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采用浸渍法制备Cu-β/SBA-15复合分子筛,通过XRD、N2吸附-脱附、NH3-TPD、Py-FTIR等对其进行结构表征,结果表明:Cu-β/SBA-15具有微-介孔复合结构和表面弱酸性。以Cu-β/SBA-15为吸附剂,在间歇式微型反应釜中,进行静态吸附脱除二苯并噻吩(DBT)实验,考察了反应温度、反应时间和剂油质量比(“剂”指吸附剂Cu-β/SBA-15,“油”指模拟柴油)对吸附量的影响,并对其吸附动力学进行了考察。结果表明,在反应温度120℃,反应时间120 min,m(剂)∶m(油)=1∶30的条件下,模拟柴油的脱硫率可达54.62%、吸附剂吸附硫容量为2.27 mg/g;在Cu-β/SBA-15对DBT吸附的初始阶段,准二级动力学方程和Elovich方程均能很好地反映吸附模式,而整个吸附过程中,准二级动力学相关系数R2>0.99,拟合计算出的平衡吸附硫容量qe=2.54 mg/g,与实际所测值相差很少,说明准二级动力学吸附模型能更全面的描述Cu-β/SBA-15对DBT的吸附过程,其吸附过程是液膜扩散和内扩散共同作用的结果。
The Cu-β / SBA-15 composite molecular sieves were prepared by impregnation method and characterized by XRD, N2 adsorption-desorption, NH3-TPD and Py-FTIR.The results showed that Cu- Mesoporous composite structure and surface weak acidity. The DBT experiment was carried out by static adsorption in a batch-type mini-reactor using Cu-β / SBA-15 as adsorbent. The reaction temperature, reaction time and the mass ratio of solvent to oil “Refers to the adsorbent Cu-β / SBA-15,” oil "refers to the simulated diesel) on the adsorption capacity, and its adsorption kinetics were investigated. The results showed that the desulfurization rate of simulated diesel reached 54.62% under the conditions of reaction temperature of 120 ℃, reaction time of 120 min, m (oil) = 1:30, adsorption capacity of adsorbent for sulfur was 2.27 mg / g. In the initial stage of DBT adsorption of Cu-β / SBA-15, the quasi-second order kinetic equation and the Elovich equation can all well reflect the adsorption mode. In the whole adsorption process, the quasi-second order kinetic correlation coefficient R2> 0.99. The calculated equilibrium adsorption capacity qe = 2.54 mg / g, which is slightly different from the measured value. It shows that quasi-second-order kinetic adsorption model can describe the effect of Cu-β / SBA-15 on DBT Adsorption process, the adsorption process is the result of liquid film diffusion and internal diffusion together.