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Modification of acid-functionalized multi-walled carbon nanotubes (MWCNTs)-COOH with Eu 2 O 3  nanoparticles using Eu(NO 3 ) 3 .6H 2 O, produced an efficient catalyst for the synthesis of some nitrogen-containing heterocycles such as quinoxalines. The products were identified by CHN analysis, NMR, and FT-IR spectra. On the other hand, synthesis of Eu 2 O 3  nanoparticles and their conjugation on the surface of (MWCNTs)-COOH have been confirmed by FT-IR, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Energy-dispersive X-ray spectroscopy (EDX).

Preparation, Characterization, and Application of (MWCNTs)-COOH/Eu 2 O 3 as an Efficient Reusable Catalyst