Gold catalysts containing interstitial carbon atoms boost hydrogenation activity

Area of Science:

• Heterogeneous catalysis
• Nanoparticle catalysis
• Materials science

Background:

• Supported gold nanoparticles are promising catalysts for selective hydrogenation.
• Traditional supports like silica limit gold's catalytic activity due to poor hydrogen dissociation.
• Optimizing support materials is crucial for enhancing gold nanoparticle performance.

Purpose of the Study:

• To develop a novel supported gold catalyst with improved hydrogenation activity.
• To investigate the effect of a unique carbon support structure on gold's electronic properties and catalytic performance.
• To demonstrate enhanced chemoselective hydrogenation using the new catalyst system.

Main Methods:

• Synthesizing gold nanoparticles partially embedded in mesoporous carbon supports.
• Characterizing the catalyst for improved electron transfer from carbon to gold.
• Evaluating the catalyst's performance in the chemoselective hydrogenation of 3-nitrostyrene.
• Assessing catalyst stability and recyclability.

Main Results:

• The gold/mesoporous carbon catalyst exhibited three times higher turn-over frequency (TOF) compared to the established Au/TiO2 system.
• Improved electron transfer from the carbon support to gold was observed.
• The catalyst demonstrated excellent stability, with negligible loss of activity after ten recycling cycles.
• A linear relationship was found between gold's d electron gain, activation entropy, and TOF.

Conclusions:

• Partially embedding gold nanoparticles in mesoporous carbon enhances hydrogenation catalysis.
• The improved electronic interaction between gold and the carbon support is key to higher catalytic activity.
• This strategy offers a viable route for designing advanced noble metal catalysts for efficient hydrogenation.
• The developed catalyst is stable and recyclable, showing significant potential for industrial applications.