Influence of a synthesis method and a support nature on physicochemical and catalytic properties of supported rhodium catalysts for the partial oxidation of hydrocarbons. I. Chloride series

• Published in: Molecular catalysis Vol. 508; p. 111605
• Main Authors: Shefer, K.I., Rogozhnikov, V.N., Larina, T.V., Kovtunova, L.M., Stonkus, O.A., Chetyrin, I.A., Suprun, E.A., Moroz, E.M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2021
• Subjects: Alumina; Catalyst characterization; Partial oxidation of hydrocarbons; Rhodium; Supported catalysts; Supported catalysts; Rhodium; Partial oxidation of hydrocarbons; Alumina; Catalyst characterization
• ISSN: 2468-8231; 2468-8231
• DOI: 10.1016/j.mcat.2021.111605

•The use of RhCl3 and two alumina modifications to prepare the supported catalysts.•Rh-particles with two types of sizes are formed on both alumina supports.•Rh in an oxidized state is located on the surface of reduced metal particles.•The catalyst supported on γ-Al2O3 has more Rh in metal and dispersed states.•Small Rh particles form on θ-Al2O3 in the reaction due to redispersion or sintering. Rhodium catalysts supported on bayerite and pseudoboehmite alumina, calcined at 800 °С, were synthesized and tested in the partial oxidation of methane. Rhodium (III) chloride was used as an active component precursor. The supports and catalysts were investigated by a wide range of physicochemical methods: XRD, SEM and HR TEM, XPS and UV–vis DRS. In both cases, large rhodium particles with a coherent scattering region size of 15–19 nm are formed, and small ones with dimensions less than 1 nm. On the whole, smaller rhodium particles are formed on the bayerite oxide. The catalyst with pseudoboehmite-type support shows better results in the reaction. [Display omitted]