Highly basic CaO nanoparticles in mesoporous carbon materials and their excellent catalytic activity

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Development of efficient heterogeneous catalysts is crucial for sustainable chemical synthesis.
• Mesoporous carbon materials offer high surface area and tunable pore structures for catalyst immobilization.
• Calcium oxide (CaO) nanoparticles exhibit strong basicity, making them suitable for base-catalyzed reactions.

Purpose of the Study:

• To synthesize and characterize highly basic CaO nanoparticles immobilized on mesoporous carbon materials (CaO-CMK-3).
• To investigate the effect of CaO loading and carbon support pore diameter on material properties and basicity.
• To evaluate the catalytic performance of CaO-CMK-3 in the transesterification of ethylacetoacetate.

Main Methods:

• Wet-impregnation method for synthesizing CaO-CMK-3.
• Extensive characterization using XRD, nitrogen adsorption, HRSEM-EDX, HRTEM, and CO2-TPD.
• Evaluation of catalytic activity in base-catalyzed transesterification reactions.

Main Results:

• Successfully prepared CaO-CMK-3 materials with well-dispersed CaO nanoparticles, ordered nanopores, high surface area, and significant basicity.
• Basicity of CaO-CMK-3 can be controlled by adjusting CaO loading and pore diameter.
• The 30% CaO-CMK3-150 catalyst demonstrated high activity and conversion in a short reaction time for transesterification, with activity order: octanol > butanol > cyclohexanol > benzyl alcohol > furfuryl alcohol.

Conclusions:

• CaO-CMK-3 materials are effective heterogeneous catalysts for transesterification.
• Catalyst performance is strongly influenced by CaO loading and the pore diameter of the mesoporous carbon support.
• Optimized CaO-CMK-3 catalysts offer a promising route for efficient base-catalyzed organic transformations.