CuNaY分子筛上汽油馏分中含硫组分的选择吸附及其红外光谱研究

本文从基础研究的角度出发,以红外光谱技术为主要研究手段,以噻吩为汽油馏分中含硫有机分子的模型化合物,首次给出了噻吩分子在吸附剂表面的吸附方式和吸附位,以及芳烃对噻吩吸附的影响等红外光谱信息.为避免吸附剂的强酸性可能引起的干扰,采用NaY分子筛为原料进行液相离子交换制备吸附剂.

IR Spectroscopic Study on Selective Adsorption of Sulfur-containing Compounds from Gasoline Distillation on Copper-exchanged Y Zeolite

Desulfurization of gasoline distillation with adsorption was studied at ambient temperature and pressure by using CuNaY(NaY exchanged with copper nitrate aqueous solution) as the adsorbents.The gasoline distillation was composed of thiophene-cyclohexane solution(115.0 μg/mL) with or without toluene.For the solution without toluene,no detectable sulfur was found in the effluent when the effluent volume was less than 40 mL,while the addition of toluene resulted in an evident drop of the adsorption performance for(CuNaY.) FTIR spectra indicate that the conversion of Cu(2+) to Cu+ took place during the pretreatment of(CuNaY) adsorbent,and the interaction mode between the adsorbed thiophene molecules and Cu+ is π complexation.This adsorption mode is easily affected by aromatic compounds,resulting in the significant decrease of adsorption capacity in model gasoline containing toluene on CuNaY.