Cu(Ⅰ)Y分子筛吸附剂的制备及其脱硫性能

采用水热离子交换法制备了Cu(Ⅱ)Y分子筛,对Cu(Ⅱ)Y分子筛进行活化处理制得Cu(Ⅰ)Y分子筛吸附剂,在固定床中考察了吸附温度、操作压力和液态空速对Cu(Ⅰ)Y分子筛吸附剂脱硫性能的影响。实验结果表明,Cu(Ⅱ)Y分子筛适宜的离子交换条件为:Cu(NO3)2溶液浓度0.5 mol/L、固液比(离子交换过程中NaY分子筛与Cu(NO3)2溶液的质量比)0.05、交换温度135℃、交换时间12 h;在低于600℃时,活化温度越高,活化时间越长,Cu(Ⅰ)Y分子筛吸附剂的脱硫性能越好,适宜的活化条件为在N2中500℃下活化6 h;在固定床中,Cu(Ⅰ)Y分子筛吸附剂适宜的脱硫条件是常温、常压、液态空速10 h-1,在此条件下,Cu(Ⅰ)Y分子筛吸附剂对模型汽油的饱和硫容量为8.61%。

Preparation and Desulfurization Property of Cu(Ⅰ)Y Zeolite Adsorbent

Cu(Ⅱ)Y zeolite was prepared by hydrothermal ion exchange method.By activation of(Cu(Ⅱ)Y) zeolite with nitrogen at high temperature,Cu(Ⅰ)Y zeolite adsorbent was obtained.Gasoline desulfurization property of Cu(Ⅰ)Y zeolite adsorbent was investigated in a fixed-bed microreactor.Optimal conditions for hydrothermal ion exchange of Cu(Ⅱ)Y zeolite are 135℃,12h,concentration of Cu(NO_3)_2 solution 0.5mol/L and the ratio of NaY zeolite to Cu(NO_3)_2 solution 0.05.At temperature below 600℃,the higher the activation temperature and the longer the activation time are,the better the desulfurization property is.Optimal activation conditions for Cu(Ⅰ)Y zeolite adsorbent are nitrogen atmosphere,500℃ and 6h.Under the optimal conditions:normal pressure and temperature,and liquid hourly space velocity 10h~(-1),the saturation sulfur capacity of Cu(Ⅰ)Y zeolite adsorbent for model gasoline can reach 8.61%.