Pt promotional effects on Pd–Pt alloy catalysts for hydrogen peroxide synthesis directly from hydrogen and oxygen

Xu, Jing; Ouyang, Like; Da, Guo-Jin; Song, Qianqian; Yang, Xuejing; Han, Yi‐Fan

doi:10.1016/j.jcat.2011.09.017

Cited by 73 publications

(29 citation statements)

References 42 publications

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“…Edwards et al . were the first to report increased catalytic activity towards H 2 O 2 formation when alloying Au and Pd, building on these initial findings subsequent investigation of Pd‐based, bi‐ and tri‐metallic catalysts for the direct synthesis reaction with numerous combinations of catalysts since reported, including; Pd−Pt, Pd−Ru, Pd−Rh,, Pd‐Ir and Au−Pd‐Pt ,…”

Section: The Role Of Secondary Metals In the Direct Synthesis Of H2o2mentioning

confidence: 97%

Recent Advances in the Direct Synthesis of H₂O₂

2018

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Hydrogen peroxide (H2O2) is a highly effective, green oxidant that has found application in sectors ranging from the synthesis of fine chemicals and waste stream treatment to the extraction of precious metals and the bleaching of paper pulp and textiles. The growing demand for H2O2 has seen it become one of the 100 most important chemicals in the world. The direct synthesis of H2O2 from H2 and O2 has been a challenge for the scientific community for over 100 years and represents an attractive alternative to the current means of production. Herein we discuss the historical perspective of the direct synthesis process, the recent literature regarding catalyst design and the role of additives as well as the application of H2O2 as an in situ oxidant. We discuss the key problems that remain and conclude that although there has been progress with respect to the selectivity of hydrogen utilisation, there is a need to now concentrate on catalyst activity as the key remaining problem requiring a solution is the concentration of H2O2 that can be achieved, especially in flow reactors.

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Section: The Role Of Secondary Metals In the Direct Synthesis Of H2o2mentioning

confidence: 97%

Recent Advances in the Direct Synthesis of H₂O₂

2018

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“…ics [14][15][16][17][18][19] and oxygenates, [20][21][22] and the combustion of hydrocarbons. [23] The bulk molar ratio between the metals is often critical for the catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Synergetic Behavior of TiO₂‐Supported Pd(z)Pt(1−z) Catalysts in the Green Synthesis of Methyl Formate

et al. 2016

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Methyl formate (MF) is a valuable platform molecule, the industrial production of which is far from being green. In this contribution, TiO2‐supported Pd(z)Pt(1−z) catalysts were found to be effective in the green synthesis of methyl formate (MF)—at T=323 K and ambient pressure—through methanol (MeOH) oxidation. Two series of catalysts with similar bulk Pd/(Pd+Pt) molar ratios, z, were prepared; one by a water‐in‐oil microemulsion (MicE) method and the other by an incipient wetness impregnation (IWI). The MicE method led to more efficient catalysts owing to a weak influence of z on particle size distributions and nanoparticles composition. Pd(z)Pt(1−z)‐MicE catalysts exhibited strong synergistic effects for MF production but weak synergistic effects for MeOH conversion. The catalytic performance of Pd(z)Pt(1−z)‐MicE was superior to that of Pd(z)Pt(1−z)‐IWI catalysts despite the latter displaying synergetic effects during the reaction. The catalytic behavior of TiO2‐supported Pd(z)Pt(1−z) catalysts was explained from correlations between XRD, TEM, and X‐ray photoelectron spectroscopy characterizations.

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“…To achieve high efficiency, direct H 2 O 2 synthesis is generally performed in acidified solvent over supported noble-metal catalysts (Au, Pd, Au-Pd, and Pd-Pt). [4][5][6][7][8][9][10][11] However, the direct synthesis of H 2 O 2 from a H 2 /O 2 mixture catalyzed by metals is quite hazardous, and it is very difficult to directly obtain high-purity and high-concentration H 2 O 2 .Research [12,13] published in the 1960s has demonstrated that H 2 O 2 can be generated in H 2 /O 2 non-equilibrium plasma through free-radical reactions in the absence of any catalyst or chemical. However, this plasma method has not yet drawn much attention, owing to low H 2 O 2 yield (less than ca.…”

