A magnetically recyclable TS-1 for ammoximation of cyclohexanone

In this paper, Fe₃O₄ nanoparticles coated with titanium silicalite-1 (designated Fe₃O₄@TS-1) were successfully prepared and used as catalysts for ammoximation of cyclohexanone. Characterizations demonstrated that the magnetic catalyst was coated with a thin TS-1 layer of ~ 30 nm in thickness. The catalyst still displayed excellent catalytic activity after introducing Fe₃O₄ core. Recovery experiments revealed that Fe₃O₄@TS-1 catalyst could be easily recovered by adding an external magnetic field. Moreover, no appreciable catalytic deactivation was observed after four times of recycling. This work provided a promising way to overcome the recycle problem during the application of TS-1.