中文摘要：

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 m^2·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 k J·mol^-1和50.80 k J·mol^-1。C3H6是通过与MOF-74（Ni）的不饱和金属位点Ni2＋以π络合作用方式吸附,作用力较强,而C3H8与Ni^2＋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。

英文摘要：

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 m^2·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 π-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 k J·mol^-1 and 50.80 k J·mol^-1, respectively.