Spherified Pd_0.33Ni_0.67/BCNT Catalyst for Nitrobenzene Hydrogenation

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Development of efficient and recoverable catalysts is crucial for sustainable chemical synthesis.
• Carbon nanotube-based materials offer unique properties for catalytic applications.
• Palladium nanoparticles are effective hydrogenation catalysts.

Purpose of the Study:

• To synthesize and characterize a separable bamboo-like carbon nanotube-based catalyst.
• To evaluate the catalyst's performance in nitrobenzene hydrogenation using various solvents.
• To assess the catalyst's reusability and palladium leaching.

Main Methods:

• Spherification method using sodium alginate and nickel to create catalyst support.
• Carbonization of the spheres followed by palladium nanoparticle decoration.
• Nitrobenzene hydrogenation experiments in methanol, ethanol, isopropanol, tetrahydrofuran, and acetonitrile.
• Analysis of aniline yield, catalyst stability, and palladium leaching.

Main Results:

• The catalyst exhibited high efficiency in nitrobenzene hydrogenation, achieving ~100% aniline yield in ethanol.
• Polar solvents significantly enhanced aniline yield compared to apolar solvents.
• The catalyst maintained its structural integrity over multiple uses with minimal palladium loss (5.48 rel.%).
• The catalyst was easily separated and retrieved after the reaction.

Conclusions:

• The developed bamboo-like carbon nanotube catalyst is highly effective and selective for nitrobenzene hydrogenation.
• Solvent choice plays a critical role in optimizing catalytic performance.
• The catalyst demonstrates excellent reusability and stability, making it a promising candidate for industrial applications.