Copper-Based Intermetallic Electride Catalyst for Chemoselective Hydrogenation Reactions
作者:Tian-Nan Ye、Yangfan Lu、Jiang Li、Takuya Nakao、Hongsheng Yang、Tomofumi Tada、Masaaki Kitano、Hideo Hosono
DOI:10.1021/jacs.7b08252
日期:2017.11.29
The development of transition metal intermetallic compounds, in which active sites are incorporated in lattice frameworks, has great potential for modulating the local structure and the electronic properties of active sites, and enhancing the catalytic activity and stability. Here we report that a new copper-based intermetallic electride catalyst, LaCu0.67Si1.33, in which Cu sites activated by anionic
过渡金属间化合物的开发,其中活性位点并入晶格骨架中,具有很大的潜力来调节活性位点的局部结构和电子性质,并增强催化活性和稳定性。在这里,我们报道了一种新型的铜基金属间电催化剂LaCu 0.67 Si 1.33,其中具有低功函的阴离子电子激活的Cu位原子原子地分散在晶格骨架中,并提供硝基芳烃的选择性加氢,其营业额高40倍以上频率(TOF高达5084 h –1),而不是经过深入研究的金属负载催化剂。利用同位素效应的动力学分析表明,氢键的裂解是决定速率的步骤。出乎意料的是,LaCu 0.67 Si 1.33的高载流子密度和低逸出功(LWF)特性使得能够以极低的活化能(E a = 14.8 kJ·mol –1)活化氢分子。此外,LaCu 0.67 Si 1.33的高氧亲合力可实现通过硝基优先吸附硝基芳烃表面,导致高化学选择性。本发明的有效催化剂可以进一步引发具有高活性的其他含氧官能团例如醛和酮的氢化