Preparation and oxygen adsorption of deoxidation agent Fe-MOF-74 and its deactivation

doi:10.11949/j.issn.0438-1157.20150638<b></b>

Abstract

Abstract:

Open metal site metal organic frameworks (MOFs) Fe-MOF-74 can capture O₂ from air or other oxygen-contain environment under low pressure, which can be applied to deoxidation in some special area. In this work, Fe-MOF-74 was successfully synthesized using two kinds of inert gas protection methods: flowing argon protection and no-flowing argon protection. The crystal from the first method was bigger than that from the second one, and the oxygen adsorption volume was higher too. Lower oxygen adsorption volume in no-flowing argon protection indicates few presence of Fe²⁺. The oxygen adsorption and desorption were tested for five times. No open metal sites exist because the oxygen cannot be removed from Fe-MOF-74 at all, and the material cannot chemisorption O₂ anymore. The materials were exposed in the simulated air environments, which will be destroyed seriously in the water vapor atmosphere, it is therefore concluded that Fe-MOF-74 should not contact with water molecules.

Key words: deoxidation agent, metal-organic frameworks, synthesis, adsorbents, adsorption

摘要：

带有金属空位的金属有机骨架材料(MOFs)Fe-MOF-74具有低压下快速选择性捕捉氧气的性能,预示其在特殊领域的精脱氧方面具有较大的应用潜力。通过两种惰性气体保护方法成功合成了Fe-MOF-74材料,实验结果显示流动氩气保护得到的材料晶体较大,而且吸氧量更高;而固定模式填充氩气保护下的反应釜合成的材料晶形较差且吸氧量也相对较低,说明其活性金属空位Fe²⁺较少。5次氧气吸附测试后发现氧分子会完全占据金属空位且不能被脱除出来,同时也完全失去了再次吸氧的能力;但在低温下(液氮和干冰)氧气可以实现可逆吸脱附。模拟的空气气氛环境中,带有水蒸气的气氛对材料的失活影响更大,因此该材料在应用时应尽量避免与水分子接触。

关键词: 脱氧剂, 金属有机骨架, 合成, 吸附剂, 吸附

CLC Number:

TQ424

YANG Jiangfeng, OUYANG Kun, ZHANG Zhuoming, JIA Xiaoxia, LI Jinping. Preparation and oxygen adsorption of deoxidation agent Fe-MOF-74 and its deactivation[J]. CIESC Journal, 2015, 66(8): 3262-3267.

杨江峰, 欧阳坤, 张倬铭, 贾晓霞, 李晋平. 脱氧剂Fe-MOF-74的制备及氧气吸附失活规律[J]. 化工学报, 2015, 66(8): 3262-3267.

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