活性炭吸附脱硫机理的硬软酸碱理论研究

以噻吩为吸附脱除对象,分别以环己烷、正庚烷或正癸烷为烷烃的模型化合物,环己烯和甲苯为烯烃和芳烃的模型化合物,模拟流化催化裂化汽油的组分,配制模型汽油。考察了活性炭在过硫酸铵氧化处理前后,对含不同竞争吸附质的模型汽油中噻吩的吸附脱除性能,并采用量子化学方法计算得到噻吩和竞争吸附质的化学硬度,根据硬软酸碱理论分析了不同吸附质与噻吩竞争吸附作用的强弱。结果表明,化学硬度与噻吩差别较大的烷烃(环己烷、正庚烷和正癸烷)与噻吩的竞争吸附作用/不明显,而化学硬度与噻吩较接近的环己烯和甲苯则与噻吩的竞争吸附作用较强,特别是甲苯。氧化处理后的活性炭由于表面含氧基团的增加导致表面局部化学硬度改变,也是它对噻吩的吸附作用增强的原因之一。

Hard-Soft Acid-Base Investigation of Adsorptive Desulfurization by Activated Carbon

Adsorptive desulfurization performance of activated carbon,both before and after oxidation treatment with ammonium persulfate,for simulated fluid catalytic cracking (FCC) gasoline was investigated.The cyclohexane,n-heptane and n-decane in simulated FCC gasoline were presented as model alkanes;cyclohexene and toluene were presented as model olefin and aromatics respectively. Thiophene was the object of adsorptive desulfurization.Chemical hardness of both thiophene and competitive compounds were calculated by...