活性炭负载铜吸附剂的制备与脱除噻吩的研究

Preparation of Activated Carbon Loaded Copper Adsorbent for Removal of Thiophene

采用等体积浸渍法制备了以活性炭为载体的Cu/AC吸附剂,并进行了模型柴油中噻吩的吸附脱除性能研究。采用N2吸附、SEM、TEM及XRD技术对吸附剂进行了表征。考察了浸渍时间、负载量、焙烧时间、焙烧温度对吸附脱硫效果的影响,得出吸附剂的最佳制备条件:浸渍时间为12 h,Cu负载量为5%(wt),焙烧温度为400 oC,焙烧时间为2 h。在此条件下制备的吸附剂对模型油中噻吩的脱除率达95.7%。最后对吸附机理进行了初步探讨,一价铜对噻吩的吸附作用较强,可能是通过π键配位作用对噻吩进行脱除的,具体的吸附机理仍待于进一步研究。

The adsorbent of activated carbon （AC） loaded copper was prepared by using equal volume impregnation method, and its desulfurization performance of adsorbing thiophene in model diesel fuel was investigated. N2 adsorption, Scanning Electron Microscope （SEM）, Transmission Electron Microscope （TEM） and X-ray Diffraction （XRD） were adopted to characterize the prepared adsorbents. The effects of the immersion time, loading amounts of copper species, calcination temperature and calcination time of adsorbents on desulfurization performance were studied. The optimum preparation conditions were obtained as follows：immersion time 12 h, Cu loading amounts 5%（wt）, calcination temperature 400℃ and calcination time 2 h. Sulfur removal ratio reaches up to 95.7% by using the prepared adsorbents under the optimal experimental conditions. Possible adsorptive mechanism, that through π complexion the Cu（I） has a stronger adsorption removal ability for thiophene, was also studied at last, and further study in future is still necessary to investigate the specific adsorption mechanism.