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 %).

Structured Ni@NaA zeolite supported on silicon carbide foam catalysts for catalytic carbon dioxide methanation

“…Importantly, in situ infrared thermography was employed to examine the surface temperatures and development of hotspots due to the exothermicity of the reaction on structured catalysts based on different foams, showing that both SiC and aluminium foams (with the intrinsically high thermal conductivity) presented the improved heat transfer than alumina foams. In addition, electromagnetic induction heating was applied to regulate heat transfer in structured catalysts (e.g., Ni supported on carbon felt) for catalytic CO 2 methanation process, being able to improve heating/cooling rates with uniform heating environments and high energy efficiency 24‐28 …”

FeNi3 and Ni-Based Nanoparticles as Electrocatalysts for Magnetically Enhanced Alkaline Water Electrolysis

“…The same properties have even been reached with stainless steel electrodes, upon proper electrochemical activation [22,23]. The choice of FeNi3 comes from its good heating properties and activity for the Sabatier reaction [24]. In this study, the electrochemical activity of the materials has been measured with a RDE.…”

“…Ni peaks. A Mössbauer study was also undertaken to confirm the FeNi3 material, and will be further reported [24]. with the synthesis routes employed (2.8 at.% of Pt, which corresponds to ~ 0.01 wt.% of Pt, was used to start the nucleation for Ni NPs syntheses).…”

“…A loading survey was made, this time on FeNi3. More specifically, FeNi3 was preferred to FeNi3@Ni because its synthesis is twice shorter and its heating properties are slightly better [24]. Figure 7(c) indicates that the activity of FeNi3 increases from 20 to 100 µg/cm² and then decreases from 100 to 5000 µg/cm² for FeNi3 [37] [38].…”

Bimetallic Nanoparticles Associating Noble Metals and First-Row Transition Metals in Catalysis

“…42 Here, all the phenomena of alloying, dealloying, and oxidation that we have highlighted in this Perspective can be present and can participate in the catalysis under the magnetic stimulus. [37][38][39][40][41][42]…”