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.