制备因素对CuCl/SiO_2吸附脱硫剂性能的影响

汽油脱硫一直是化工领域备受关注的热点,吸附脱硫是能够达到深度脱硫和能耗较少的脱硫方法,吸附剂性能决定吸附脱硫效果。以大孔二氧化硅为载体,氯化亚铜为活性组分,采用等体积浸渍-焙烧还原法制备CuCl/SiO_2吸附剂,考察焙烧温度、焙烧时间和活性组分负载量对吸附剂吸附脱硫性能的影响。结果表明,在焙烧温度400℃,焙烧时间4 h,氯化亚铜负载质量分数为9.4%的条件下,吸附剂对乙硫醇的吸附量最高达到26.76 mg·g~(-1)。吸附剂对于不同的硫化物(噻吩、苯并噻吩和二苯并噻吩)均有一定的吸附,尺寸较小的硫化物,吸附呈现尺寸越小吸附量越多的趋势,此时起主要作用的是空间位阻效应;硫化物尺寸较大时,吸附的强弱主要来自于电子密度的强弱。

Influence of preparation factors on the properties of CuCl/SiO2 adsorbents in the process of adsorption desulfurization

The desulfurization of gasoline has been the hot spot in the field of chemical engineering.Adsorption desulfurization is one of desulfurization methods,which can reach deep or ultra-deep desulfurization with low energy consumption.The property of the adsorbents plays a leading role in adsorption desulfurization.Using macropore silicon dioxide as the carrier and cuprous chloride as the active component,CuCl/SiO₂ adsorbents were prepared by impregnation-calcined reduction method.The influence of calcination temperatures,calcination time and active component loadings on the adsorption desulfurization property of CuCl/SiO₂ adsorbents was investigated.The results showed that under the condition of calcination temperature 400 ℃,calcination time 4 h and cuprous chloride loading mass fraction 9.4%,the maximum adsorption capacity of ethyl mercaptan on the adsorbent reached 26.76 mg·g^-1.Furthermore,the adsorbents could remove the sulfur-containing compounds such as thiophene,benzothiophene and dibenzothiophene.Owing to steric-hinerance effect,the smaller the size of sulfur-containing compounds was,the larger the adsorption capacity was;however,for the big size sulfur-containing compounds the adsorption capacity depended on electron density.