He Peilei, Xu Biao, Xu Xiaobin, Song Li, Wang Xun
Department of Chemistry , Tsinghua University , Beijing , 100084 , China . Email:
National Synchrotron Radiation Laboratory , University of Science and Technology of China , Hefei , 230029 , China.
Chem Sci. 2016 Feb 1;7(2):1011-1015. doi: 10.1039/c5sc03554f. Epub 2015 Oct 26.
The challenge with single-atom catalysts (SACs) is in designing a highly definite structure with accurate location of the single atom and high catalytic efficiency. The noble metal substituted polyoxometalates seem to be a kind of SAC because of their well resolved crystal structure. Here, we got two kinds of assembly structures (nanorolls and hollow spindles) based on the palladium substituted Wells-Dawson polyoxometalate (Pd-POM), which consists of isolated Pd atoms. Both the nanorolls and hollow spindles showed high catalytic activity for both the Suzuki-Miyaura coupling reaction and semihydrogenation reaction. The difference of the chemical surroundings between the nanorolls and hollow spindles leads to their discrepancy in the catalytic activity of semihydrogenation.
单原子催化剂（SAC）面临的挑战在于设计一种具有高度确定性结构的催化剂，其中单个原子的位置要精确，且催化效率要高。由于其晶体结构清晰，贵金属取代的多金属氧酸盐似乎是一种单原子催化剂。在此，我们基于钯取代的韦尔斯-道森多金属氧酸盐（Pd-POM）获得了两种组装结构（纳米卷和空心纺锤体），该多金属氧酸盐由孤立的钯原子组成。纳米卷和空心纺锤体对铃木-宫浦偶联反应和半氢化反应均表现出高催化活性。纳米卷和空心纺锤体之间化学环境的差异导致它们在半氢化催化活性上存在差异。
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