l-Arginine-Functionalized Pd-Ni Catalyst Enhances Direct H₂O₂ Synthesis in Microreactors.

Area of Science:

• Catalysis
• Materials Science
• Chemical Engineering

Background:

• Direct synthesis of hydrogen peroxide (H2O2) is crucial for various industrial applications.
• Developing stable and highly active catalysts for H2O2 production remains a significant challenge.
• Palladium-based catalysts are known for their activity but often require specific conditions or modifications.

Purpose of the Study:

• To develop a novel l-arginine (LA)-functionalized Pd-Ni catalyst for direct H2O2 synthesis.
• To investigate the catalytic activity, stability, and underlying mechanism of the functionalized catalyst.
• To propose a systematic strategy for designing efficient Pd-based catalysts for H2O2 production.

Main Methods:

• Synthesis of an l-arginine (LA)-functionalized Pd-Ni catalyst.
• Direct synthesis of H2O2 using a self-designed microreactor at ambient conditions.
• Catalytic activity evaluation, characterization (e.g., electronic structure), and simulation studies.

Main Results:

• Achieved a high H2O2 yield of 574.31 g kg_cat⁻¹ h⁻¹ with a concentration of 4.05 wt % per hour.
• The LA-functionalized Pd-Ni catalyst demonstrated high stability over five cycles with online activation.
• Ni doping and LA-functionalization were shown to synergistically modulate the electronic structure of Pd, enhancing catalytic performance.

Conclusions:

• The LA-functionalized Pd-Ni catalyst offers an efficient and stable pathway for direct H2O2 synthesis.
• Modulation of the electronic structure of Pd by Ni doping and LA-functionalization is key to improved performance.
• This study presents a viable strategy for designing advanced Pd-based catalysts for direct H2O2 production.