Engineering Iron–Nickel Nanoparticles for Magnetically Induced CO₂Methanation in Continuous Flow

Abstract

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 CO2 methanation, acting both as heating agent and catalyst. The organometallic synthesis of Fe30Ni70 NPs displaying high heating powers at low magnetic field amplitudes is described. The NPs are active but only slightly selective for CH4 after deposition on SiRAlOx owing to an iron‐rich shell (25 mL min−1, 25 mT, 300 kHz, conversion 71 %, methane selectivity 65 %). Proper surface engineering consisting of depositing a thin Ni layer leads to Fe30Ni70@Ni NPs displaying a very high activity for CO2 hydrogenation and a full selectivity. A quantitative yield in methane is obtained at low magnetic field and mild conditions (25 mL min−1, 19 mT, 300 kHz, conversion 100 %, methane selectivity 100 %).

Hydrodeoxygenation and hydrogenolysis of biomass-based materials using FeNi catalysts and magnetic induction

“…FeNi3@Ni NPs were prepared following the procedure recently reported by De Masi et al and is described in the supplementary information. 48 These particles can be obtained by reduction of the organometallic precursors {Fe[N(SiMe3)2]2}2 and Ni[ i PrNC(CH3)N i Pr]2, under H2 in the presence of palmitic acid. As prepared, the particles possess a Fe-Ni core with a Fe-rich surface.…”

Recent progress in materials development for CO2conversion: issues and challenges

“…18). 296 Fascinatingly, the Fe-Ni based bimetallic cluster also acted as a superior heating agent under a low magnetic field. Interestingly, bimetallic Au-Cu embedded Cu submicron arrays demonstrated the capability of ethanol formation through CO 2 reduction.…”

Magnetically Induced CO2Methanation Using Exchange‐Coupled Spinel Ferrites in Cuboctahedron‐Shaped Nanocrystals

“…Magnetically induced catalysis is based on the heat generated by magnetic nanoparticles (NPs) when exposed to an alternating magnetic field . Recently, it has been demonstrated that this approach can be used to perform heterogeneous reactions at high temperature, such as CO 2 hydrogenation, using Fe 2.2 C NPs as heating agents and Ni or Ru NPs supported on SiRAlOx as catalysts, or by using bimetallic FeNi alloys as both heating agent and catalyst . However, one important limitation of these metallic heating agents is that they are prone to oxidation, so that they must be handled under inert atmosphere to preserve their heating capacities.…”

“…[1][2][3] Recently, it has been demonstrated that this approach can be used to perform heterogeneous reactions at high temperature, such as CO 2 hydrogenation, using Fe 2.2 C NPs as heating agents and Ni or Ru NPs supported on SiRAlOx as catalysts, [3][4][5] or by using bimetallic FeNi alloys as both heating agent and catalyst. [6] However, one important limitation of these metallic heating agents is that they are prone to oxidation, so that they must be handled under inert atmosphere to preserve their heating capacities. Additionally, these materials sinter under the harsh reaction conditions (above 320-400 8C), which diminishes their heating performance, consequently excluding their recyclability.…”