Cu-ZSM-5 molecular sieves were prepared by the ion-exchange of NH4-ZSM-5 with Cu^2＋ ions in Cu（NO3）2 solution, and was characterized by diffuse reflectance ultraviolet-visible spectroscopy （DRS-UV-vis）, fourier t...Cu-ZSM-5 molecular sieves were prepared by the ion-exchange of NH4-ZSM-5 with Cu^2＋ ions in Cu（NO3）2 solution, and was characterized by diffuse reflectance ultraviolet-visible spectroscopy （DRS-UV-vis）, fourier transform infrared spectroscopy （FT-IR） and X-ray powder diffraction （XRD） techniques. And at same time, the catalytic activity of the obtained Cu-ZSM-5 in the trichloroethylene （TCE） combustion with air in the fixed-bed system was also investigated in the present work. The results indicated that the copper content in Cu-ZSM-5 was increased with the increasing Cu2＋ concentration in ion-exchange solution, and however the catalytic activity was not always increased with the copper content in Cu-ZSM-5. It was found that Cu-ZSM-5, prepared with 0.091mol/L of Cu^2＋ solution, exhibited the best catalytic activity in TCE combustion. In combination with the characterization results by DRS-UV-vis and FT-IR techniques, it was deduced that the catalytic active species of Cu-ZSM-5 in TCE combustion with air was the skeletal copper of molecular sieves.展开更多
文摘Cu-ZSM-5 molecular sieves were prepared by the ion-exchange of NH4-ZSM-5 with Cu^2＋ ions in Cu（NO3）2 solution, and was characterized by diffuse reflectance ultraviolet-visible spectroscopy （DRS-UV-vis）, fourier transform infrared spectroscopy （FT-IR） and X-ray powder diffraction （XRD） techniques. And at same time, the catalytic activity of the obtained Cu-ZSM-5 in the trichloroethylene （TCE） combustion with air in the fixed-bed system was also investigated in the present work. The results indicated that the copper content in Cu-ZSM-5 was increased with the increasing Cu2＋ concentration in ion-exchange solution, and however the catalytic activity was not always increased with the copper content in Cu-ZSM-5. It was found that Cu-ZSM-5, prepared with 0.091mol/L of Cu^2＋ solution, exhibited the best catalytic activity in TCE combustion. In combination with the characterization results by DRS-UV-vis and FT-IR techniques, it was deduced that the catalytic active species of Cu-ZSM-5 in TCE combustion with air was the skeletal copper of molecular sieves.
