汽油活性炭基脱硫吸附剂的制备与评价

以250℃温度下浓硫酸改性后的活性炭为载体，采用浸渍法制备了以MnO₂为活性组分的活性炭基的汽油脱硫吸附剂MnO₂/AC，考察了吸附剂的制备条件及脱硫条件对脱硫效果的影响。研究结果表明，适宜的吸附剂制备条件为,以Mn(NO₃)₂为活性组分前驱物，Mn(NO)₂浸渍液浓度0.15mol/L、常温下浸渍24h、焙烧温度350℃、焙烧时间2h。该吸附剂在静态吸附温度120℃、吸附时间2h、剂油质量比0.10的条件下可使原料油硫的质量分数从628.6×10^-6降至221.5×10^-6，脱硫率达到64.8%；在动态吸附温度60℃、空速1.76h^-1的条件下，初始流出汽油硫的质量分数降至21.8×10^-6，初始脱硫率达到96.5%。

Preparation and evaluation of gasoline activated carbon-based desulfurization adsorbent

Taking the activated carbon that was modified under 250℃ by concentrated sulfuric acid as support, a gasoline activated carbon based desulfurization adsorbent MnO₂/AC with MnO₂ as active component was firstly prepared by impregnation. The effect of preparation and desulfurization condition on the desulfurization efficiency was investigated. The research results show that Mn(NO₃)₂ as the precursor, Mn(NO₃)₂ impregnation concentration of 0.15mol/L, the impregnation time of 24h under room temperature, the roasting temperature of 350℃ and the roasting time of 2h are the suitable adsorbent preparation conditions . The sulfur content of material gasoline can be reduced from 628.6×10^-6 to 221.5×10^-6 , which has the desulfurization efficiency up to 64.8% at the static adsorption temperature of 120℃, the adsorption time of 2h and the mass ratio of adsorbent to gasoline of 0.10; while the sulfur content in initial gasoline effluent after adsorption can be decreased from 628.6×10^-6 to 21.8×10^-6 and the initial desulfurization efficiency is 96.5% at the dynamic adsorption temperature of 60℃ and the LHSV of material gasoline of 1.76h^-1.