Single-atom catalysts (SACs) have attracted much attention due to their outstanding catalytic performance in heterogeneous catalysis. Here, we report a template sacrificial method to fabricate an atomically dispersed Co catalyst; three kinds of silica templates with different microstructures (MCM-41, SBA-15, and FDU-12) were employed and the effect of pore structure of the templates on the dispersity of Co was investigated. The catalysts fabricated with different templates presented different Co dispersities, leading to distinguishing catalytic performance. The optimized Co 1 @NC-(SBA) catalyst with atomically dispersed Co displayed outstanding catalytic activity for the hydrodeoxygenation (HDO) of lignin-derived species as well as the hydrogenation of various nitroaromatics. The reaction mechanism of the HDO of vanillin was investigated by using density functional theory calculations as well.
The catalytic performance of metal
particles is closely related
to the particle size. In this article, ultrafine palladium nanoparticles
anchored on nitrogen-doping carbon support (Pd/N-XC72R) were fabricated,
wherein the N-XC72R was prepared through low-temperature annealing
of Vulcan XC72R carbon with urea at 300 °C. Nitrogen dopant on
the surface of carbon support can remarkably strengthen the affinity
of the metal nanoparticles onto the support. Compared with the Vulcan
XC-72R-supported Pd catalyst, the prepared Pd/N-XC72R delivered superior
catalytic activity for the transfer hydrogenation of nitroarenes with
formic acid as the hydrogen donor at ambient temperature. Our strategy
may provide an effective and feasible approach to fabricate N-functionalized
carbon materials and construct high-performance ultrasmall metal nanoparticle
heterogeneous catalysts.
The non‐precious metal catalysts with high catalytic activity is extremely desirable but still full of challenges. In this paper, CoCu bimetal immobilized on nitrogen‐doped porous carbon (CoCu‐N‐C) was prepared by an effective ligand‐stabilized pyrolysis strategy. CoCu‐N‐C exhibited excellent catalytic efficiency for the transfer hydrogenation of nitroarenes with ammonia borane as hydrogen source, which can be ascribed to the well dispersed metal nanoparticles, the synergetic interaction of CoCu bimetal and nitrogen‐doped carbon. The durability and recyclability experiments of the recycled CoCu‐N‐C catalyst indicated that no obvious change in catalytic performance was observed after five consecutive cycles. To gain insight into the catalytic mechanism of CoCu‐N‐C for the hydrogenation reaction, density functional theory calculations was also conducted. This work provides an universal approach for constructing highly efficient non‐precious metal heterogeneous catalysts and which may find diverse high performance applications.
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