摘要
CO_(2)/C_(2)H_(2)的分子筛分分离是一种理想的工业中提纯C_(2)H_(2)的方式,但由于其分子截面积几乎相同,传统的二维受限筛分机制不适用CO_(2)/C_(2)H_(2)筛分分离,因此CO_(2)/C_(2)H_(2)的分子筛分分离被认为是不切实际的.本文通过在MOF中构建扭曲的孔道,提出了三维受限的筛分策略,并用于实现CO_(2)/C_(2)H_(2)的分子筛分分离.作为概念验证实验,Cu-Trz MOF表现出高效的CO_(2)吸附和对C_(2)H_(2)的尺寸排斥吸附.穿透实验进一步证实了Cu-Trz能够成功分离CO_(2)/C_(2)H_(2)混合物.密度泛函理论(DFT)计算表明,分子尺寸较长的C_(2)H_(2)在扭曲的孔道中受到较强的三维限制,而较短的CO_(2)分子则容易通过孔道.该工作不仅报道了一种用于CO_(2)/C_(2)H_(2)分离的分子筛分MOF,而且提供了一种分离具有相似横截面积的线性分子的新方法.
Acetylene(C_(2)H_(2))is one of the most important chemical raw materials and is widely used as a feedstock for the production of various fine chemicals and electronic materials[1].In industry,C2H2 is mainly produced through partial methane combustion and thermal hydrocarbon cracking[2],which is always accompanied by a low concentration of carbon dioxide(CO_(2))impurity,causing negative effects on follow-up utilization.
作者
朱合金
薛文娟
黄宏亮
蒋泽峰
郑铭泽
仲崇立
Hejin Zhu;Wenjuan Xue;Hongliang Huang;Zefeng Jiang;Mingze Zheng;Chongli Zhong(State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong Univerisy,Tianjin 300387,China;School of Chemical Engineering and Technology,Tiangong University,Tianjin 300387,China;School of Material Science and Engineering,Tiangong University,Tianjin 300387,China)
基金
supported by the National Key R&D Program of China(2021YFB3802200)
the National Natural Science Foundation of China(22038010,22141001,and 21978212)。
