska S.A., Department of Research and Development, ul. Ciepłownicza 1, 31-587 Cracow, Poland;1. Centro Atómico Bariloche (CAB), Comisión Nacional de Energía Atómica (CNEA), Av. Bustillo 9500, 8400, S.C. de Bariloche, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, C1033AAJ, Buenos Aires, Argentina;3. Instituto de Física Del Sur (IFISUR), Departamento de Física Universidad Del Sur. Av Alem 1253, Bahía Blanca 8000, Argentina;4. Y-TEC, YPF – TECNOLOGIA, Av. Del Petróleo S/n Entre 128 y 143, 1923, Berisso, Buenos Aires, Argentina
Abstract:Stoichiometric (atomic ratio Mo/Fe=1.5) and industrial like (atomic ratio Mo/Fe=3) iron molybdates have been prepared by coprecipitation and submitted to long catalytic tests to study the effect of Mo excess on the deactivation behaviour during methanol to formaldehyde oxidation. Results show that Mo excess improves catalyst stability mainly due to the fact that during reaction Mo seems to migrate from bulk to catalyst surface and then sublimated.
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