Ammoximation of Cyclohexanone over Shaped TS-1 Zeolite Catalysts

In this paper, shaped titanium silicalite-1 (TS-1) zeolite catalysts from spray drying and extrusion were prepared and characterized by X-ray diffraction (XRD), infrared spectroscopy (FT-IR), nitrogen physisorption and laser diffraction techniques. The typical TS-1 MFI framework structures were both well retained during the shaping process. However, the extrudates gave dramatically decreased specific surface area, total pore volume and relatively poor catalytic performance in cyclohexanone ammoximation compared to spray samples and powdered TS-1, indicating that the spray method may be better choice for the reaction. Moreover, the stability and reusability of the spray shaped catalyst was evaluated by performing consecutives batch ammoximation runs with the same catalyst sample. After the fifth batch, it observed well stability of catalytic activity and particle size distribution.