Embedded-Type Cu Nanoparticle with Largely Enhanced Catalytic Activity and Stability Toward Methanol Steam Reforming

Area of Science:

• Materials Science
• Catalysis
• Renewable Energy

Background:

• Low-temperature methanol steam reforming (MSR) is crucial for hydrogen production but faces challenges.
• Developing efficient and stable catalysts is essential for advancing new energy technologies.

Purpose of the Study:

• To develop a highly active and stable Cu/Zn(Ga)Ox catalyst for low-temperature MSR.
• To elucidate the catalytic mechanism and structure-activity relationship of the novel catalyst.

Main Methods:

• Interface reconstruction strategy for catalyst preparation.
• Methanol steam reforming reaction testing at 225 °C.
• Kinetic isotope analysis, in situ spectroscopy, and theoretical calculations.

Main Results:

• The Cu/Zn(Ga)Ox catalyst achieved 99.3% methanol conversion and a H2 production rate of 124.6 μmol gcat-1 s-1.
• Demonstrated ultra-high catalytic stability over a 400-hour continuous test.
• Identified the formaldehyde oxidation pathway and the crucial role of the Cu+-Ov interface.

Conclusions:

• The mortise-and-tenon structure and Cu+-Ov interface are key to the catalyst's high performance.
• The catalyst significantly lowers the energy barrier for C-H bond cleavage and H2O dissociation.
• This work offers a promising pathway for efficient hydrogen production via MSR.