Catalytically Active Pd-Ag Alloy Nanoparticles Synthesized in Microemulsion Template

Area of Science:

• Nanotechnology
• Catalysis
• Materials Science

Background:

• Bimetallic nanoparticles offer tunable catalytic properties.
• Traditional synthesis methods often employ hazardous reducing agents.
• Developing greener synthesis routes is crucial for sustainable chemistry.

Purpose of the Study:

• To synthesize catalytically active bimetallic palladium-silver (Pd-Ag) nanoparticles.
• To utilize methanol as an environmentally friendly reducing agent.
• To characterize the structure, composition, and catalytic activity of the synthesized nanoparticles.

Main Methods:

• Reversed microemulsion technique for nanoparticle synthesis.
• X-ray diffraction (XRD) and transmission electron microscopy (TEM) for structural characterization.
• CO chemisorption, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and scanning transmission electron microscopy with energy-dispersive X-ray spectroscopy (STEM-EDX) for surface and compositional analysis.

Main Results:

• Crystalline Pd-Ag nanoalloys with sizes ranging from 5-12 nm were successfully synthesized.
• Characterization confirmed uniform Pd-Ag ratios on the nanoparticle surfaces, consistent with bulk composition.
• No core-shell structures were detected, as supported by numerical simulations.
• The synthesized nanoparticles demonstrated catalytic activity in CO oxidation.

Conclusions:

• Methanol is an effective and sustainable reductant for synthesizing catalytically active Pd-Ag nanoalloys.
• The synthesized nanoparticles possess a homogeneous elemental distribution, crucial for predictable catalytic performance.
• This greener approach offers a viable alternative for producing advanced nanomaterials for catalysis.