Ultra-deep desulfurization via reactive adsorption on Ni/ZnO: The effect of ZnO particle size on the adsorption performance
Ultra-deep desulfurization via reactive adsorption on Ni/ZnO: The effect of ZnO particle size on the adsorption performance
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DOI：
10.1016/j.apcatb.2012.02.004
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发表时间：
2012-05
影响因子：
22.1
通讯作者：
Yuliang Zhang;Yongxing Yang;Hongxian Han;Min Yang;Lu Wang;Yongna Zhang;Zongxuan Jiang;Can Li-Can-L
中科院分区：
文献类型：
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作者：
Yuliang Zhang;Yongxing Yang;Hongxian Han;Min Yang;Lu Wang;Yongna Zhang;Zongxuan Jiang;Can Li-Can-L
以噻吩为含硫化合物，采用固定床反应器考察了ZnO粒径对Ni/ZnO（5wt%NiO）吸附剂吸附脱硫性能的影响。采用浸渍法制备了不同ZnO粒径（8、12、20、30 nm）的Ni/ZnO吸附剂，并采用粉末X射线衍射（XRD）、高分辨透射电子显微镜（HRTEM）和透射电子显微镜（TEM）对其进行了表征。结果表明，随着ZnO粒径的减小，Ni/ZnO吸附剂对噻吩的吸附量显著增加。典型地，在1 mg/L的硫穿透水平下，来自模型汽油（500 mg/L）的Ni/ZnO（8 nm）的硫容量从84 mg硫/g吸附剂到接近0 mg硫/g吸附剂远高于Ni/ZnO（30 nm）。具有较小ZnO粒径的Ni/ZnO的这种较高的脱硫活性和硫容量可以来自于较高的Ni在ZnO上的分散和较低的H2中从Ni到ZnO的硫的传质限制。
The effect of ZnO particle size on the adsorptive desulfurization performance for Ni/ZnO (5wt% NiO) adsorbent was investigated using thiophene as a sulfur containing compound in model gasoline with a fixed bed reactor. The Ni/ZnO adsorbents with different ZnO particle sizes (8, 12, 20, 30nm) were prepared by an impregnation method and characterized by powder X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and transmission electron microscopy (TEM). It was found that the adsorption capacity of the Ni/ZnO adsorbent for thiophene significantly increased with the decrease of the ZnO particle sizes. Typically at a breakthrough sulfur level of 1mg/L, sulfur capacity of Ni/ZnO (8nm) from model gasoline (500mg/L) is much higher than that of Ni/ZnO (30nm) from 84mg sulfur per gram adsorbent to nearly 0mg sulfur per gram adsorbent. This higher desulfurization activity and sulfur capacity for Ni/ZnO with smaller ZnO particle sizes could be derived from higher Ni dispersion on ZnO and lower mass transfer limitations of sulfur to ZnO from Ni in H2.