Isolated Nano-Island Catalysts Enable Efficient Double-Bond Migration over Pd Nanoparticles

Area of Science:

• Heterogeneous catalysis
• Nanomaterials science
• Surface chemistry

Background:

• Nanoparticles (NPs) are crucial in heterogeneous catalysis, but their instability poses challenges for stabilizing small metal species.
• Controlling NP size and electronic properties is key to optimizing catalytic activity.

Purpose of the Study:

• To develop a nanoisland catalyst architecture for precise control over palladium (Pd) particle size and electronic properties.
• To enhance catalytic performance through synergistic interactions between Pd and ceria (CeO2).

Main Methods:

• Synthesized Pd/xCeO2/SiO2 catalysts using a nanoisland architecture.
• Dispersed CeO2 nanoparticles on a SiO2 support.
• Achieved selective Pd deposition on CeO2 via strong metal-support interactions and electron transfer.

Main Results:

• The nanoisland structure provided precise control over Pd particle size and electronic properties.
• Optimized Pd-CeO2 synergy in the nanoisland structure enhanced catalytic performance.
• Pd/7%CeO2/SiO2 achieved 90% isomerization selectivity and a TOF of 26,000 h-1 in double-bond migration.
• Catalyst performance was 3-8 times higher than single-support catalysts.

Conclusions:

• The developed nanoisland catalyst strategy offers precise control over catalytic properties.
• This approach significantly enhances catalytic efficiency for key reactions like double-bond migration.
• The successful scale-up for industrial production demonstrates the practical viability of this nanostructuring strategy.