Au-Ru/TiO2 prepared by deposition-precipitation with urea: Relevant synthesis parameters to obtain bimetallic particles - Archive ouverte HAL
Article Dans Une Revue Applied Catalysis B: Environmental Année : 2020

Au-Ru/TiO2 prepared by deposition-precipitation with urea: Relevant synthesis parameters to obtain bimetallic particles

Résumé

Although Au and Ru are not miscible in the bulk, the paper focusses on the attempts to prepare bimetallic Au-Ru/TiO2 catalysts by deposition-precipitation with urea (co-DPU and sequential DPU, Au then Ru and vice versa). Gold was found already reduced after the preparations of co-DPU and Ru then Au DPU, leading to large gold particles and to catalysts as poorly active as Ru/TiO2 in CO oxidation. The Au-Ru/TiO2 catalysts prepared by Au then Ru DPU provided the most interesting results: small bimetallic particles were formed; after reduction in H2 at 300 °C, their structure was Janus-type and Au core - Ru shell, and the catalyst was poorly active, whereas after reduction at 500 °C, the particles became mainly Ru core - Au shell, and the catalyst showed higher activity than Au/TiO2 and a synergetic effect in CO oxidation compared to the monometallic counterparts.

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Dates et versions

hal-04025207 , version 1 (12-03-2023)

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Lina Calzada, Catherine Louis, Chang Wan Han, Volkan Ortalan, Rodolfo Zanella. Au-Ru/TiO2 prepared by deposition-precipitation with urea: Relevant synthesis parameters to obtain bimetallic particles. Applied Catalysis B: Environmental, 2020, 264, pp.118503. ⟨10.1016/j.apcatb.2019.118503⟩. ⟨hal-04025207⟩
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