Bimetallic‐organic Frameworks CoMo‐ZIF‐67: An Efficient and Stable Catalyst for Selective Oxidation of Alkenes

Abstract

Developing catalysts for the selective oxidation of alkenes with environment‐friendly, unique structural characteristics, high economic benefit and better catalytic performance is important. Herein, we employed ZIF‐67 as the sacrificial template to synthesize bimetallic‐organic frameworks CoxMo100‐x‐ZIF nanocages by a facile dissolution‐regrowth strategy. The Co51.8Mo48.2‐ZIF catalyst was tested under various experimental parameters for the selective oxidation of cyclooctene to screen the optimal reaction conditions. Under the optimal reaction conditions, Co51.8Mo48.2‐ZIF nanocages exhibited a high cyclooctene conversion of 99.3 % and a selectivity of 99.0 % to epoxy cyclooctane. Furthermore, Co51.8Mo48.2‐ZIF nanocages can maintain their catalytic performance after reused five catalytic cycles. This bimetallic catalyst could also be used for the epoxidation of a wide range of alkenes, such as hexene or cyclohexene. In addition, the kinetic studies were conducted, and a reasonable reaction mechanism was proposed based on density functional theory calculations. The outstanding catalytic performance of CoxMo100‐x‐ZIF nanocages can be attributed to the cooperativity between Co and Mo sites and the hollow structure with high surface areas.

An Overview of Heterogeneous Transition Metal‐Based Catalysts for Cyclohexene Epoxidation Reaction

“…In addition, the catalytic performance of Co 51.8 Mo 48.2 -ZIF nanocages was still maintained after repeated use for 5 catalytic cycles. [91] CoxMo100-x-ZIF nanocages have excellent catalytic performance, mainly due to the synergistic effect of Co and Mo sites and high specific surface area hollow structure. 20.…”

Mn Deposited Co3O4 Hollow Microcages Derived from ZIF‐67 for Efficient CO Low‐temperature Oxidation

“…Zeolite imidazole frameworks (ZIFs), which assembled from metal ions as centers and organic ligands through coordination reactions, are ideal candidates for hollow structure catalysts with high surface area and specific lattice order. [19] Therefore, ZIFs materials have been widely studied in electrocatalysis, [20][21][22] alkenes epoxidation [23][24][25] and desulfurization. [26][27][28][29] Although a mass of ZIFs-derived catalysts have been reported, researches on ZIFs as templates to prepare hollow dioxygen compounds for CO low-temperature catalytic oxidation are rare.…”

Metal-Organic Framework Supporting Fe3O4 Prepared by Microwave in Couple With NTP to Eliminate VOCs From Biofuel

“…Metal-Organic Frameworks (MOFs) can be used as catalysts in NTP synergistic catalytic reactions due to their active chemical properties and controllable structure (Zhang et al, 2018;Vakili et al, 2020). MOFs are a new class of porous frameworks formed by the self-assembly reaction of metal ions and organic ligands (Guo Y. et al, 2021). Yaghi's group (Yaghi et al, 1995;Furukawa et al, 2013) reported the successful preparation of MOFs, which aroused great research interest from scholars all over the world, and made MOFs enter a stage of rapid development (Li H.-Y.…”

“…W.H. Zou et al (Zou et al, 2021) prepared the new material by adding Mo into the structure of ZIF-67 to form abundant catalytic active centers and hollow structure, which exhibited excellent catalytic performance. The solvothermal synthesis method is simple in operation and easy to control the preparation conditions, and is the most commonly used method for the preparation of MOFs.…”