Gold silver core shell nanoparticles3/30/2023 ![]() ![]() The authors have been studying the preparation of the noble metal NPs by the effect of ultrasound and reported the sonochemical preparation of Au-core/Pd-shell bimetallic NPs. reported that the higher activity of Pd(shell)–Au(core)/TiO 2 was obtained for toluene and propene oxidation compared to those of Au(shell)–Pd(core) and Pd–Au(alloy). Among them, the distribution of constituent Au and Pd atoms across a bimetallic NP is thought to be one of the important factors determining catalytic properties. Enhancements of the catalytic activities by the addition of Au have been discussed based on the stability, geometric structures of the catalysts, etc. It is interesting that the optimum ratios are comparable irrespective of the reaction systems. also reported that bimetallic NPs of Au/Pd ratio of 19/81 immobilised on rutile TiO 2 showed superior performance for hydrogen peroxide synthesis by hydrogen oxidation with O 2. According to Sarkany et al., Au/Pd molar ratio of 20/80 in core/shell-structured NPs exhibited the highest catalytic activity for the hydrogenation of acetylene. investigated oxidation of benzyl alcohol and reported that admixing Pd to Au resulted in a continuous increase of selectivity to benzaldehyde reaching a maximum with catalysts containing Au/Pd ratio of 1/9. The dependences of the catalytic activities on the Au/Pd ratios of the bimetallic NPs also have been extensively studied. The direct synthesis of hydrogen peroxide and solvent-free oxidation of primary alcohols, which were catalysed by Au/Pd bimetallic NPs, were also reported. The synergistic effects were not observed when SiO 2 was used instead of TiO 2. reported the slight synergetic effect of Au/Pd alloy in the CO oxidation catalysed by Au/Pd bimetallic NPs immobilised on TiO 2. investigated the effect of the addition of Au using acetoxylation of ethylene and concluded that the critical reaction site for vinyl acetate synthesis consisted of two non-contiguous Pd monomers suitably spaced by Au. The synergistic effects of the addition of Au to Pd in enhancing the overall catalytic activity, selectivity and stability of the catalyst have been of great interest. Among bimetallic NPs, Au–Pd NPs have attracted much attention mainly in the field of catalysts. Bimetallic nanoparticles (NPs) have received considerable attention due to their unique properties which are different from pristine characteristics of the constituent monometallic NPs. ![]()
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |