two new heterogenized epoxidation nanocatalysts based on molybdenum and tungsten compounds were prepared withcovalent grafting of mcm-41 with 3-aminoropropyl trimethoxysilane and subsequent reaction with diphenylphosphinobenzaldehyde and complexation with m (mo, w)o2(acac)2. x-ray diffraction and nitrogen sorption analyses revealed the preservation of the textural properties of the support as w...

Epoxidation of bio-derived plant oils is a sustainable route to manufacturing plasticizers, additives in lubricants, and other chemicals. The traditional synthetic approaches suffer from the employment corrosive mineral acid or expensive peroxides (e.g., H2O2). In this work, we report epoxidation using O2 as terminal oxidant catalyzed by Co-N-C/SiO2 single-atom catalyst. dispersion cobalt confi...

Cyclic carbonates are valuable chemicals for the chemical industry and thus, their efficient synthesis is essential. Commonly, cyclic carbonates are synthesised in a two-step process involving the epoxidation of an alkene and a subsequent carboxylation to the cyclic carbonate. To couple both steps into a direct oxidative carboxylation reaction would be desired from an economical view point sinc...

Biphasic catalytic olefin epoxidation systems consisting of oxodiperoxomolybdenum catalysts in 1-n-alkyl-3-methylimidazolium hexafluorophosphate ionic liquid (IL) media with aqueous hydrogen peroxide oxidant were optimised by tuning the molecular structure of the IL and employing N-heterocyclic donor base additives to inhibit hydrolysis and enhance the activity of the catalyst. The latter study...

Although chemical and enzymatic catalysts have been combined, reactions in which an organometallic catalyst and a metalloenzyme work cooperatively to create products, which cannot be generated with either catalyst alone or in comparable yields by sequential reactions of the two catalysts, have not been reported. Such reactions are challenging to achieve, in part because the milieu in which thes...

This paper describes a method, discovered and refined by parallel screening, for the epoxidation of alkenes. It uses hydrogen peroxide as the terminal oxidant, is promoted by catalytic amounts (1.0-0.1 mol %) of manganese(2+) salts, and must be performed using at least catalytic amounts of bicarbonate buffer. Peroxymonocarbonate, HCO(4)(-), forms in the reaction, but without manganese, minimal ...

In the epoxidation of ethylene to oxide using chemical looping, Ag is supported on strontium ferrite perovskite, where acts as catalyst while perovskite an oxygen carrier. This study explores how various carriers based affect looping epoxidation. The structure carrier was varied by incorporating different ratios two phases: cubic SrFeO3, and a layered Ruddlesden-Popper (RP) phase: Sr3Fe2O7. Max...

Silver–copper alloys have been proposed as catalysts for ethylene epoxidation due to their superior selectivity compared to pure silver, the predominant catalyst for this reaction. Under reaction conditions it has been previously shown that, rather than a two-dimensional (2D) Ag–Cu alloy, a thin copper oxide-like layer forms on top of silver, and several possible surface structures were identif...

Linseed oil is characterized by an elevated concentration of highly unsaturated fatty acids such as linolenic and linoleic acids. This work has the objective to evaluate effect high unsaturation linseed on reactivity selectivity epoxidation reaction. For this purpose, different kinetic experiments with performic acid, produced in situ, phosphoric acid catalyst, have been performed interpreted a...