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采用液相离子交换法制备了NiY及NiY/Beta分子筛,利用智能重量分析仪测定了噻吩、苯在NiY、NiY/Beta分子筛上的吸附-脱附等温线,计算比较了噻吩、苯在分子筛上的扩散系数,同时使用固定床技术考查了改性后的分子筛对催化裂化汽油的吸附脱硫性能。结果表明,复合分子筛NiY/Beta仍然保持着较好的微孔结构,对噻吩的饱和吸附量大于苯的。而且噻吩在NiY/Beta分子筛上的相对扩散系数明显增大,而苯的扩散系数有所减少,这有利于噻吩在分子筛上的扩散过程,抑制了苯在分子筛上的吸附,从而提高了NiY/Beta复合分子筛对噻吩的选择性脱除能力。对于FCC汽油NiY/Beta复合分子筛也表现出更好的深度脱硫能力。
NiY and NiY / Beta zeolites were prepared by liquid-phase ion exchange method. The adsorption-desorption isotherms of thiophene and benzene on NiY and NiY / Beta zeolites were measured by an intelligent gravimetric analyzer. The diffusion coefficient of the catalytic cracking gasoline was also investigated by the fixed bed technology. The results show that the composite zeolite NiY / Beta still maintained a better microporous structure, the saturated adsorption capacity of thiophene than benzene. Moreover, the relative diffusion coefficient of thiophene on NiY / Beta zeolite increased significantly, while the diffusion coefficient of benzene decreased, which was in favor of the diffusion of thiophene on the molecular sieve and inhibited the adsorption of benzene on the molecular sieve, thus increasing the NiY / Beta composite zeolite selective removal of thiophene ability. For FCC gasoline NiY / Beta composite zeolite also showed better ability of deep desulfurization.