Atomically Dispersed Co Catalyst for Efficient Hydrodeoxygenation of Lignin-Derived Species and Hydrogenation of Nitroaromatics

Abstract

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.

Efficient single-atom Ni for catalytic transfer hydrogenation of furfural to furfuryl alcohol

“…43 The advantage of pyridine N can be coordinated with metal atom and used as anchor points to more effectively stabilize the atomically dispersed nickel sites. 44 In Figure S8, the pyridinic-N binding energy of NC was 398.3 eV and 0.4 eV less binding energy relative to Ni-SAs/NC. We think that electron transfer occurs at the coordination of Ni and pyridine-N, caused an increase in the electron density at the center of the Ni.…”

PdAg Nanoparticles Supported on Bipyridine‐Based Porous Organic Polymers: An Effective Bimetallic Catalyst for the Hydrodeoxygenation of Vanillin

“…The loss in mass balance can be ascribed to the polymerization of the substrates and the formation of oligomer. [ 23 ] With methanol and isopropanol as the solvent, although the mass balance was 100%, but the yield of MMP was only 9.8% and 9.3%, respectively. Meanwhile, the conversion of vanillin was relative low and large amount of intermediate product including DMP and HMP were formed.…”

Synthesis Strategies, Catalytic Applications, and Performance Regulation of Single‐Atom Catalysts

“…Recently, various metals (e.g., Fe, Pt, Pd, Rh, Co, and Sn) based SACs were also applied in the reduction of nitro groups. [ 22,193–197 ] For example, Wang and co‐workers demonstrated that carbon‐shells‐confined Pd SAC is catalytically active to 4‐nitrophenol (4‐NP) reduction 4‐aminophenol (4‐AP) and Suzuki coupling reactions. In addition, the maximum atomic efficiency (activity platform) of the SAC can be achieved when using 4‐NP reduction as a model reaction ( Figure ).…”