Study on High Activity and Outstanding Stability of Hollow-NiPt@SiO₂ Core-Shell Structure Catalyst for DRM Reaction

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Dry reforming of methane (DRM) is crucial for converting greenhouse gases into synthesis gas.
• Developing stable and active catalysts for DRM at high temperatures remains a significant challenge.
• Existing supported catalysts often suffer from deactivation due to sintering and carbon deposition.

Purpose of the Study:

• To synthesize and characterize a novel hollow-NiPt@SiO2 core-shell catalyst.
• To evaluate the catalytic activity and stability of the core-shell catalyst in the DRM reaction.
• To compare the performance of the core-shell catalyst with traditional supported catalysts and catalysts with different nuclei.

Main Methods:

• Preparation of hollow-NiPt@SiO2 core-shell nanoparticles using the Stober method.
• Characterization of the catalyst structure and composition using various analytical techniques.
• Testing the catalytic performance in the dry reforming of methane (CH4) with CO2 at 800°C.

Main Results:

• The hollow-NiPt@SiO2 core-shell catalyst achieved 97% CH4/CO2 conversion and maintained stability for 200 hours at 800°C.
• Core-shell catalysts exhibited significantly better stability compared to hollow-NiPt/SiO2 supported catalysts.
• The activity order was determined as Hollow-NiPt > NiPt NPs > Pt NPs > Ni NPs, attributed to the hollow structure and NiPt alloy formation.

Conclusions:

• The hollow-NiPt@SiO2 core-shell structure offers a larger active specific surface area and improved thermal stability.
• The synergistic effect of NiPt alloy formation enhances catalytic activity.
• This catalyst presents a promising and efficient solution for sustainable DRM applications.