Insights into the intracrystalline diffusion limitations of TS-1 in catalytic cyclohexanone ammoximation: effects of the Si–OH groups inside the zeotype micropores†

Abstract

The catalytic activity of titanium silicalite-1 (TS-1) in cyclohexanone ammoximation is controlled by the intracrystalline diffusion limitations due to the hydrogen-bonding interactions between the internal Si–OH groups in TS-1 and H₂O₂, NH₃, and NH₂OH, while these Si–OH groups can be effectively annealed by an ultraviolet-assisted heat post-treatment, resulting in enhanced activity.