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liulp2008木虫 (小有名气)
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| The micropores (zeolitic pores) and mesopores (non-zeolitic pores) were characterized through N2 adsorption experiments, as shown in Table 1. The surface area of the geopolymer dramatically increases from 6.57 to 97.81 m2/g after the hydrothermal process. The micropore volume (t-plot method according to Lipens and de Boer) of the geopolymer dramatically increased from 0 to 0.049 cc/g, but the mesopore volume decreased from 0.035 cc/g to 0.004 cc/g (Barrett-Joiner-Halenda (BJH) desorption method). The external mesopore surface area of the geopolymer decreased from 6.57 to 2.16 m2/g after the hydrothermal process, likely due to grain reconstruction, precipitation, and dissolution during the crystallization process through which the geopolymer was transformed into a NaA zeolite. The mesopore size distribution of hydrothermal sample was obtained by the BJH（Barrett-Joiner- Halenda）method with desorption data, and is shown in the iconograph in Fig.4. The average mesopore diameter of the hydrothermal sample where Pore Diameter Dv(d) = 3.77 nm. In the zeolite membrane for pervaporation, the effect of the separation was determined by the non-zeolitic pores of the zeolites. Less non-zeolitic pores and smaller pore sizes resulted in a higher separation factor during the pervaporation process. In the self-supporting NaA membrane, the non-zeolitic pores were primarily mesopores. Table 1 presents the results from the BET measurements. |
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baoshanqiu
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liulp2008: 金币+26, 翻译EPI+1, ★★★★★最佳答案 2015-06-17 21:52:32
liulp2008: 金币+26, 翻译EPI+1, ★★★★★最佳答案 2015-06-17 21:52:32
| 微孔（沸石孔）和间孔（非沸石孔）的特性用氮吸附实验测定，如表1所示。经水温处理后地质聚合物的表面积由6.57急剧增加到97.81m2/g。地质聚合物微孔体积（根据Lipens 和 de Boert-点法）由0急剧增加到0.049cc/g, 而间孔体积由0.035cc/g减小到0.004cc/g(Barrett-Joiner-Halenda (BJH)解吸法）。地质聚合物外间孔表面积在水温处理后有6.57减小为2.16m2/g，可能由于在地质聚合物转化为NaA沸石的结晶过程中颗粒重建、沉淀和溶解造成。水温样品间孔大小的分布是用BJH（Barrett-Joiner- Halenda）法的解吸资料获得，见图4中的插图。水温样品间孔的平均直径Dv(d) = 3.77 nm。在全蒸发用的沸石膜中，分离效率是由沸石的非沸石孔决定的。在全蒸发过程中，非沸石孔越少和孔越小分离因子越高。在自身支持NaA膜中，非沸石孔是主要的间孔。表1为BET法测定的结果。 |
2楼2015-06-17 03:44:43
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