苯在Silicalite-1分子筛上的吸附
Adsorption of Benzene in Silicalite- 1 Zeolites
查看参考文献12篇
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文摘
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采用重量法测定了不同温度下苯在Silicalite-1分子筛上的吸附等温线及热力学参数,考察了苯在Silicalite-1上的吸附性能.考察结果表明,苯在Silicalite-1上吸附行为很复杂,苯分子首先吸附在Silicalite-1分子筛的交叉孔道处,其次是直孔道和正弦孔道.当吸附量大于4m.(u.c.)-1时,吸附在分子筛孔道的苯分子发生了重排.苯在Silicalite-1分子筛的吸附量随温度的降低而增加,吸附等温线的形状由Ⅰ型过渡为Ⅳ型,并有滞后环出现.根据苯在Silicalitc-1上的吸附等温线而计算出相应的吸附热力学参数(吸附热(Qst)、自由能变(△G)、熵变(△S)、熵(Sa))可知,吸附量的大小对热力学参数的影响很大.由于吸附质的吸附量的不同,吸附质-吸附质和吸附质-吸附剂之间的相互作用力也不同,苯在Silicalite-1上的Qst△G、△S、Sa随吸附量的变化曲线复杂. |
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其他语种文摘
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Adsorption isotherms and thermodynamic properties of benzene in Silicalite - 1 zeolites were deter-mined systematically in a gravimetric system, and the adsorption properties of benzene in Silicalite - 1 zeolites were also investigated. The results show that the adsorption properties of benzene in Silcalite- 1 are complicat-ed. Firstly Benzene is adsorbed in the intersection channel. Then it can be adsorbed in the straight channel and the sinusoidal channel. When the loading of benzene in Silicalite- 1 is larger than 4 m. (u. c. ) ~', the benzene molecules adsorbed in the Silicalite - 1 zeolites channel are rearranged. Meanwhile, the loading of benzene in Sil-icalite" t zeolites increases with decreasing temperature. Meanwhile, the types of the isotherms change from type I to type IV with decreasing temperature. The thermodynamic properties (Qs,, AG , AS, SJ are also studied according to the isotherms of benzene in Silicalite - 1 at different temperatures and different loading. The results show that the loading of adsorbate molecule has great effect on the thermodynamic properties. The de-em-e erf ihtrmudynamie properties ? Q,t,AG .AS , S\,) of benzene on loading shows a sharp increase and decrease because of the loading and interaction of sorbate - sorbate and sorbate - sorbent. |
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来源
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石油化工高等学校学报
,2004,17(3):17-19 【扩展库】
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关键词
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重量法
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苯
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吸附等温线
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热力学性能
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地址
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1.
辽宁石油化工大学石油化工学院, 辽宁, 抚顺, 113001
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兰州大学, 甘肃, 兰州, 730000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1006-396X |
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学科
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化学工业 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:1664747
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参考文献 共
12
共1页
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