在固体氨基吸收剂中"缺失"二碳酸的化学吸收反应
Chia-Hsin Chen1, Daphna Shimon1, Jason J Lee2
1Department of Chemistry , Washington University , 1 Brookings Drive , Saint Louis , Missouri 63130 , United States.
Journal of the American Chemical Society
|June 28, 2018
概括
一种新的核磁共振方法可以检测二氧化碳在二氧化上被氨酸捕获时形成的水合二氧化物种. 这种进步克服了标准技术的局限性,揭示了碳捕获材料中被忽视的二碳酸盐形成.
科学领域:
- 材料科学
- 化学学
- 光谱学
背景情况:
- 固体氨基吸附剂对于二氧化碳捕获至关重要.
- 在氨基上化学吸收二氧化碳可以形成各种物种,包括二氧化碳.
- 标准的固态核磁共振技术往往无法检测这些二碳酸盐物种.
研究的目的:
- 开发和应用一种新的固态核磁共振方法,用于检测在氨基移植上二氧化碳化学吸收过程中形成的水合二碳酸盐物种.
- 研究水在这些物种的形成和检测中的作用.
- 重新评估氨基基基材料中的二氧化碳吸附产品.
主要方法:
- 用氨基烯 (APS) 和二甲基胺烯 (DMAPS) 接种的 SBA-15 酸盐上的 13CO2 的化学吸收.
- 固态核磁共振 (NMR) 光谱使用布洛赫衰变 (脉冲获取) 序列与1H脱.
- 预先13C-1H HETCOR测量以探测质子二碳酸的合.
主要成果:
- 使用布洛赫衰变NMR序列成功识别了水合二碳酸盐物种,而这在标准的13C CPMAS中是不可能的.
- 发现水的存在有助于二碳酸盐的形成,并影响其动态运动,从而使直接检测到13C.
- 在结时观察到两种不同的二碳酸盐物种,表明不同的动态环境.
- 这项研究揭示了APS吸附剂中被忽视的二碳酸盐的存在,挑战了以前的假设.
结论:
- 一种简单的NMR技术 (布洛克衰变) 能够在基于氨基的二氧化碳吸附剂中常规检测到以前难以捉摸的水合二氧化碳物种.
- 水在这些二碳酸盐物种的形成和NMR检测性中起着至关重要的作用.
- 这一发现需要重新评估氨基的二氧化碳捕获机制,特别是在水分存在的情况下.
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