scholarly journals Direct Catalytic Conversion of CO2 to Cyclic Organic Carbonates under Mild Reaction Conditions by Metal—Organic Frameworks

Catalysts ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 34 ◽  
Author(s):  
Seong Huh
Keyword(s):  
Metal Organic Framework ◽  
Cycloaddition Reaction ◽  
Co2 Concentration ◽  
Reaction Conditions ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Electrochemical Conversion ◽  
Modern Chemical ◽  
Metal Organic ◽  
Carbon Dioxide Co2

The reduction of the representative greenhouse gas, carbon dioxide (CO2), is significantly an important theme for the current research in the modern chemical world. For the last two decades, the development of new metal-organic framework (MOF) systems with highly selective capture of CO2, in the presence of other competing gaseous molecules, has flourished to capture or separate CO2 for environmental protection. Nonetheless, the ultimate resolution to lessen the atmospheric CO2 concentration may be in the chemical or electrochemical conversion of CO2 to other compounds. In this context, the catalytic cycloaddition reaction of CO2 into organic epoxides to produce cyclic carbonates is a more attractive method. MOFs are being proven as efficient heterogeneous catalytic systems for this important reaction. In this review, we collected very recent progress in MOF-based catalytic systems, fully operable under very mild reaction conditions (room temperature and 1 atm CO2).

scholarly journals Recyclable Catalysts for Alkyne Functionalization

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3525
Author(s):  
Leslie Trigoura ◽  
Yalan Xing ◽  
Bhanu P. S. Chauhan
Keyword(s):  
Supported Catalysts ◽  
Metal Organic Framework ◽  
Metal Nanoparticle ◽  
Homogeneous Catalyst ◽  
Catalyst Recycling ◽  
Catalytic Systems ◽  
Recyclable Catalysts ◽  
Metal Organic ◽  
Porous Organic Framework ◽  
Organic Framework

In this review, we present an assessment of recent advances in alkyne functionalization reactions, classified according to different classes of recyclable catalysts. In this work, we have incorporated and reviewed the activity and selectivity of recyclable catalytic systems such as polysiloxane-encapsulated novel metal nanoparticle-based catalysts, silica–copper-supported nanocatalysts, graphitic carbon-supported nanocatalysts, metal organic framework (MOF) catalysts, porous organic framework (POP) catalysts, bio-material-supported catalysts, and metal/solvent free recyclable catalysts. In addition, several alkyne functionalization reactions have been elucidated to demonstrate the success and efficiency of recyclable catalysts. In addition, this review also provides the fundamental knowledge required for utilization of green catalysts, which can combine the advantageous features of both homogeneous (catalyst modulation) and heterogeneous (catalyst recycling) catalysis.

scholarly journals Selective Styrene Oxidation to Benzaldehyde over Recently Developed Heterogeneous Catalysts

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1680
Author(s):  
Marta A. Andrade ◽  
Luísa M. D. R. S. Martins
Keyword(s):  
Heterogeneous Catalysts ◽  
Carbon Materials ◽  
Oxygen Species ◽  
Styrene Oxidation ◽  
Reaction Conditions ◽  
Reactive Metal ◽  
Catalytic Systems ◽  
Tert Butyl Hydroperoxide ◽  
Metal Organic ◽  
Important Intermediate

The selective oxidation of styrene under heterogeneous catalyzed conditions delivers environmentally friendly paths for the production of benzaldehyde, an important intermediate for the synthesis of several products. The present review explores heterogeneous catalysts for styrene oxidation using a variety of metal catalysts over the last decade. The use of several classes of supports is discussed, including metal–organic frameworks, zeolites, carbon materials and silicas, among others. The studied catalytic systems propose as most used oxidants tert-butyl hydroperoxide, and hydrogen peroxide and mild reaction conditions. The reaction mechanism proceeds through the generation of an intermediate reactive metal–oxygen species by catalyst-oxidant interactions. Overall, most of the studies highlight the synergetic effects among the metal and support for the activity and selectivity enhancement.