mentioning

confidence: 99%

Safe Direct Synthesis of High Purity H₂O₂ through a H₂/O₂ Plasma Reaction

Zhou

Guo

et al. 2013

Angew Chem Int Ed

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Hydrogen peroxide (H 2 O 2 ), the most desired green oxidant, [1] is almost exclusively produced by an anthraquinone (AQ) process. [2] Direct oxidation of H 2 with O 2 has long been considered an ideal alternative for H 2 O 2 production. [3] Extensive studies have been done on direct H 2 O 2 synthesis from a H 2 /O 2 mixture. To achieve high efficiency, direct H 2 O 2 synthesis is generally performed in acidified solvent over supported noble-metal catalysts (Au, Pd, Au-Pd, and Pd-Pt). [4][5][6][7][8][9][10][11] However, the direct synthesis of H 2 O 2 from a H 2 /O 2 mixture catalyzed by metals is quite hazardous, and it is very difficult to directly obtain high-purity and high-concentration H 2 O 2 .Research [12,13] published in the 1960s has demonstrated that H 2 O 2 can be generated in H 2 /O 2 non-equilibrium plasma through free-radical reactions in the absence of any catalyst or chemical. However, this plasma method has not yet drawn much attention, owing to low H 2 O 2 yield (less than ca. 5 %) and safety concerns about the discharge-triggered H 2 /O 2 reaction. [12,14] The content of O 2 must be strictly controlled below 4 mol % in order to prevent explosion and ignition. [15] Our previous research [16] showed that the structure of the plasma reactor played an important role in the direct synthesis of H 2 O 2 . A H 2 /O 2 mixture containing 3 mol % of O 2 reaches 100 % O 2 conversion, but the H 2 O 2 selectivity is only 3.5 % (based on O 2 ) in a single dielectric barrier discharge (SDBD) plasma reactor with a naked metal highvoltage (HV) electrode and an aqueous grounding electrode. On the other hand, 57.8 % O 2 conversion and 56.3 % H 2 O 2 selectivity (based on O 2 ) can be obtained by using a double dielectric barrier discharge (DDBD) plasma reactor with a pyrex-covered metal HV electrode (the pyrex cover acts as an additional dielectric barrier) and an aqueous grounding electrode. Although the selectivity has been greatly improved, the safety concerns and low efficiency, owing to low O 2 content, are still big challenges.Herein, we report an experimental realization of controllable H 2 /O 2 combustion processes by an optimized plasma reactor. High purity (Grade 1 electronic grade H 2 O 2 according to the SEMI standard) and highly concentrated H 2 O 2 solution (ca. 60 wt %) can be directly produced from a H 2 /O 2 mixture without explosion. These results suggest a different mechanism from conventional H 2 /O 2 combustion processes in the H 2 /O 2 plasma reaction. As shown in Scheme 1, the electron activation of H 2 into H is responsible for H 2 O 2 formation. However, the electron activation of O 2 into O and O 2 * (vibrational and electronic excited states) leads to H 2 O formation and explosion of the H 2 /O 2 mixture. Moreover, low-electron-density H 2 /O 2 plasma leads to a low degree of H 2 and O 2 activation, which plays quite a significant role in producing H 2 O 2 and controlling H 2 /O 2 combustion.The plasma reactor used in our experiments is a double aqueous electrode DDBD reactor (Support...

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Pt promotional effects on Pd–Pt alloy catalysts for hydrogen peroxide synthesis directly from hydrogen and oxygen

Cited by 73 publications

References 42 publications

Recent Advances in the Direct Synthesis of H₂O₂

Recent Advances in the Direct Synthesis of H₂O₂

Synergetic Behavior of TiO₂‐Supported Pd(z)Pt(1−z) Catalysts in the Green Synthesis of Methyl Formate

Safe Direct Synthesis of High Purity H₂O₂ through a H₂/O₂ Plasma Reaction

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Pt promotional effects on Pd–Pt alloy catalysts for hydrogen peroxide synthesis directly from hydrogen and oxygen

Cited by 73 publications

References 42 publications

Recent Advances in the Direct Synthesis of H2O2

Recent Advances in the Direct Synthesis of H2O2

Synergetic Behavior of TiO2‐Supported Pd(z)Pt(1−z) Catalysts in the Green Synthesis of Methyl Formate

Safe Direct Synthesis of High Purity H2O2 through a H2/O2 Plasma Reaction

Contact Info

Product

Resources

About

Recent Advances in the Direct Synthesis of H₂O₂

Recent Advances in the Direct Synthesis of H₂O₂

Synergetic Behavior of TiO₂‐Supported Pd(z)Pt(1−z) Catalysts in the Green Synthesis of Methyl Formate

Safe Direct Synthesis of High Purity H₂O₂ through a H₂/O₂ Plasma Reaction