在胺附属金属有机框架中溶解CO2的化学吸收
Alexander C Forse, Phillip J Milner1, Jung-Hoon Lee2
1Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|December 4, 2018
概括
研究人员使用金属有机框架研究碳捕获. 他们发现碳酸链主导了基材料的二氧化碳吸收,水影响了吸附机制,有助于缓解气候变化.
科学领域:
- 材料科学
- 化学学
- 环境科学
背景情况:
- 碳捕获和封存对于减缓气候变化至关重要.
- 需要节能吸附剂来促进CCS的广泛部署.
- 胺附加的金属有机框架 (MOF) 是有前途的,但需要对二氧化碳吸收的机制理解.
研究的目的:
- 综合研究二氧化碳化学吸收的分子机制.
- 区分不同的二氧化碳吸附产品并确定主要的途径.
- 阐明水在二氧化碳吸收机制中的作用.
主要方法:
- 使用多核磁共振 (NMR) 光谱.
- 执行了范德瓦尔斯校正密度函数理论 (DFT) 的计算.
- 研究了13种不同类型的胺-M2 (dobpdc) 框架.
主要成果:
- 作为二氧化碳化学吸收产品,成功区分了酸盐链和酸对.
- 已经证明,氨基碳酸盐链形成是二Mg2 ((dobpdc) 材料中的主要机制.
- 在dmpn-Mg2 ((dobpdc) 中发现了一种新的化学吸附机制,涉及1:1的产品混合物,解释了其独特的吸附特性.
- 证实了水在指导二氧化碳吸收途径中的重要作用.
结论:
- 结合NMR和DFT方法可以详细了解二氧化碳吸附在二-M2的框架.
- 这些发现澄清了二氧化碳化学吸收机制,为设计更高效的碳捕获吸附剂铺平了道路.
- 这项研究为研究类似的氨基功能化吸附剂提供了框架.
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