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Effect of triethylamine treatment of titanium silicalite-1 on propylene epoxidation |
Juan XU,Yaquan WANG( ),Wenping FENG,Yi LIN,Shuhai WANG |
| Key Laboratory for Green Chemical Technology of the Ministry of Education, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China |
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Abstract Titanium silicalite-1(TS-1) treated with triethylamine (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 concentration, 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.
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| Keywords
titanium silicalite-1
triethylamine
hollow cavity
epoxidation of propylene
catalyst life
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Corresponding Author(s):
Yaquan WANG
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Online First Date: 11 December 2014
Issue Date: 14 January 2015
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