Phase-interface-anchored cadmium single-atom catalysts for efficient methanol steam reforming

Area of Science:

• Materials Science
• Catalysis
• Chemical Engineering

Background:

• Designing efficient single-atom catalysts (SACs) for methanol steam reforming (MSR) is crucial for hydrogen production.
• Interface engineering offers a promising strategy to enhance catalyst performance.

Purpose of the Study:

• To develop novel phase-interface confined SACs for improved MSR.
• To investigate the catalytic activity and stability of these engineered catalysts.

Main Methods:

• Synthesis of Cd/P25 SACs with Cd atoms anchored at anatase (101) and rutile (110) phase interfaces.
• Characterization of the unique geometric and electronic properties of the Cd-O-Ti interface sites.
• Evaluation of catalytic performance in MSR, including conversion, selectivity, and stability.

Main Results:

• Achieved 100% methanol conversion with low CO concentration (~0.1 mol%) and sustained stability (>150 h).
• Interface sites exhibited significantly higher H2 production rates (15-fold and 8-fold) compared to anatase and rutile surfaces.
• Atmosphere pretreatment enhanced phase interface density, increasing H2 production by an additional 11%.

Conclusions:

• Phase-interface confined SACs demonstrate superior performance for MSR.
• The engineered interface sites are key to enhanced catalytic activity and stability.
• 3D printing capability advances the practical application of these SACs for in-situ hydrogen generation.