scholarly journals En Route to a Heterogeneous Catalytic Direct Peptide Bond Formation by Zr-Based Metal–Organic Framework Catalysts

ACS Catalysis ◽  
2021 ◽  
pp. 7647-7658
Author(s):  
Francisco de Azambuja ◽  
Alexandra Loosen ◽  
Dragan Conic ◽  
Maxime van den Besselaar ◽  
Jeremy N. Harvey ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Bond Formation ◽  
Peptide Bond ◽  
Peptide Bond Formation ◽  
Heterogeneous Catalytic ◽  
Metal Organic ◽  
Organic Framework

scholarly journals Templated interfacial synthesis of metal-organic framework (MOF) nano- and micro-structures with precisely controlled shapes and sizes

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Lingyao Meng ◽  
Binyu Yu ◽  
Yang Qin
Keyword(s):  
Crystal Growth ◽  
Metal Organic Framework ◽  
Reaction Conditions ◽  
Zeolitic Imidazolate Framework ◽  
Crystallographic Preferred Orientation ◽  
Metal Organic ◽  
Interfacial Synthesis ◽  
Oil Water ◽  
Synthesis Methodology ◽  
Micro Structures

AbstractMetal-organic frameworks (MOF) are an emerging class of microporous materials with promising applications. MOF nanocrystals, and their assembled super-structures, can display unique properties and reactivities when compared with their bulk analogues. MOF nanostructures of 0-D, 2-D, and 3-D dimensions can be routinely obtained by controlling reaction conditions and ligand additives, while formation of 1-D MOF nanocrystals (nanowires and nanorods) and super-structures has been relatively rare. We report here a facile templated interfacial synthesis methodology for the preparation of a series of 1-D MOF nano- and micro-structures with precisely controlled shapes and sizes. Specifically, by applying track-etched polycarbonate (PCTE) membranes as the templates and at the oil/water interface, we rapidly and reproducibly synthesize zeolitic imidazolate framework-8 (ZIF-8) and ZIF-67 nano- and micro structures of sizes ranging from 10 nm to 20 μm. We also identify a size confinement effect on MOF crystal growth, which leads to single crystals under the most restricted conditions and inter-grown polycrystals at larger template pore sizes, as well as surface directing effects that influence the crystallographic preferred orientation. Our findings provide a potentially generalizable method for controlling the size, morphology, and crystal orientations of MOF nanomaterials, as well as offering fundamental understanding into MOF crystal growth mechanisms.

scholarly journals Green Pathway in Utilizing CO2 via Cycloaddition Reaction with Epoxide—A Mini Review

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 548 ◽  
Author(s):  
Kunlanan Kiatkittipong ◽  
Muhammad Amirul Amin Mohamad Shukri ◽  
Worapon Kiatkittipong ◽  
Jun Wei Lim ◽  
Pau Loke Show ◽  
...  
Keyword(s):  
Supported Catalysts ◽  
Metal Organic Framework ◽  
Sustainable Use ◽  
Cycloaddition Reaction ◽  
Cyclic Carbonate ◽  
Organic Salt ◽  
Catalytic Systems ◽  
Carbonate Production ◽  
Use Of Resources ◽  
Salen Complexes

Carbon dioxide (CO2) has been anticipated as an ideal carbon building block for organic synthesis due to the noble properties of CO2, which are abundant renewable carbon feedstock, non-toxic nature, and contributing to a more sustainable use of resources. Several green and proficient routes have been established for chemical CO2 fixation. Among the prominent routes, this review epitomizes the reactions involving cycloaddition of epoxides with CO2 in producing cyclic carbonate. Cyclic carbonate has been widely used as a polar aprotic solvent, as an electrolyte in Li-ion batteries, and as precursors for various forms of chemical synthesis such as polycarbonates and polyurethanes. This review provides an overview in terms of the reaction mechanistic pathway and recent advances in the development of several classes of catalysts, including homogeneous organocatalysts (e.g., organic salt, ionic liquid, deep eutectic solvents), organometallic (e.g., mono-, bi-, and tri-metal salen complexes and non-salen complexes) and heterogeneous supported catalysts, and metal organic framework (MOF). Selection of effective catalysts for various epoxide substrates is very important in determining the cycloaddition operating condition. Under their catalytic systems, all classes of these catalysts, with regard to recent developments, can exhibit CO2 cycloaddition of terminal epoxide substrates at ambient temperatures and low CO2 pressure. Although highly desired conversion can be achieved for internal epoxide substrates, higher temperature and pressure are normally required. This includes fatty acid-derived terminal epoxides for oleochemical carbonate production. The production of fully renewable resources by employment of bio-based epoxy with biorefinery concept and potential enhancement of cycloaddition reactions are pointed out as well.

