A Highly Stable and Magnetically Recyclable Nanocatalyst System: Mesoporous Silica Spheres Embedded with FeCo/Graphitic Shell Magnetic Nanoparticles and Pt Nanocatalysts

Abstract

We have developed a highly stable and magnetically recyclable nanocatalyst system for alkene hydrogenation. The materials are composed of mesoporous silica spheres (MSS) embedded with FeCo/graphitic shell (FeCo/GC) magnetic nanoparticles and Pt nanocatalysts (Pt-FeCo/GC@MSS). The Pt-FeCo/GC@MSS have superparamagnetism at room temperature and show type IV isotherm typical for mesoporous silica, thereby ensuring a large enough inner space (surface area of 235.3 m(2) g(-1), pore volume of 0.165 cm(3) g(-1), and pore diameter of 2.8 nm) to undergo catalytic reactions. We have shown that the Pt-FeCo/GC@MSS system readily converts cyclohexene into cyclohexane, which is the only product isolated and Pt-FeCo/GC@MSS can be seperated very quickly by an external magnetic field after the catalytic reaction is finished. We have demonstrated that the recycled Pt-FeCo/GC@MSS can be reused further for the same hydrogenation reaction at least four times without loss in the initial catalytic activity.

Surface distortion of FeRu nanoparticles improves the hydrogen evolution reaction performance in alkaline media

“…S1a and b†). 43 Fe(NO 3 ) 2 ·9H 2 O and RuCl 3 · x H 2 O dispersed in methanol were then impregnated in MSN by capillary force, 44–46 while the methanol solvent was evaporated. The resulting mixture of MSN and the metal precursors was heated from room temperature to 800 °C for 11 min under an H 2 atmosphere and then kept at 800 °C for 5 min.…”

Highly stable mesoporous silica nanospheres embedded with FeCo/graphitic shell nanocrystals as magnetically recyclable multifunctional adsorbents for wastewater treatment

“…The resulting 4.6 AE 0.8 nm FeCo/GC NCs with slight Fe richness have been reported to possess a single bcc FeCo phase and signicantly high saturation magnetization values (>200 emu g À1 at room temperature), which makes them suitable for magnetic separation. 42,43,48 The magnetic characterization of the FeCo/GC NCs@MSNs was investigated using a SQUID-VSM. As seen in Fig.…”

Magnetic Nanoparticle Composites: Synergistic Effects and Applications

“…The final Pt‐FeCo/GC@mSiO 2 displayed an excellent ability to catalyze cyclohexene hydrogenation, possessing high surface area and large pore volume. [ 134 ] Gold NPs were immobilized onto the surface of FePt@SiO 2 composites. A solution of gold NPs, which were formed by citrate reduction method, was mixed with amine‐functionalized FePt@SiO 2 to provide the final composite.…”