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移动C₂H₂/CO₂吸附和分离在由分子旋转精细调节的柱层金属有机框架中

Li-Qiu Yang¹, Ying Wang¹, Wen-Yu Yuan¹

¹Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, China.

Small (Weinheim an der Bergstrasse, Germany)

|December 23, 2024

概括

具有旋转分子的柱层金属有机框架 (MOF) 允许可调节的C2H2/CO2分离. 较小的转子通过CO2选择性动态分离产生高纯度的C2H2,而较大的转子则有利于C2H2热力学分离.

科学领域:

材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.
分离科学分离科学

背景情况:

乙 (C2H2) 和二氧化碳 (CO2) 混合物的有效分离对于工业过程至关重要.
柱层金属有机框架 (MOF) 为气体分离提供可调节的吸附性能.

研究的目的:

为了研究分子转子尺寸对柱层MOF对C2H2/CO2吸附和分离的影响.
通过调整MOF结构内的分子旋转来实现可控的C2H2/CO2分离.

主要方法:

三种Zn-X-TRZ (TRZ = 1,2,4-triazole) MOF吸附剂的合成,具有不同的柱状旋转器:9,10-二碳酸 (ADC),1,4-纳二碳酸 (NDC) 和1,4-二碳酸 (BDC).
评估C2H2/CO2吸附热力学 (吸附热,IAST选择性) 和在298K的动态分离性能.

主要成果:

具有大型ADC转子的Zn-ADC-TRZ显示出优异的C2H2选择性热力学分离,但由于固态阻碍,其动态性能较差.
带有小型BDC转子的Zn-BDC-TRZ表现出适度的CO2选择性热力学分离和出色的动态分离,在70%的混合物中达到>99.5%的C2H2纯度.
带有中等NDC转子的Zn-NDC-TRZ由于平衡相互作用和固体阻碍而表现出不利的分离.

结论:

可控的C2H2/CO2吸附和分离通过调节柱层MOF中的分子旋转器旋转来实现.
该研究提供了一个设计MOF吸附剂的策略,具有量身定制的气体分离能力,从C2H2选择性转向CO2选择性分离.

关键词:

一,二,四-三醇的使用.9,10-二甲基碳氧酸 9,10-二甲基碳酸在C2H2/CO2分离过程中.分子旋转器分子旋转器柱子层金属有机框架

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