Recent Advancements in Graphene‐Based Supports of Metal Complexes/Oxides for Epoxidation of Alkenes

Abstract

In the past decade, there has been great progress in the preparation and catalytic applications of graphenesupported metal complexes/oxide catalysts. Graphene-based materials have attracted tremendous research interest owing to special physicochemical properties, for example, unique two-dimensional structure, high theoretical specific surface area, high electrical conductivity,a nd outstanding acid-base resistance properties. Graphene-supported metal complexes/ oxides have been extensively investigated, and exhibit good catalytic activity and stability in water splitting (H 2 generation or oxygen evolution), oxidation/epoxidation of alkenes, CÀCb ond formation,a nd so forth. Herein,r ecent develop-mentsi ng raphene-supported metal complexes/oxides for the catalytic epoxidation of different alkenes are summarized. Site isolation and synergistici nteractions between metal complexes/oxides and graphene are the two key roles for enhancing the catalytic activity,w hereas the hydrophobicity of the support can efficiently improve epoxide selectivity.I na ddition, the possible mechanismso fc atalytic epoxidationa re summarized. This review provides af easible schemef or the potentiala pplication of graphene-based materials and guidance for the rational design of heterogeneous catalysts for catalytic applications.

Role of Organic Fluoride Salts in Stabilizing Niobium Oxo-Clusters Catalyzing Epoxidation

“…For the epoxidation of allylic alcohols or olefins with H 2 O 2 as an oxygen source, the use of catalysts including metal oxides, 10,11 transition-metal compounds, 12−14 and molecular sieves 15−17 is very common. Especially, titanium silicalite (TS-1) has been found to be a unique material that enables effective transformation of olefins into epoxides since the 1980s.…”

“…For the epoxidation of allylic alcohols or olefins with H 2 O 2 as an oxygen source, the use of catalysts including metal oxides, , transition-metal compounds, − and molecular sieves − is very common. Especially, titanium silicalite (TS-1) has been found to be a unique material that enables effective transformation of olefins into epoxides since the 1980s. − In recent years, group V transition-metal catalysts have attracted immense attention in selective oxidation. , For example, the application of vanadium compounds in oxidation catalysis has been reported in many studies, including alkane oxidation, alcohol oxidation, olefin epoxidation, , lignin degradation by oxidation, etc .…”

Investigation into Enhanced Catalytic Performance for Epoxidation of Styrene over LaSrCoxFe2–xO6 Double Perovskites: The Role of Singlet Oxygen Species Promoted by the Photothermal Effect

“…The present potential approaches for replacing conventional methods normally involve peroxides as sacrificial oxidizing agents. Among the developed catalysts, heterogeneously transition-metal-based catalysts such as Co/Fe/Mn/W-based oxides are promising alternatives for their good oxidation activity, recyclable nature, and cost-effectiveness . For example, Liu et al reported the 79.7% yield and 82.7% selectivity of SO for the CoFe 2 O 4 catalyst using tertiary butyl hydroperoxide (TBHP) as an oxidant.…”

Synthesis of GO-SalenMn and Asymmetric Catalytic Olefin Epoxidation

“…In recent years, GO has been widely researched as a promising catalyst carrier [16], mainly because of its unique two-dimensional planar structure (which is beneficial to improve the dispersion of catalytic active species on the surface), higher specific surface area (which is beneficial to increase its forces with active species and, to a certain extent, prevent the migration and leaching of active species in the reaction process), and the nanometer size effect (which can improve the catalytic reaction rate). In addition, the surface of GO contains a large amount of oxygen-containing active groups, such as carboxyl, hydroxyl, and epoxy groups, which are easy to chemically modify [17] and can react with noble metal catalysts and homogeneous ligands to obtain various supported catalysts with different coordination modes.…”