Synthesis of nanoscale titanium silicalite molecular sieve and its catalytic performance for ethylene to ethylene glycol
A series of titanium silicalite molecular sieves(TS-1)were prepared by hydrothermal crys-tallization method by using tetrapropylammonium hydroxide as template,tetrabutyl titanate as Ti source,tetraethyl orthosilicate(TEOS),sodium sil-ica sol or ammonium silica sol as the Si sources,re-spectively.The synthesized samples were character-ized by X-ray diffractometer,automatic physical adsorption instrument,fluorescence spectrometer,Fourier transform infrared spectrometer,scanning electron microscope and ultraviolet-visible spec-trophotometer.The effects of Ti source introduction temperature,Si source type,crystallization time and Si/Ti ratio[n(Si)/n(Ti),the same below]on the syn-thesis of TS-1 were investigated,and the catalytic performance of a series of TS-1 for ethylene to ethy-lene glycol(EG)was compared and evaluated.The results showed that the TE-50 N-1 sample synthe-sized under the conditions of introducing Ti source at room temperature,selecting TEOS as Si source,crystallization time of 1 d,and Si/Ti ratio of 50 had the best catalytic performance,with H2O2 conversion rate of 80.04％and EG selectivity of 97.19％.
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