| 温度对MOF-74(Ni)吸附分离丙烯丙烷机理和选择性的影响 |
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| 引用本文： | 刘江,吴玉芳,许峰,肖静,夏启斌,李忠.温度对MOF-74(Ni)吸附分离丙烯丙烷机理和选择性的影响[J].化工学报,2016,67(5):1942-1948. |
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| 作者姓名： | 刘江 吴玉芳 许峰 肖静 夏启斌 李忠 |
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| 作者单位： | 华南理工大学化学与化工学院, 广东 广州 510640 |
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| 基金项目： | 国家自然科学基金重点项目(21436005)。 |
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| 摘 要： | 采用水热法成功制备了MOF-74(Ni),使用PXRD、孔径分析对材料进行了表征,测定了材料在不同温度下的C3H6和C3H8吸附等温线,应用程序升温脱附技术估算了脱附活化能,并使用IAST理论预测了材料对C3H6/C3H8二元体系的吸附选择性。讨论了温度对吸附机理和吸附选择性的影响。结果显示,MOF-74(Ni)的BET比表面积高达1306 m2·g-1。在298 K下,C3H6的吸附量高达7.4 mmol·g-1。随着温度升高,C3H8的吸附量大幅降低,而C3H6的吸附量下降程度较小,导致材料对C3H6/C3H8吸附选择性升高。当温度为328K时,MOF-74(Ni)对C3H6/C3H8二元气体混合物的吸附选择接近12。程序升温脱附的实验结果显示,C3H6在MOF-74(Ni)上的脱附活化能大于C3H8,分别为68.92 kJ·mol-1和50.80 kJ·mol-1。C3H6是通过与MOF-74(Ni)的不饱和金属位点Ni2+以p络合作用方式吸附,作用力较强,而C3H8与Ni2+之间的作用力较弱。根据吸附机理不同的特点,适当提高温度,将有助于提高MOF-74(Ni)吸附分离C3H6/C3H8混合物体系的吸附选择性。
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| 关 键 词： | MOF-74(Ni) 丙烯 丙烷 吸附等温线 吸附选择性 温度 |
| 收稿时间： | 2015-10-08 |
| 修稿时间： | 2015-11-04 |
Effects of temperature on adsorption mechanism and adsorption selectivity of C3H6 and C3H8 on MOF-74(Ni) |
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| LIU Jiang,WU Yufang,XU Feng,XIAO Jing,XIA Qibin,LI Zhong.Effects of temperature on adsorption mechanism and adsorption selectivity of C3H6 and C3H8 on MOF-74(Ni)[J].Journal of Chemical Industry and Engineering(China),2016,67(5):1942-1948. |
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| Authors: | LIU Jiang WU Yufang XU Feng XIAO Jing XIA Qibin LI Zhong |
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| Affiliation: | School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China |
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| Abstract: | MOF-74(Ni) was synthesized by solvothermal synthesis method and then characterized by PXRD and pore size analysis. Isotherms of C3H6 and C3H8 on the synthesized MOF-74(Ni) were measured at different temperatures. The temperature programmed desorption experiments were conducted to estimate the desorption activation energies of C3H6 and C3H8 on the MOF-74(Ni). IAST theory was applied to predict the adsorption selectivity of C3H6/C3H8 mixture. The effects of temperature on adsorption mechanism and adsorption selectivity were also discussed. Results showed that the as-synthesized MOF-74(Ni) had BET surfaces of 1306 m2·g-1, and its C3H6 adsorption capacity was up to 7.4 mmol·g-1 at 298 K. With rising temperature, the adsorption capacity of C3H8 on MIL-74(Ni) decreased sharply, while that of C3H6 decreased slightly, resulting in improvement of C3H6/C3H8 adsorption selectivity of MOF-74(Ni). It could be attributed to p-complexation bonding between C3H6 and MOF-74(Ni), which was stronger than the interaction of C3H8 with MOF-74(Ni). TPD results indicated that the desorption activation energy of C3H6 on MOF-74(Ni) was higher than that of C3H8, which were 68.92 kJ·mol-1 and 50.80 kJ·mol-1, respectively. |
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| Keywords: | MOF-74(Ni) propylene propane adsorption isotherms adsorption selectivity temperature |
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