Direct Synthesis of Hydrogen Peroxide over Au‐Pd Catalyst—The Effect of Co‐Solvent Addition

Paunovic, V.; Sushkevich, Vitaly L.; Schouten, J.C.; Nijhuis, T.A.

doi:10.1002/cctc.201500050

Cited by 23 publications

(20 citation statements)

References 39 publications

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“…[39,41] With Paunovic et al providing a comprehensive study on the choice of co-solvent. [42] In particular, methanol has been widely studied as a co-solvent, due to increased reactant solubility but also as it results in the suppression of H2O2 decomposition. [35] Furthermore, the key role of the solvent has been recently elucidated by Wilson and Flaherty, with the presence of protic solvents, such as water and methanol shown to be key to H2O2 production.…”

Section: Resultsmentioning

confidence: 99%

Direct Synthesis of Hydrogen Peroxide over Au–Pd Supported Nanoparticles under Ambient Conditions

Santos

Lewis

Malta

et al. 2019

Ind. Eng. Chem. Res.

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The direct synthesis of hydrogen peroxide (H 2 O 2 ) from molecular H 2 and O 2 over Au−Pd/TiO 2 catalysts prepared using a modified impregnation methodology is studied. Initially we investigated the role of the Au:Pd ratio on the catalytic activity toward H 2 O 2 formation and its subsequent degradation under conditions that have previously been found to be optimal for the formation of H 2 O 2 using high pressure reactants and low temperatures. Subsequently, we have conducted a detailed study of H 2 O 2 synthesis under ambient conditions which are both more challenging for achieving high yields of H 2 O 2 but more likely to be used for future industrial applications.

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Section: Resultsmentioning

confidence: 99%

Direct Synthesis of Hydrogen Peroxide over Au–Pd Supported Nanoparticles under Ambient Conditions

Santos

Lewis

Malta

et al. 2019

Ind. Eng. Chem. Res.

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“…The evident acceleration effect of EtOAc in the system is another issue to be investigated. According to the literature, organic solvents could improve conversion yields and selectivity of chemical reactions by increasing interactions between reactants and catalyst surfaces . We speculate that the accelerated antimicrobial function of EtOAc in the solution systems is caused by its good affinity with both MSB and E.…”

Section: Resultsmentioning

confidence: 80%

“…According to the literature, organic solvents could improve conversion yields and selectivity of chemical reactions by increasing interactions between reactants and catalyst surfaces. 46 We speculate that the accelerated antimicrobial function of EtOAc in the solution systems is caused by its good affinity with both MSB and E. coli bacteria cells, which could serve as a good media by shortening the distance between the bacterial cells and the photoactive aromatic ketones (marked in red in Figure 3a) and promoting contacts between the short-lived triplets or ROS with the bacteria cells. The shortened distance enables the biocidal ROS and oxidative triplet states to diffuse effectively to the target microbes, 47−49 resulting in more efficient microbial inactivation.…”

Section: ■ Introductionmentioning

confidence: 95%

Photoactive Water-Soluble Vitamin K: A Novel Amphiphilic Photoinduced Antibacterial Agent

Zhang

Wisuthiphaet

Nitin

et al. 2021

ACS Sustainable Chem. Eng.

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Menadione sodium bisulfite (MSB), also known as water-soluble vitamin K3 widely used as an animal food additive due to its low toxicity and low cost, is for the first time proven to be photoactive and antibacterial under various photoirradiation sources, evidenced by a computational modeling method and well-designed experiments. MSB demonstrates its robust photoactivity and application potential under ultraviolet A (UVA, 315–400 nm) irradiation. The results reveal that MSB could effectively generate reactive oxygen species (ROS) under UVA irradiation due to the formation of its oxidative triplet excited state. The photoinduced antibacterial tests also demonstrate the nonselective bacterial inactivation functions of MSB under proper photoirradiation. MSB was challenged against Gram-negative Escherichia coli (E. coli) and Gram-positive Listeria innocua (L. innocua) under UVA irradiation and exhibited excellent antibacterial performance (99.999% bacterial inactivation in 30 min of UVA exposure) in PBS. The antibacterial performance of MSB does not decay after five times of repeated exposures to bacteria and UVA irradiation, indicating the photostability and durability of MSB as a photoinduced antibacterial agent. More interestingly, solvents played a significant role in photoinduced antibacterial properties but not in the generation of ROS of MSB, indicating that the solvents may serve as contact media between MSB and bacteria cells. Intimate contact of MSB and microorganisms is thought of as a determinant in the bacterial inactivation by ROS or triplet excited states due to their relatively short lifetime and limited diffusion and function radius.

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“…Previous evidence from the bulk gold powder-catalyzed reaction suggested that the first step involved the oxidative dehydrogenation of the amine substrate to give the imine (2) [38,39]. In this and subsequent oxidation steps, it is assumed that H2O is the coproduct because H2O2 was not detected in the final reaction mixture; moreover, H2O2 would likely decompose to H2O and O2 under the conditions of the reaction [52].…”

Section: Reaction Pathways For the Formation Of Lactams From Cyclic Smentioning

confidence: 99%

Aerobic Oxidation of Cyclic Amines to Lactams Catalyzed by Ceria-Supported Nanogold

et al. 2016

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The oxidative transformation of cyclic amines to lactams, which are important chemical feedstocks, is efficiently catalyzed by CeO2-supported gold nanoparticles (Au/CeO2) and Aerosil 200 in the presence of an atmosphere of O2. The complete conversion of pyrrolidine was achieved in 6.5 h at 160 °C, affording a 97 % yield of the lactam product 2-pyrrolidone (γ-butyrolactam), while 2-piperidone (δ-valerolactam) was synthesized from piperidine (83 % yield) in 2.5 h. Caprolactam, the precursor to the commercially important nylon-6, was obtained from hexamethyleneimine in 37 % yield in 3 h. During the oxidation of pyrrolidine, two transient species, 5-(pyrrolidin-1-yl)-3,4-dihydro-2H-pyrrole (amidine-5) and 4-amino-1-(pyrrolidin-1-yl)butan-1-one, were observed. Both of these compounds were oxidized to 2-pyrrolidone under catalytic conditions, indicating their role as intermediates in the reaction pathway. In addition to the reactions of cyclic secondary amines, Au/CeO2 also efficiently catalyzes the oxidation of Nmethyl cyclic tertiary amines to the corresponding lactams at 80 and 100 °C.

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Direct Synthesis of Hydrogen Peroxide over Au‐Pd Catalyst—The Effect of Co‐Solvent Addition

Cited by 23 publications

References 39 publications

Direct Synthesis of Hydrogen Peroxide over Au–Pd Supported Nanoparticles under Ambient Conditions

Direct Synthesis of Hydrogen Peroxide over Au–Pd Supported Nanoparticles under Ambient Conditions

Photoactive Water-Soluble Vitamin K: A Novel Amphiphilic Photoinduced Antibacterial Agent

Aerobic Oxidation of Cyclic Amines to Lactams Catalyzed by Ceria-Supported Nanogold

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