▎ 摘　　要

NOVELTY - Magnetically separable iron nanoparticles supported on nitrogen doped graphene catalyst, is claimed. The iron nanoparticles has diameter of 10-50 nm and iron is present as iron(III) oxide, iron(II,III) oxide, iron nitride or iron carbide (Fe3C, Fe7C3). USE - The nanoparticles are useful for: oxidant-free catalytic dehydrogenation of alcohols to value added product i.e. carbonyl with hydrogen as the only by product; and oxidant-free catalytic dehydrogenation of amines to corresponding N-heterocylic compounds with hydrogen as the only by product. ADVANTAGE - The nanoparticles: are inexpensive and environment friendly; can be prepared by simple process; and utilizes catalyst which is capable for easy separation and recycling. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing iron nanoparticles supported on nitrogen doped graphene catalyst, comprising (a) sonicating the mixture of iron(III) acetyl acetone and 1-10-phenanthroline in a ratio of 1-3 in solvent for 1-2 hours to obtain a solution, (b) sonicating exfoliated graphene oxide in solvent for 1-2 hours to obtain a solution, (c) mixing the solutions as obtained in step (a) and (b) and further sonicating the mixture for 1-2 hours to obtain a mixture, and (d) refluxing the reaction mixture as obtained in step (c) at 80-90 degrees C for 3-5 hours followed by calcination to obtain iron nanoparticles supported on nitrogen doped graphene catalyst.