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采用钛酸丁酯/无水乙醇溶液与USY沸石浸渍及采用氟钛酸铰溶液与USY沸石二次合成等方法,制备了一系列含钛USY沸石.通过XRD,FT-Raman光谱,正庚烷吸附等温线,UV-DRS及FT-IR光谱等手段的表征,表明在所制备的含钛USY沸石样品中,当Ti含量较小(≤4.8%TiO_2)时,Ti是以高分散状态分布在沸石表面.不同制备方法所得含钛USY沸石样品中用的状态是各不相同的.UV-DRS和FT-IR证实,以二次合成法制备的含钛USY沸石样品中,Ti主要处于沸石骨架位;而以钛酸丁酯/无水乙醇溶液浸渍法制备的样品,Ti是以单齿(monofunctional)和双齿(bifunctional)形式与沸石的表面羟基相结合.
A series of titanium-containing USY zeolites were prepared by impregnation with butyl titanate / ethanol solution and USY zeolite and secondary synthesis with fluotitanic acid hindered solution and USY zeolite. The effects of XRD, FT-Raman spectra, The results of adsorption isotherm, UV-DRS and FT-IR spectra indicate that Ti is dispersed in a highly dispersed state with a small content of Ti (≤4.8% TiO_2) Zeolite surfaces. The states used in the different samples of the USY-containing zeolite prepared by the different methods were different, and UV-DRS and FT-IR confirmed that the Ti-based USY zeolite prepared by the secondary synthesis was mainly in the zeolite framework While in the sample prepared by impregnation with butyl titanate / ethanol solution, Ti was combined with the surface hydroxyl of zeolite in monofunctional and bifunctional forms.