Pei Yuchen, Chen Minda, Zhong Xiaoliang, Zhao Tommy Yunpu, Ferrer Maria-Jose, Maligal-Ganesh Raghu V, Ma Tao, Zhang Biying, Qi Zhiyuan, Zhou Lin, Bowers Clifford R, Liu Cong, Huang Wenyu
Department of Chemistry, Iowa State University, Ames, IA 50011, USA.
Nanoscale. 2020 Apr 21;12(15):8519-8524. doi: 10.1039/d0nr00920b. Epub 2020 Apr 3.
The molecular basis for the high cis-alkene selectivity over intermetallic PtSn for alkyne semi-hydrogenation is demonstrated. Unlike the universal assumption that the bimetallic surface is saturated with atomic hydrogen, molecular hydrogen has a higher barrier for dissociative adsorption on intermetallic PtSn due to the deficiency of Pt three-fold sites. The resulting molecular behavior of adsorbed hydrogen on intermetallic PtSn nanoparticles leads to pairwise-hydrogenation of three alkynes to the corresponding cis-alkenes, satisfying both high stereoselectivity and high chemoselectivity.
证明了在炔烃半加氢反应中，相对于金属间化合物PtSn，具有高顺式烯烃选择性的分子基础。与双金属表面被原子氢饱和的普遍假设不同，由于Pt三重位点的缺乏，分子氢在金属间化合物PtSn上的解离吸附具有更高的势垒。在金属间化合物PtSn纳米颗粒上吸附氢的这种分子行为导致三种炔烃成对氢化成相应的顺式烯烃，同时满足高立体选择性和高化学选择性。
