Hydrogenation of aromatics over Au-Pd/SiO2-Al2O3 catalysts; support acidity effect

Effect of Y Modified Ceria Support in Mono and Bimetallic Pd–Au Catalysts for Complete Benzene Oxidation

“…These spent samples exhibited a small but still significant decrease of the Au 4f 7/2 binding energy and a splitting of the Pd 3d spectrum into two components, one attributed to oxidized palladium species and the other to a more reduced palladium. The BE typical of metallic Pd is generally around 335 eV [15]. The larger value obtained in the present case could be attributed to a close interaction of the support oxides with palladium.…”

Catalytic oxidation of benzyl alcohol on Au or Au–Pd nanoparticles confined in mesoporous silica

“…The peak at 33.78 was assigned to crystalline PdO. The diffraction peak located between Au(1 1 1) and Pd(1 1 1) was assigned to the Au x Pd y alloy phase [45]. PdO and Pd 0 phases but no Au x Pd y alloy phase were observed in DAuPdS sample.…”

Catalytic Hydrogenation of Hydrocarbons for Gasoline Production

“…Several studies have been performed on hydrogenation, isomerisation and ring opening of aromatics. 75,77,[80][81][82][83][84] Reaction performed by Shimizu et al on benzene hydrogenation and isomerisation using Pt-supported solid acid catalyst at 250°C showed that benzene almost completely converted with all the Pt-supported catalyst. 75 However, reaction without any catalyst and with only sulphated zirconia showed very little hydrogenation.…”

“…82 It was shown that hydrogenation of toluene is more difficult compared with naphthalene because of the decrease in resonance energy per aromatic ring and also differences in π-electrons cloud density due to the attached methyl group. Figure 4 which is abstracted from Venezia et al 82 Au in hydrogenation activity has also been previously claimed because Au d-bands nearly have no ability of dissociate hydrogen molecules. [85][86][87][88][89][90][91] Figure 4: Calculated TOF for the toluene hydrogenation.…”

“…[85][86][87][88][89][90][91] Figure 4: Calculated TOF for the toluene hydrogenation. 82 Lin et al performed the hydrogenation of benzene over Pt dispersed on SiO 2 , η-Al 2 O 3 , SiO 2 -Al 2 O 3 , TiO 2 and powdered Pt catalyst. 77 It was shown that the activation energies and the reaction order of the various reactions were independent of the used support.…”