CHAPTER 23. The Nature of Hydrogen Bonding in Adsorbed CO2 and H2O on Solid Amines in CO2 Capture

Y. Zhai, S. Wang, S. Chuang
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引用次数: 2

Abstract

CO2 capture from fossil fuel (coal and natural gas) power plants has been considered a key strategy in mitigating global climate changes. One promising approach under development is the use of solid amine sorbents to bind CO2 in the form of ammonium carbamate from the flue gas of coal-fired power plants in a CO2 capture process. The CO2 capture process by solid amines consists of a number of steps: CO2 adsorption, diffusion and desorption. These steps are governed by the nature of the hydrogen bonding between the ammonium cation and the carbamate anion. This chapter discusses the sources of greenhouse gas emissions, basic principles governing the trapping of infrared energy by greenhouse gases, especially CO2, and the mechanistic step involved in the thermal swing CO2 capture process by solid amines. Infrared spectroscopy is used to illustrate the nature of hydrogen bonding in adsorbed CO2 (i.e. ammonium carbamate) and co-adsorbed CO2/H2O (i.e. hydronium carbamate). In situ infrared spectroscopy shows that hydrogen bonding interactions among these adsorbed species shift the stretching band of N–H and O–H to lower wavenumbers. The extent of hydrogen bonding is reflected in the degree of shift and broadness of the N–H and O–H stretching bands. Fine tuning solid amine (immobilized amine) sorbents for CO2 capture processes requires controlling the structure of amine sites to facilitate CO2 adsorption, diffusion and desorption.
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23章。CO2捕集中固体胺吸附CO2和H2O的氢键性质
从化石燃料(煤和天然气)发电厂捕获二氧化碳被认为是减缓全球气候变化的关键策略。正在开发的一种有希望的方法是在二氧化碳捕获过程中使用固体胺吸附剂将燃煤电厂烟气中的氨基甲酸铵形式的二氧化碳结合起来。固体胺捕获CO2的过程包括CO2吸附、扩散和解吸几个步骤。这些步骤是由铵离子和氨基甲酸盐阴离子之间的氢键性质决定的。本章讨论了温室气体排放的来源,控制温室气体,特别是CO2捕获红外能量的基本原理,以及固体胺捕获CO2过程中涉及的热摇摆机制步骤。红外光谱用于说明吸附CO2(即氨基甲酸铵)和共吸附CO2/H2O(即氨基甲酸氢铵)中氢键的性质。原位红外光谱分析表明,这些吸附物质之间的氢键相互作用使N-H和O-H的拉伸带向较低的波数移动。氢键的程度反映在N-H和O-H拉伸带的移位程度和宽度上。用于CO2捕获过程的固体胺(固定胺)吸附剂的微调需要控制胺位点的结构,以促进CO2的吸附、扩散和解吸。
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