Amine functionalized silica is an excellent sorbent for CO₂ and when combined with Pd it has been demonstrated to selectively hydrogenate chemisorbed CO₂ to methanol at a pressure of 1 bar H₂. Up to 25% of the irreversibly captured CO₂ could be converted by applying a dynamic switch between adsorption at 70 °C and conversion to methanol at 140 °C. The surface species, observed during sorption and reaction by IR spectroscopy, allowed to conclude that the reaction proceeds via formation of carbamates and their gradual reduction to methanol on sites located at the interface between the amine and Pd particles.

中文翻译：

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在双功能碱性金属催化剂上将 CO2 转化为甲醇

胺官能化二氧化硅是一种优异的 CO ₂吸附剂，当与 Pd 结合时，它已被证明可以在 1 bar H ₂的压力下将化学吸附的 CO ₂选择性氢化成甲醇。通过在 70 °C 下的吸附和在 140 °C 下转化为甲醇之间进行动态切换，可以转化高达 25% 的不可逆捕获的 CO ₂。通过红外光谱在吸附和反应过程中观察到的表面物质可以得出结论，反应是通过氨基甲酸酯的形成和它们在胺和 Pd 颗粒之间的界面处逐渐还原为甲醇而进行的。