含铝MOFs材料的合成及吸附性能实验

Synthesis and Adsorption Properties Experimental of Aluminum-containing MOFs

采用水热法合成了一种新的含铝多孔金属有机骨架材料(Metal-organic frameworks,MOFs)Al12O(OH)18(H2O)3(Al2(OH)4)[btc]6.24H2O(MIL-96(Al)),并用高压吸附仪测试了MIL-96在不同压力和温度下对CO2和SO2的吸附性能。结果表明,该配合物BET和Langmuir比表面积分别为507m2/g和668m2/g,热稳定性较好,温度低于350℃时结构较稳定。在相同温度和压力条件下,MIL-96对CO2的吸附性能远远高于对SO2的吸附性能;在较低温度下,温度越高,MIL-96吸附能力越强,但在100℃时的饱和吸附量(4.27mmol/g)小于80℃时的饱和吸附量(5.15mmol/g),这种现象是由于水蒸气的逸出造成的。

A new alumintun-contained porous metal organic framework materials （MOFs） Al12O（OH）18（H2O）3（Al2（OH）4）Ebtc]6·24H2O（MIL-96（Al）） was synthesized by hydrothermal method. COz and SO2 adsorption pro- perties of the material were tested by high-pressure adsorption instrument under different pressures and temperatures. The results show that the MIL-96 adsorbs nitrogen readily at liquid nitrogen temperature to show permanent porosity （SUET= 507m2/g, ＆＊ngmuir 668m2/g）. The thermo-gravimetric analysis （TGA） pattern shows that the material is stable up to 350℃. On the same conditions, the adsorption performance of CO2 is far superior to SO2. The adsorption capacity increases with temperature increases. Very interestingly, the saturated adsorption amount （4. 27mmol/g） at 100℃ is less than the one at 80℃ （5.15mmol/g）. This phenomenon is caused by the escape of water vapor.