Stabilization of Cu2O nanoparticles on a 2D metal–organic framework for catalytic Huisgen 1,3-dipolar cycloaddition reaction

2015 ◽  
Vol 44 (1) ◽  
pp. 83-86 ◽  
Author(s):  
Kolleboyina Jayaramulu ◽  
Venkata M. Suresh ◽  
Tapas Kumar Maji
Keyword(s):  
Metal Organic Framework ◽  
Cycloaddition Reaction ◽  
Porous Matrix ◽  
Dipolar Cycloaddition ◽  
Metal Organic ◽  
Cu2o Nanoparticles ◽  
Organic Framework

A 2D porous matrix with stabilized Cu2O NPs (Cu2O@MOF) has been studied for use in the catalytic 1,3-dipolar Huisgen cycloaddition reaction for the preparation of 1,2,3-triazoles.

scholarly journals Adsorption of Carbon Dioxide, Methane, and Nitrogen on Zn(dcpa) Metal-Organic Framework

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5598
Author(s):  
Rui P. P. L. Ribeiro ◽  
Isabel A. A. C. Esteves ◽  
José P. B. Mota
Keyword(s):  
Carbon Dioxide ◽  
Metal Organic Framework ◽  
Energy Difference ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
Metastable Structures ◽  
Metal Organic ◽  
Pressure Swing ◽  
Adsorption Of Co2 ◽  
Carbon Dioxide Co2

Adsorption-based processes using metal-organic frameworks (MOFs) are a promising option for carbon dioxide (CO2) capture from flue gases and biogas upgrading to biomethane. Here, the adsorption of CO2, methane (CH4), and nitrogen (N2) on Zn(dcpa) MOF (dcpa (2,6-dichlorophenylacetate)) is reported. The characterization of the MOF by powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), and N2 physisorption at 77 K shows that it is stable up to 650 K, and confirms previous observations suggesting framework flexibility upon exposure to guest molecules. The adsorption equilibrium isotherms of the pure components (CO2, CH4, and N2), measured at 273–323 K, and up to 35 bar, are Langmuirian, except for that of CO2 at 273 K, which exhibits a stepwise shape with hysteresis. The latter is accurately interpreted in terms of the osmotic thermodynamic theory, with further refinement by assuming that the free energy difference between the two metastable structures of Zn(dcpa) is a normally distributed variable due to the existence of different crystal sizes and defects in a real sample. The ideal selectivities of the equimolar mixtures of CO2/N2 and CO2/CH4 at 1 bar and 303 K are 12.8 and 2.9, respectively, which are large enough for Zn(dcpa) to be usable in pressure swing adsorption.

Fast Cyclohexane Oxidation Under Mild Reaction Conditions Through a Controlled Creation of Redox‐Active Fe(II/III) Sites in a Metal−Organic Framework

ChemCatChem ◽  
2019 ◽  
Vol 11 (22) ◽  
pp. 5650-5656 ◽  
Author(s):  
Ah‐Reum Kim ◽  
Sol Ahn ◽  
Tae‐Ung Yoon ◽  
Justin M. Notestein ◽  
Omar K. Farha ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Cyclohexane Oxidation ◽  
Reaction Conditions ◽  
Redox Active ◽  
Metal Organic ◽  
Organic Framework
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