De Masi Déborah, Asensio Juan M, Fazzini Pier-Francesco, Lacroix Lise-Marie, Chaudret Bruno
Université de Toulouse, INSA, LPCNO (Laboratoire de Physique et Chimie des Nano-Objets), CNRS, UMR 5215, 135 Avenue de Rangueil, 31077, Toulouse, France.
Angew Chem Int Ed Engl. 2020 Apr 6;59(15):6187-6191. doi: 10.1002/anie.201913865. Epub 2020 Feb 19.
Induction heating of magnetic nanoparticles (NPs) is a method to activate heterogeneous catalytic reactions. It requires nano-objects displaying high heating power and excellent catalytic activity. Here, using a surface engineering approach, bimetallic NPs are used for magnetically induced CO methanation, acting both as heating agent and catalyst. The organometallic synthesis of Fe Ni NPs displaying high heating powers at low magnetic field amplitudes is described. The NPs are active but only slightly selective for CH after deposition on SiRAlOx owing to an iron-rich shell (25 mL min , 25 mT, 300 kHz, conversion 71 %, methane selectivity 65 %). Proper surface engineering consisting of depositing a thin Ni layer leads to Fe Ni @Ni NPs displaying a very high activity for CO hydrogenation and a full selectivity. A quantitative yield in methane is obtained at low magnetic field and mild conditions (25 mL min , 19 mT, 300 kHz, conversion 100 %, methane selectivity 100 %).
磁性纳米颗粒（NPs）的感应加热是一种激活多相催化反应的方法。它需要具有高加热功率和优异催化活性的纳米物体。在此，采用表面工程方法，双金属纳米颗粒用于磁诱导的CO甲烷化反应，兼具加热剂和催化剂的作用。描述了在低磁场振幅下显示出高加热功率的FeNi纳米颗粒的有机金属合成。由于富含铁的壳层，纳米颗粒在沉积在SiRAlOx上后对CH具有活性但选择性仅略高（25 mL·min⁻¹，25 mT，300 kHz，转化率71%，甲烷选择性65%）。通过沉积薄镍层进行适当的表面工程处理，得到的FeNi@Ni纳米颗粒对CO加氢显示出非常高的活性和完全的选择性。在低磁场和温和条件下（25 mL·min⁻¹，19 mT，300 kHz，转化率100%，甲烷选择性100%）可获得定量的甲烷产率。
