Ionic liquid-stabilized vanadium oxo-clusters catalyzing alkane oxidation by regulating oligovanadates

Abstract

The alkane oxidation under mild conditions occupies an important position in the chemical industry. Herewith, we have designed a novel class of ionic liquid ([TBA][Pic])-stabilized vanadium oxo-clusters (TBA=tetrabutylammonium; Pic= picolinate...

Phase-dependent photocatalytic selective oxidation of cyclohexane over copper vanadates

“…The selective oxidation of saturated C-H bonds is one of the most challenging subjects in modern catalytic chemistry due to the high bond energy, low polarity and the need to prevent overoxidation of intermediate products. 1,2 Despite many difficulties, the selective oxidation of alkane is desirable owing to the great economic benefit of obtaining oxygen-containing intermediates for the production of chemicals and polymers by using saturated hydrocarbons which are cheap and easy to get. As a typical representative of a selective oxidation reaction with industrial relevance, the selective oxidation of cyclohexane has attracted extensive attention because its products of cyclohexane and cyclohexanone (commonly known as KA oil) are important intermediate products in the manufacture of nylon-6 and nylon-66 polymers.…”

Catalytic selective oxidation of aromatic amines to azoxy derivatives with an ultralow loading of peroxoniobate salts

“…27 Conversely, hydrogen peroxide is a benign oxidant considering that it generates H 2 O as the only by-product and it can be activated under much milder conditions, improving the safety of the oxidation process. 28,29 Up to now, much effort has recently been devoted to the catalytic oxidation of aromatic amines to azoxy compounds on heterogeneous catalysts with H 2 O 2 . In this aspect, Tibased materials are commonly used for converting aromatic amines into azoxy compounds by forming hydroperoxo species in the presence of H 2 O 2 with TOF values varying from 0.2 h −1 to 95 h −1 .…”

“…27 Conversely, hydrogen peroxide is a benign oxidant considering that it generates H 2 O as the only by-product and it can be activated under much milder conditions, improving the safety of the oxidation process. 28,29…”

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

“…18−21 In recent years, group V transition-metal catalysts have attracted immense attention in selective oxidation. 22,23 For example, the application of vanadium compounds in oxidation catalysis has been reported in many studies, including alkane oxidation, 24 alcohol oxidation, 25 olefin epoxidation, 26,27 lignin degradation by oxidation, etc. 28 The other two elements in group V metals, niobium and tantalum, are less investigated in oxidation catalysis.…”

“…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 . The other two elements in group V metals, niobium and tantalum, are less investigated in oxidation catalysis.…”