CuCl负载型吸附剂的深度脱硫性能研究

Deep Desulfurization Performance of CuCl Supported Adsorbents

采用浸渍法制备了活性氧化铝(γ-Al2O3)、硅胶(SiO2)和改性活性炭(记为AC-H2O2)负载CuCl的脱硫吸附剂,通过常温常压下吸附剂在噻吩溶液中的静态吸附实验评价其深度脱硫性能。结果表明:极性或酸性的吸附剂表面有利于吸附噻吩;CuCl在γ-Al2O3、AC-H2O2和SiO2上的最优负载量分别为0.4mg?m?2、0.5mg?m?2和0.21mg?m?2,对应吸附剂的硫吸附量分别为9.7×10?4mg?m?2、6.2×10?4mg?m?2和2.9×10?4mg?m?2;吸附剂制备过程中添加少量稀土化合物CeO2可以使CuCl/γ-Al2O3的脱硫率提高17.5%。

Selective adsorbents for deep desulfurization of fuel oil were prepared by supporting CuCl on alumina （y-Al2O3）, silica gel （SiO2） and modified activated carbon （AC-H2O2）, respectively. The adsorption of sulfur compound, thiophene, in an organic model solution for gasoline （isooctane with 0.5 mmol·L^-1 thiophene） was studied by a batch method under ambient conditions. The results of sulfur adsorption on porous materials, such as 7-Al2O3. SiO2 and AC-H2O2, show that the adsorbents with polar and acid surfaces are preferable for sulfur adsorption. Through comparing the amounts of sulfur adsorbed by the adsorbents with various CuCl-loading amounts, the suitable CuCl-loading amounts for different supports were obtained. As sulfur adsorbent, the optimal CuCl-loading amounts found for different supports, such as the γ-Al2O3, SiO2 and AC-H2O2 are 0.4 mg·m^-2, 0.21 mg·m^-2 and 0.5 mg·m^-2, respectively, and their corresponding sulfur adsorptive capacities are 9.7×10^-4 mg·m^-2, 2.9×10^-4 mg·m^-2 and 6.2×10^-4 mg·m^-2. The experiments also show that adding a little amount of rare earth compound CeO2 onto the CuCl/γ-Al2O3 during the preparation of the adsorbent, the desulfurization ability of the adsorbent prepared can be increased about 17.5%.