Titanium silicalite- 1 （TS- 1） treated with triethy- lamine （TEA） solution under different conditions was characterized by X-ray powder diffraction （XRD）, Fourier- transform infrared spectrum （FTIR）, ultraviol...Titanium silicalite- 1 （TS- 1） treated with triethy- lamine （TEA） solution under different conditions was characterized by X-ray powder diffraction （XRD）, Fourier- transform infrared spectrum （FTIR）, ultraviolet-visible diffuse reflectance spectrum （UV-Vis）, nitrogen physical adsorption and desorption, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The characterization results show that many irregular hollows are generated in the TS-1 crystals due to the random dissolution of framework silicon and the volume of the hollow cavities increase with increasing the TEA con- centration, and the treatment temperature and time. The modified TS-1 samples improved in varying degrees the catalyst life for the epoxidation of propylene in a fixed-bed reactor probably due to the generation of the hollows to make it easy for the reactants and products to diffuse out of the channels.展开更多
文摘Titanium silicalite- 1 （TS- 1） treated with triethy- lamine （TEA） solution under different conditions was characterized by X-ray powder diffraction （XRD）, Fourier- transform infrared spectrum （FTIR）, ultraviolet-visible diffuse reflectance spectrum （UV-Vis）, nitrogen physical adsorption and desorption, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The characterization results show that many irregular hollows are generated in the TS-1 crystals due to the random dissolution of framework silicon and the volume of the hollow cavities increase with increasing the TEA con- centration, and the treatment temperature and time. The modified TS-1 samples improved in varying degrees the catalyst life for the epoxidation of propylene in a fixed-bed reactor probably due to the generation of the hollows to make it easy for the reactants and products to diffuse out of the channels.
