Selective reductive cleavage of C O bond in lignin model compounds over nitrogen-doped carbon-supported iron catalysts
作者:Jiang Li、Hui Sun、Jia-xing Liu、Jun-jie Zhang、Zhen-xing Li、Yao Fu
DOI:10.1016/j.mcat.2018.03.014
日期:2018.6
promising resource to produce fuels and aromatic chemicals. The selective cleavage of CO bond while preserving the aromatic nature has become one of the major challenges in the catalytic valorization of lignin to aromatic chemicals. In this work, we report that the selective reductive cleavage of CO bond in lignin model compounds can be successfully achieved through heterogeneous iron catalysis. The hydrogenolysis
木质素最近作为一种有前途的生产燃料和芳香族化学品的资源而受到了广泛的关注。在保持芳族性质的同时,C O键的选择性裂解已成为木质素催化芳香化成芳族化合物的主要挑战之一。在这项工作中,我们报道了C的选择性还原裂解木质素模型化合物中的O键可通过多相铁催化成功实现。α-O-4型键的氢解反应表明,在800°C的条件下,乙酸铁和1,10-菲咯啉在活性炭上同时热解制备的铁催化剂是活性最高的铁催化剂,苯酚和甲苯的收率为95%和90%。发现该芳族化合物的选择性比在贵金属催化剂上获得的要高得多。通过各种技术尤其是XPS和H 2 -TPR证实了N⋯Fe物种作为多相铁催化剂活性中心的存在。对于β-O-4模型连接,邻位OH基对于铁催化的醚键氢解至关重要。β-O-4模型化合物中α-碳的氧化可显着降低醚键的键解离能,从而以中等至极好的收率得到解聚产物。