Promotional effects of Au in Pd–Au bimetallic catalysts supported on activated carbon cloth (ACC) for direct synthesis of H2O2 from H2 and O2

Dynamic structural changes of supported Pd, PdSn, and PdIn nanoparticles during continuous flow high pressure direct H2O2synthesis

“…The high activity of the catalyst means that the maximum H 2 O 2 productivity was limited by the availability of reactants and could be achieved at H 2 : O 2 ratio 1 : 1 (as the maximum amount of the gases was dosed in this experiment) for Pd/s- Although the setup was optimized for spectroscopy, the obtained productivities are, to our knowledge, among the highest published in the literature. They are at least three times higher than productivities obtained in (semi-)batch reactors as reviewed by Edwards et al 1 and only two times lower than productivities reported by Gudarzi et al 33 over Pd and PdAu supported on activated carbon cloth. Since in our case H 2 O 2 production rates were limited not by kinetics but by the concentrations of dissolved gases (max.…”

“…In this work supported monometallic Pd and bimetallic PdSn and PdIn NPs were used as model catalysts and systematically tested in the continuous direct synthesis of H 2 O 2 in the liquid phase at 80 bar and H 2 : O 2 ratios varying from strongly reducing to strongly oxidizing conditions. The observed H 2 O 2 production rates are among the highest rates compared to recent literature, 1,33 despite the employment of an in situ XAS cell as the reactor. Due to this compromise it could not be perfectly operated in the kinetic regime and the activity was limited by the supply of reagents (in most of the cases at nearly 100% conversion of the limiting reactant).…”

Looking for the “Dream Catalyst” for Hydrogen Peroxide Production from Hydrogen and Oxygen

“…Gudarzi et al [68] investigated the promotional effects of gold in Pd-Au bimetallic catalysts prepared by simultaneous co-impregnation on activated carbon cloth. Almost all of the Pd-Au bimetallic catalysts were more selective than Pd monometallic catalysts.…”

Theoretical Studies on the Direct Propylene Epoxidation Using Gold-Based Catalysts: A Mini-Review

“…This would potentially reduce OOH decomposition to O on the Au surface, leading to more PO production. Additionally, it is proposed that bimetallic alloys (e.g., Au-Pd and Au-Ru) or trimetallic alloys (e.g., Au-Pd-Ru) supported on TiO 2 can be highly active for H 2 O 2 production, since this leads to a significant synergistic enhancement in activity (from Pd and Ru) and selectivity (from Au) [148][149][150][151]. Thus, such Au-Pd, Au-Ru, and Au-Pd-Ru alloy nanoparticles loaded on TS-1 support may lead to improved propylene conversion, as well as improved hydrogen utilization efficiency.…”