Highly efficient Nb2O5 catalyst for aldol condensation of biomass-derived carbonyl molecules to fuel precursors
作者:Yaxuan Jing、Yu Xin、Yong Guo、Xiaohui Liu、Yanqin Wang
DOI:10.1016/s1872-2067(19)63371-1
日期:2019.8
increasing attention. Here we report a Nb 2 O 5 catalyst with excellent activity and stability in the aldol condensation of biomass-derived carbonyl molecules. It is found that in the aldol condensation of furfural with 4-heptanone, Nb 2 O 5 has obviously superior activity, which is not only better than that of other common solid acid catalysts (ZrO 2 and Al 2 O 3 ), more importantly, but also better
摘要 羟醛缩合对于从生物质衍生的化学品生产燃料前体具有重要意义,并受到越来越多的关注。在这里,我们报告了一种在生物质衍生的羰基分子的羟醛缩合中具有优异活性和稳定性的 Nb 2 O 5 催化剂。发现在糠醛与4-庚酮的羟醛缩合反应中,Nb 2 O 5 具有明显优越的活性,不仅优于其他常用固体酸催化剂(ZrO 2 和Al 2 O 3 ),更重要的是,但也优于固体碱催化剂(MgO、CaO 和镁铝水滑石)。N 2 吸附/解吸、NH 3 -TPD、Py-FTIR 和丙酮吸附的 DRIFTS 研究的详细表征表明,Nb 2 O 5 具有很强的激活羰基分子中 C=O 键的能力,这有助于生成金属烯醇中间体并进行亲核加成以形成新的 C-C 键。此外,Nb 2 O 5 对羟醛缩合的适用性扩展到其他生物质衍生的羰基分子,并且获得了高产率的目标燃料前体。最后,制备了一种多功能Pd/Nb 2 O 5 催化剂,并通过将羟