Controllable synthesis of mesoporous cobalt oxide for peroxide free catalytic epoxidation of alkenes under aerobic conditions

Weerakkody, Chandima; Biswas, Sourav; Song, Wenqiao; He, Jian; Wasalathanthri, Niluka D.; Dissanayake, Shanka; Kriz, David A.; Dutta, Biswanath; Suib, Steven L.

doi:10.1016/j.apcatb.2017.09.053

Cited by 64 publications

(45 citation statements)

References 70 publications

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“…will exalt the catalytic activity as well [30]. Many stable materials have been used as supports, such as polymers [31], metal organic frameworks (MOFs) [32], carbon materials [33], porous silica materials [34] etc. Introducing active sites with diverse protocols on proper supports is a common and valid strategy of preparing heterogeneous catalysts.…”

Section: Heterogeneous Molybdenum-based Catalystsmentioning

confidence: 99%

Recent Progress in Application of Molybdenum-Based Catalysts for Epoxidation of Alkenes

et al. 2019

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Epoxides are important industrial intermediates applied in a variety of industrial processes. During the production of epoxides, catalysts have played an irreplaceable and unique role. In this review, the historic progress of molybdenum-based catalysts in alkene epoxidation are covered and an outlook on future challenge discussed. Efficient catalysts are demonstrated including soluble molybdenum complexes, polyoxometalates catalysts, molybdenum-containing metal organic frameworks, silica supported molybdenum-based catalysts, polymer supported molybdenum-based catalysts, magnetic molybdenum-based catalysts, hierarchical molybdenum-based catalysts, graphene-based molybdenum containing catalysts, photocatalyzed epoxidation catalysts, and some other systems. The effects of different solvents and oxidants are discussed and the mechanisms of epoxidation are summarized. The challenges and perspectives to further enhance the catalytic performances in alkenes epoxidation are presented.

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Section: Heterogeneous Molybdenum-based Catalystsmentioning

confidence: 99%

Recent Progress in Application of Molybdenum-Based Catalysts for Epoxidation of Alkenes

et al. 2019

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“…Co 3 O 4 has emerged as an interesting catalytic material and has gained much attention due to superior oxygen storage/release and redox properties due to the multivalent nature . Mesoporous materials possess high surface areas and large pore volumes, which provide more accessible active sites and facilitate diffusion of reactants and products, for efficient and enhanced catalytic performance compared to their non porous counterparts ,…”

Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Properties of Molybdenum Promoted Mesoporous Cobalt Oxide: Structure‐Surface‐Dependent Activity for Selective Synthesis of 2‐Substituted Benzimidazoles

Weerakkody

Rathnayake

et al. 2018

ChemCatChem

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High‐valent molybdenum ions were substituted into the cobalt oxide lattice through a one step, sol‐gel method and investigated for selective synthesis of 2‐substituted benzimidazoles. Catalyst synthesis involves surfactant assisted soft templating inverse micelle method, which forms mesopores by interconnected intraparticle voids. Substitutional doping of Mo6+ resulted in materials with modified structural, morphological, surface, and redox properties. The catalytic activity increased with Mo concentration until an optimum amount (3 % Mo incorporation). Modified material shows lattice expansion, increased surface oxygen vacancies, and high surface area, which are responsible for the higher catalytic activity in selective benzimidazole synthesis reaction. A strong correlation between surface properties of the catalyst and the product selectivity was observed and plausible mechanistic and kinetic data are proposed and collected, respectively.

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“…Supported cobalt oxide nanoparticles have previously been used for direct esterification . Mesoporous cobalt oxide has shown to be effective in oxidation reactions due to ease of reducibility of Co 3+ (E° red =+1.81), proton abstraction by Co 0 and Co 2+ sites, and high lattice oxygen content . We examined catalytic activity of mesoporous cobalt oxide material and compared this with manganese oxide.…”

Section: Resultsmentioning

confidence: 77%

“…Seeing the value in non‐precious metals catalysis for esterification of broad range of substrates, we sought a green chemistry approach by simplifying the reaction to aerobic conditions and mesoporous metal oxides. University of Connecticut synthesis (UCT) is a group of mesoporous materials synthesized by a surfactant assisted sol‐gel method of making mesoporous materials and has been shown to have broad applicability for catalysis . Here, we report the self‐esterification reaction enabled by aerobic heterogeneous UCT metal oxide catalysts mainly mesoporous manganese oxides (meso‐MnOx) and mesoporous cobalt oxides (meso‐CoOx).…”

Section: Introductionmentioning

confidence: 85%

Aerobic Self‐Esterification of Alcohols Assisted by Mesoporous Manganese and Cobalt Oxide

et al. 2019

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Aerobic self-esterification of primary alcohols catalyzed by mesoporous metal oxides (manganese and cobalt oxides) is reported under base and solvent free conditions. For a range of aliphatic alcohols, up to 90 % conversions to esters was achieved. The catalytic reaction is likewise applicable to neat aldehydes as substrates with yields of up to 86 %. High pressure batch reaction for ethanol to ethyl acetate led to 22 % yield. Isotope labeling studies indicated decarboxylation on the catalyst surface. Mechanistic and kinetic experiments implicate oxygen rebound and α-carbon removal as intermediate steps.Mesoporous cobalt oxide showed about 20 % higher catalytic activity compared to mesoporous manganese oxide.

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Controllable synthesis of mesoporous cobalt oxide for peroxide free catalytic epoxidation of alkenes under aerobic conditions

Cited by 64 publications

References 70 publications

Recent Progress in Application of Molybdenum-Based Catalysts for Epoxidation of Alkenes

Recent Progress in Application of Molybdenum-Based Catalysts for Epoxidation of Alkenes

Enhanced Catalytic Properties of Molybdenum Promoted Mesoporous Cobalt Oxide: Structure‐Surface‐Dependent Activity for Selective Synthesis of 2‐Substituted Benzimidazoles

Aerobic Self‐Esterification of Alcohols Assisted by Mesoporous Manganese and Cobalt Oxide

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