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.

Ag–Pd alloys deposited on an amine-functionalized UiO-66(NH2–UiO-66) have been successfully prepared via a pre-coordination method and used as a AgPd@NH2–UiO-66 catalyst with 100% H2 selectivity and a high catalytic activity.

In this paper, N-heterocyclic carbene-palladium complex (NHC-Pd 2+ ) was immobilized onto the surface of graphene oxide by a chemical bonding method for the first time. The resultant graphene oxidesupported NHC-Pd 2+ composite (GO-supported NHC-Pd 2+ ) was characterized by transmission electron microscopy, X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy and infrared spectroscopy. It was demonstrated that the GO-supported NHC-Pd 2+ can act as an efficient catalyst for the Suzuki-10 Miyaura coupling reactions. The yields of the products were in the range from 83% to 96%. The catalyst can be readily recovered and reused at least for 6 consecutive cycles without a significant loss of its catalytic activity. Pd 111Intensity (a.u.) Two-Theta (degree)Graphical Abstract:In this paper, N-heterocyclic carbene-palladium complex was immobilized onto the surface of graphene oxide by a chemical bonding method for the first time. It was demonstrated that the GO-supported NHC-Pd 2+ can act as an efficient catalyst for the Suzuki-Miyaura coupling reactions.

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