Kojima Takayuki, Kameoka Satoshi, Fujii Shinpei, Ueda Shigenori, Tsai An-Pang
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan.
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
Sci Adv. 2018 Oct 19;4(10):eaat6063. doi: 10.1126/sciadv.aat6063. eCollection 2018 Oct.
Heusler alloys ( ) are well-established intermetallic compound materials in various fields because their function can be precisely adjusted by elemental substitution (e.g., ' ). Although intermetallic compound catalysts started attracting attention recently, catalysis researchers are not familiar with Heusler alloys. We report their potential as novel catalysts focusing on the selective hydrogenation of alkynes. We found that CoMnGe and CoFeGe alloys have great alkene selectivity. Mutual substitution of Mn and Fe (CoMn Fe Ge) enhanced the reaction rate without changing selectivity. The substitution of Ga for Ge decreased the selectivity but increased the reaction rate monotonically with Ga composition. Elucidation of these mechanisms revealed that the fine tuning of catalytic properties is possible in Heusler alloys by separately using ligand and ensemble effects of elemental substitution.
赫斯勒合金（ ）是各个领域中成熟的金属间化合物材料，因为其功能可通过元素取代（例如， ' ）进行精确调整。尽管金属间化合物催化剂最近开始受到关注，但催化研究人员对赫斯勒合金并不熟悉。我们报道了它们作为新型催化剂在炔烃选择性加氢方面的潜力。我们发现CoMnGe和CoFeGe合金具有很高的烯烃选择性。Mn和Fe的相互取代（CoMn Fe Ge）提高了反应速率，而选择性不变。用Ga取代Ge降低了选择性，但随着Ga含量的增加反应速率单调增加。对这些机理的阐明表明，通过分别利用元素取代的配体效应和整体效应，可以对赫斯勒合金的催化性能进行微调。
