A comparative solid state 13C NMR and thermal study of CO2 capture by amidines PMDBD and DBN
作者:Fernanda Stuani Pereira、Deuber Lincon da Silva Agostini、Rafael Dias do Espírito Santo、Eduardo Ribeiro deAzevedo、Tito José Bonagamba、Aldo Eloizo Job、Eduardo René Pérez González
DOI:10.1039/c1gc15457e
日期:——
The present work shows study of the CO2 capture by amidines DBN and PMDBD using 13C solid-state NMR and thermal techniques. The solid state 13C NMR analyses demonstrate the formation of a single PMDBD-CO2 product which was assigned to stable bicarbonate. In the case of DBN, it is shown that two DBN-CO2 products are formed, which are suggested to be stable bicarbonate and unstable carbamate. The role of water in the DBN-CO2 capture as well as the stability of the products to environmental moisture was also investigated. The results suggest that the carbamate formation is favored in dry DBN, but in the presence of water it decompose to form bicarbonate. Thermal analysis shows a good gravimetric CO2 absorption of DBN. Release of CO2 was found to be almost quantitative from the PMDBDH+ bicarbonate about 110 °C.
本研究利用 13C 固态核磁共振和热技术对脒类化合物 DBN 和 PMDBD 捕获二氧化碳的情况进行了研究。固态 13C NMR 分析表明形成了单一的 PMDBD-CO2 产物,该产物被归类为稳定的碳酸氢盐。在 DBN 的情况下,研究表明形成了两种 DBN-CO2 产物,这两种产物被认为是稳定的碳酸氢盐和不稳定的氨基甲酸酯。还研究了水在 DBN-CO2 捕获过程中的作用以及产物对环境湿度的稳定性。结果表明,在干燥的 DBN 中有利于氨基甲酸酯的形成,但在有水的情况下,它会分解形成碳酸氢盐。热分析表明 DBN 具有良好的二氧化碳重力吸收能力。在 110 °C 左右,发现 PMDBDH+ 碳酸氢盐几乎定量释放二氧化碳。