Reductive amination of levulinic acid to different pyrrolidones on Ir/SiO 2 -SO 3 H: Elucidation of reaction mechanism
作者:José J. Martínez、Leonardo Silva、Hugo A. Rojas、Gustavo P. Romanelli、Lucas A. Santos、Teodorico C. Ramalho、María H. Brijaldo、Fabio B. Passos
DOI:10.1016/j.cattod.2017.08.038
日期:2017.11
transformation to different pyrrolidones via reductive amination was studied using an Ir/SiO2-SO3H catalyst in liquid phase. The effects of solvent, amine concentration, H2 partial pressure, catalyst mass, and reuse were studied. The spent catalysts were evaluated by DRIFTS to obtain evidence of the interaction of levulinic acid with aniline on the catalyst surface. The sulfonic groups on SiO2 improved the
研究了在液相中使用Ir / SiO 2 -SO 3 H催化剂通过还原胺化法将丙戊酸(LA)转化为不同的吡咯烷酮的方法。研究了溶剂,胺浓度,H 2分压,催化剂质量和再利用的影响。用DRIFTS评估用过的催化剂,以得到乙酰丙酸与苯胺在催化剂表面上相互作用的证据。SiO 2上的磺酸基提高了吡咯烷酮的收率,避免了副反应。提出了一种反应机理,其中在LA和胺之间发生还原胺化反应,然后将胺循环。评价了反应机理的吉布斯自由能。此外,采用密度泛函理论(DFT)和B3LYP-D3方法确定了胺反应物和中间体的HOMO和LUMO,以了解限速和环化步骤。