Direct synthesis of hydrogen peroxide over Pd/C catalyst prepared by selective adsorption deposition method

Seungsun, Lee; Jeong, Hwiram; Chung, Young-Min

doi:10.1016/j.jcat.2018.06.024

Cited by 31 publications

(10 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This phenomenon is most often responsible for Pd/C deactivation in liquid-phase reactions. 60 Adsorption of organic compounds on the Pd surface or partial oxidation of Pd nanoparticles as possible reasons for the deactivation can be excluded due to the rigorous posttreatment. In contrast, the 0.1Sn-Pd/C catalyst shows a considerable stability during five cycles under the optimized conditions (Figure S5).…”

Section: Resultsmentioning

confidence: 99%

“…This insignificant deactivation is probably due to the partial leaching of Pd, as ICP-MS reveals that 5.9% of the Pd species has leached into the reaction mixture. This phenomenon is most often responsible for Pd/C deactivation in liquid-phase reactions . Adsorption of organic compounds on the Pd surface or partial oxidation of Pd nanoparticles as possible reasons for the deactivation can be excluded due to the rigorous post-treatment.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effective Control of Particle Size and Electron Density of Pd/C and Sn-Pd/C Nanocatalysts for Vanillin Production via Base-Free Oxidation

Sun

et al. 2020

ACS Catal.

View full text Add to dashboard Cite

The effective control of particle size and electron density of metal active sites is challenging yet important for supported nanoparticles, as size effects and promoter effects play vital roles in heterogeneous catalysis on the nanoscale. In this work, we report Pd/C and Sn-Pd/C nanocatalysts for the base-free aerobic oxidation of vanillyl alcohol to vanillin, a challenging reaction not only in the fundamental research of selective oxidation of alcohols but also for the practical transformation of bio-based alcohols to value-added chemicals. We effectively tuned the mean size of Pd nanoparticles from 1.8 to 6.7 nm by varying the temperature used for catalyst preparation and further modified the electron density of the Pd/C catalyst by adding a SnO2 promoter with different loadings. TEM, HAADF-STEM, XPS, CO chemisorption, and in situ DRIFT-IR of CO adsorption characterizations allowed us to get insight into the unique catalytic properties of Pd nanocatalysts. It was conjectured that the base-free aerobic oxidation of vanillyl alcohol to vanillin over the Pd/C catalyst can be a structure-sensitive reaction and the Pd particle size was decisive for the dispersion of Pd, the proportion of catalytically active Pd0 sites, and the intrinsic turnover frequency (iTOF). The 1 wt % Pd/C (1.8 nm) catalyst showed an iTOF value of 268 h–1 and 100% yield to vanillin at 120 °C, 5 bar of O2, and 20 mg of the catalyst within 9 h. We further demonstrated that Sn4+ ions in SnO2 as an electronic promoter can promote Pd/C activity by the formation of highly active, electron-sufficient Pd0 sites which significantly lowered the apparent activation energy of reaction. The 0.1Sn-Pd/C catalyst showed a higher iTOF value of 458 h–1 and a yield of 100% to vanillin at 120 °C, 3 bar of O2 and 15 mg of the catalyst within 6 h. Moreover, we verified a satisfying reusability and an adequate substrate scope over the 0.1Sn-Pd/C catalyst.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effective Control of Particle Size and Electron Density of Pd/C and Sn-Pd/C Nanocatalysts for Vanillin Production via Base-Free Oxidation

Sun

et al. 2020

ACS Catal.

View full text Add to dashboard Cite

show abstract

“…In 2018, a Pd/C catalyst was synthesized by selective adsorption deposition, in which a cationic palladium precursor such as [Pd(NH 3 ) 4 ] 2+ was selectively adsorbed on a negatively charged activated carbon surface and subsequently slowly converted to palladium hydroxide with urea [191]. The formation of ultra-small and monodispersed Pd nanoparticles with a high Pd 2+ /Pd 0 ratio resulted in high initial H 2 O 2 productivity (8606 mmol H 2 O 2 /g Pd h) and selectivity (95.1%).…”

Section: Effect Of Synthetic Methodsmentioning

confidence: 99%

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

et al. 2019

View full text Add to dashboard Cite

The reaction between hydrogen and oxygen is in principle the simplest method to form hydrogen peroxide, but it is still a “dream process”, thus needing a “dream catalyst”. The aim of this review is to analyze critically the different heterogeneous catalysts used for the direct synthesis of H2O2 trying to determine the features that the ideal or “dream catalyst” should possess. This analysis will refer specifically to the following points: (i) the choice of the metal; (ii) the metal promoters used to improve the activity and/or the selectivity; (iii) the role of different supports and their acidic properties; (iv) the addition of halide promoters to inhibit undesired side reactions; (v) the addition of other promoters; (vi) the effects of particle morphology; and (vii) the effects of different synthetic methods on catalyst morphology and performance.

show abstract

“…As an effective and eco-friendly oxidant, hydrogen peroxide (H 2 O 2 ) has attracted worldwide attention in various industrial fields. − The active oxygen content per H 2 O 2 molecule is as high as 47%, with only water forming as a byproduct after the oxidation reaction. In addition, with the exception of H 2 O 2 , most oxidants, including halogen-based gases (F 2 , Cl 2 , Br 2 , and I 2 ), NaClO-, HNO 3 -, SO 2 -, and Cr-based hexavalent chromium (CrO 3 ), manganite (MnO 4 2– ), and metal tetroxide (RuO 4 , and OsO 4 ), inevitably generate harmful byproducts (e.g., halide ions, NO x , sulfur, and metal ions).…”

Section: Introductionmentioning

confidence: 99%

Tailored Palladium–Platinum Nanoconcave Cubes as High Performance Catalysts for the Direct Synthesis of Hydrogen Peroxide

Han

Xiao

Hong

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

To obtain high catalytic properties, finely modulating the electronic structure and active sites of catalysts is important. Herein, we report the design and economical synthesis of Pd@Pt core–shell nanoparticles for high productivity in the direct synthesis of hydrogen peroxide. Pd@Pt core–shell nanoparticles with a partially covered Pt shell on a Pd cube were synthesized using a simple direct seed-mediated growth method. The synthesized Pd@Pt core–shell nanoparticles were composed of high index faceted Pt on the corners and edges, while the Pd–Pt alloy was located on the terrace area of the Pd cubes. Because of the high-indexed Pt and Pd–Pt alloy sites, the synthesized concave Pd@Pt7 nanoparticles exhibited both high H2 conversion and H2O2 selectivity compared with Pd cubes.

show abstract

Direct synthesis of hydrogen peroxide over Pd/C catalyst prepared by selective adsorption deposition method

Cited by 31 publications

References 65 publications

Effective Control of Particle Size and Electron Density of Pd/C and Sn-Pd/C Nanocatalysts for Vanillin Production via Base-Free Oxidation

Effective Control of Particle Size and Electron Density of Pd/C and Sn-Pd/C Nanocatalysts for Vanillin Production via Base-Free Oxidation

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

Tailored Palladium–Platinum Nanoconcave Cubes as High Performance Catalysts for the Direct Synthesis of Hydrogen Peroxide

Contact Info

Product

Resources

About