Effects of varying amounts of Na on Pd/TiO2 for the direct synthesis of H2O2: Identification of the Pd dispersion and catalytic activity enhancement by changing the surface electronic states

The direct synthesis of hydrogen peroxide has been for about 20 years a hot topic in “green” catalysis. Several methods, which are well established to measure the concentration of hydrogen peroxide in water are also applied to the analysis of reaction mixtures from the direct synthesis of H2O2. However, this step could not be always straightforward, because these mixtures contain almost invariably organic solvents and, sometimes, selectivity enhancers which can interfere in some, at the least, of the most popular titrimetric methods. This work presents a comparative investigation of iodometry, cerimetry, permanganometry (titrimetric methods) and spectrophotometric analysis of TiIV/H2O2 adduct, as applied to analysis of hydrogen peroxide produced by its direct synthesis. They account for more than 90 % of the competent literature since 2000. Their pros and cons are highlighted to provide a guideline for the choice of the best possible method of analysis and for the comparison of catalytic results assessed in different ways in the context of the direct synthesis of hydrogen peroxide.

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Comparing Catalysts of the Direct Synthesis of Hydrogen Peroxide in Organic Solvent: is the Measure of the Product an Issue?

Sandri

Danieli

Zecca

et al. 2021

ChemCatChem

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Recent progress of noble metals with tailored features in catalytic oxidation for organic pollutants degradation

Yin

Qin

et al. 2022

Journal of Hazardous Materials

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Boosted H₂O₂ Productivity by Sulfur-Doped Pd/Carbon Catalysts via Direct Synthesis from H₂ and O₂ at Atmospheric Pressure

Wang

Jiang

Yang

et al. 2022

ACS Sustainable Chem. Eng.

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It remains a challenge nowadays in the development of highly efficient catalysts for the direct synthesis of H 2 O 2 from H 2 and O 2 . In this work, we developed sulfur-doped carbon-supported Pd catalysts and systematically investigated sulfur effects on catalytic performances through various characterizations (transmission electron microscopy (TEM), N 2 adsorption−desorption, H 2 -temperature-programmed reduction (TPR)/temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), etc.). Results showed that sulfur species promoted the in situ formation of Pd nanoparticles and enhanced their dispersion on the supports. Due to the synergistic combination of active metal and support, the catalytic performance has been improved significantly in the direct synthesis of H 2 O 2 . The catalyst doped with the highest sulfur content showed the highest H 2 O 2 productivity of 7148 mmol g Pd −1 h −1 , which was nearly 4 times higher than the catalyst without sulfur doping.

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Effects of varying amounts of Na on Pd/TiO2 for the direct synthesis of H2O2: Identification of the Pd dispersion and catalytic activity enhancement by changing the surface electronic states

Cited by 3 publications

References 42 publications

Comparing Catalysts of the Direct Synthesis of Hydrogen Peroxide in Organic Solvent: is the Measure of the Product an Issue?

Comparing Catalysts of the Direct Synthesis of Hydrogen Peroxide in Organic Solvent: is the Measure of the Product an Issue?

Recent progress of noble metals with tailored features in catalytic oxidation for organic pollutants degradation

Boosted H₂O₂ Productivity by Sulfur-Doped Pd/Carbon Catalysts via Direct Synthesis from H₂ and O₂ at Atmospheric Pressure

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Effects of varying amounts of Na on Pd/TiO2 for the direct synthesis of H2O2: Identification of the Pd dispersion and catalytic activity enhancement by changing the surface electronic states

Cited by 3 publications

References 42 publications

Comparing Catalysts of the Direct Synthesis of Hydrogen Peroxide in Organic Solvent: is the Measure of the Product an Issue?

Comparing Catalysts of the Direct Synthesis of Hydrogen Peroxide in Organic Solvent: is the Measure of the Product an Issue?

Recent progress of noble metals with tailored features in catalytic oxidation for organic pollutants degradation

Boosted H2O2 Productivity by Sulfur-Doped Pd/Carbon Catalysts via Direct Synthesis from H2 and O2 at Atmospheric Pressure

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Product

Resources

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Boosted H₂O₂ Productivity by Sulfur-Doped Pd/Carbon Catalysts via Direct Synthesis from H₂ and O₂ at Atmospheric Pressure