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Molecular-level insights into the oxidative degradation of grafted amines

机译：接枝胺氧化降解的分子水平见解

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The oxidative degradation of CO2 adsorbents consisting of aminegrafted pore-expanded mesoporous MCM-41 silica was investigated. The adsorbents were treated under flowing air at various temperatures, and the degree of deactivation was evaluated through the measurement of their CO_2 adsorption capacity prior and subsequent to exposure to air. To decipher the chemical structure of surface species upon air-deactivation of grafted amines, a solvent extraction procedure was developed using a deuterated basic solution. The obtained solutions were analyzed by a variety of 1D and 2D NMR spectroscopy techniques, such as ~(29)Si, ~(13)C, ~1H, [ _1H, ~(15)N] HMBC, [~1H, ~(13)C] HMQC, COSY and DOSY. The surface species generated by oxidative degradation of amine-grafted silica were found to contain functional groups such as imine, amide and carboxylic groups. Several structural units were conclusively demonstrated.
机译：研究了由胺接枝的扩孔介孔MCM-41二氧化硅组成的CO2吸附剂的氧化降解。在各种温度下在流动的空气中对吸附剂进行处理，并通过测量暴露于空气之前和之后的CO_2吸附能力来评估失活程度。为了在接枝胺空气灭活后破译表面物质的化学结构，开发了一种使用氘代碱性溶液的溶剂萃取程序。通过多种1D和2D NMR光谱技术对获得的溶液进行分析，例如〜（29）Si，〜（13）C，〜1H，[_1H，〜（15）N] HMBC，[〜1H，〜（ 13）C] HMQC，COZY和DOSY。发现通过胺接枝的二氧化硅的氧化降解产生的表面物质包含诸如亚胺，酰胺和羧基的官能团。最终证明了几个结构单元。

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