摘要
Montmorillonite supported titanium （Ti-MMT） or antimony catalyst （Sb-MMT） has been a hot area of research on preparing polyethylene terephthalate/montmorillonite （PET/MMT） nanocomposites by in situ polymerization. So removal of Ti or Sb from Ti-MMT or Sb-MMT is not expected during in situ polymerization. Studies on immobilization of Ti or Sb on Ti-MMT or Sb-MMT are seldom reported. In this work, a series of montmorillonite supported catalysts of titanium （Ti-MMT） or antimony （Sb-MMT） and cointercalated montmorillonite of titanium and antimony （Ti/Sb-MMT） were prepared by （1） the reaction of sodium bentonite suspension with intercalating solution containing titanium tetrachloride and/or antimony chloride, and （2） drying or calcinating the products at different temperature （100, 150, 240, 350 and 450 ℃）. The physicochemical properties of these MMT supported catalysts were studied by X-ray diffraction （XRD）, fourier transform infrared spectroscopy （FT-IR）, inductively coupled plasma optical emission spectrometer （ICPOES）, N2 adsorption/desorption isotherms, UV-visible diffuse reflectance spectroscopy（UV-vis） and transmission electron microscopy （TEM）. The immobile character of Ti or Sb on MMT supported catalysts was evaluated by a two-step method in deionized water or ethylene glycol. Several results were obtained, i e, （a） during the preparation, with an increase in drying or calcinating temperature, the amount of titanium and/or antimony species remained on these MMT supported catalysts decreased, （b） the experiments about immobile character of Ti or/and Sb showed that with an increase in drying or calcinating temperature, the immobilization of Ti and/or Sb species remained on these MMT supported catalysts increased gradually, （c） Ti-MMT calcinated at 450℃ had the biggest pore volume, which means Ti-MMT had the best adsorption application prospect.
Montmorillonite supported titanium （Ti-MMT） or antimony catalyst （Sb-MMT） has been a hot area of research on preparing polyethylene terephthalate/montmorillonite （PET/MMT） nanocomposites by in situ polymerization. So removal of Ti or Sb from Ti-MMT or Sb-MMT is not expected during in situ polymerization. Studies on immobilization of Ti or Sb on Ti-MMT or Sb-MMT are seldom reported. In this work, a series of montmorillonite supported catalysts of titanium （Ti-MMT） or antimony （Sb-MMT） and cointercalated montmorillonite of titanium and antimony （Ti/Sb-MMT） were prepared by （1） the reaction of sodium bentonite suspension with intercalating solution containing titanium tetrachloride and/or antimony chloride, and （2） drying or calcinating the products at different temperature （100, 150, 240, 350 and 450 ℃）. The physicochemical properties of these MMT supported catalysts were studied by X-ray diffraction （XRD）, fourier transform infrared spectroscopy （FT-IR）, inductively coupled plasma optical emission spectrometer （ICPOES）, N2 adsorption/desorption isotherms, UV-visible diffuse reflectance spectroscopy（UV-vis） and transmission electron microscopy （TEM）. The immobile character of Ti or Sb on MMT supported catalysts was evaluated by a two-step method in deionized water or ethylene glycol. Several results were obtained, i e, （a） during the preparation, with an increase in drying or calcinating temperature, the amount of titanium and/or antimony species remained on these MMT supported catalysts decreased, （b） the experiments about immobile character of Ti or/and Sb showed that with an increase in drying or calcinating temperature, the immobilization of Ti and/or Sb species remained on these MMT supported catalysts increased gradually, （c） Ti-MMT calcinated at 450℃ had the biggest pore volume, which means Ti-MMT had the best adsorption application prospect.
