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

Abstract

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.

Progress and perspectives of Pd-based catalysts for direct synthesis of hydrogen peroxide

“…This enhanced their dispersion on the support, significantly improving the catalytic performance of the DSHP. 78…”

“…This enhanced their dispersion on the support, significantly improving the catalytic performance of the DSHP. 78 In addition, Lewis et al found that the supported Pd catalyst modified with N-heterocyclic carbene (NHC) had significant effects on the synthesis of H 2 O 2 from DSHP. 79 And by carefully selecting the N-substituents, the catalytic performance can be greatly improved compared to unmodified catalysts, and a significant concentration of H 2 O 2 can be achieved.…”

Polydopamine-Loaded ZnIn2S4 Photocatalyst for H2O2 Production in Water

“…Hydrogen peroxide (H 2 O 2 ), as an important high-energy chemical resource, is highly valued and widely used as an environmentally friendly oxidant and ideal energy carrier in fields such as chemical production, healthcare, and environmental treatment. − The global demand for H 2 O 2 is increasing and is expected to reach 570 tons per year by 2027 . However, as the main synthesis methods for H 2 O 2 , anthraquinone oxidation exists with problems such as high energy consumption, expensive palladium-based catalysts, consumption of organic reagents and pressurized hydrogen gas, and environmental issues such as the generation of a large amount of wastewater, exhaust gas, and solid waste in the synthesis process. , The high cost and safety issues of other processes, such as alcohol oxidation, direct synthesis of hydrogen and oxygen, and electrochemical methods, limit their large-scale industrial applications. − Therefore, the design of an efficient, safe, economical, and green H 2 O 2 production method with the ability to meet the growing demands of the industry is of great significance.…”

Facet-dependent synthesis of H2O2 from H2 and O2 over single Pt atom-modified Pd nanocrystal catalysts

“…[16][17][18] Despite the above-mentioned advantages, the low yield of H 2 O 2 owing to its thermodynamically favorable side reactions (including the dissociation of O 2 to form H 2 O, H 2 O 2 hydrogenation, and H 2 O 2 decomposition, as shown in Scheme 1) means that the DSHP remains a tremendous challenge. 19 Pd is regarded as a credible catalytic component for the DSHP owing to its superior hydrogen activation ability, especially at low operating temperatures. However, pure Pd is not only active in the synthesis of H 2 O 2 but also in the aforementioned side reactions.…”