Experimental and theoretical evidence suggests carbamate intermediates play a key role in CO2 sequestration catalysed by sterically hindered amines
作者:Phil Jackson
DOI:10.1007/s11224-014-0431-5
日期:2014.10
comparable to the MEA value (45 kJ mol−1), whereas the primary amines with tertiary alpha carbons have slightly larger values (60–70 kJ mol−1). The organic amine values are much lower than the value for ammonia (93 kJ mol−1). The results indicate CO2 chemisorption proceeds via a carbamate intermediate for all aqueous primary and secondary amines. Hindered carbamates are susceptible to further chemical
水位阻胺对 CO2 的化学吸附已在实验和理论上进行了研究。对含有空间位阻胺和 13CO2 源的溶液进行负离子 ESI-MS 分析显示对应于 [M-H + 45]- 的峰。这些离子在受到碰撞活化时很容易损失 45 Da,并且与其他关键碎片一起证实了 13C 标记的氨基甲酸酯衍生物的生成。两个关键捕获反应的热化学:$$2.\textamine }} + \text CO}}_ 2} \leftrightarrows }\textamine}} - \textCO}} _ 2}^ - } + \text amine}} - \textH}}^ + } \kern 1pt} \quad 1:\textcarbam}}$$2.amine+CO2 ⇆胺-CO2-+胺-H+1:carbam$$\textamine }} + \text CO}}_ 2}