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Society is currently confronted with the continuing environmental problems of global warming and ocean acidification related to increasing CO2 emission from anthropogenic sources. These environmental issues are also connected to the inevitable energy supply shortage due to the eventual depletion of fossil fuel sources. As a solution, the technology of recycling CO2 into useful organic materials continues to attract attention. This methodology can be categorized into two main parts: CO2 fixation and CO2 reduction. For both reactions, molecular catalysts based on transition metal coordination complexes and organometallic compounds have been developed and examined. Molecular catalysts can be characterized and iteratively improved at the molecular level through spectroscopic experiments and the isolation of intermediate species, which is particularly advantageous in comparison to heterogeneous catalysts. The fixation of CO2 into organic compounds to form a carbon-carbon bond by using organometallic catalysts is a direct methodology for CO2 utilization and represents the potential reversible storage of electrochemical energy in chemical bonds. The resultant carboxylic acid-containing compounds formed as the initial products can be subsequently converted into other organic materials, even products with new chiral centers. The reduction of CO2 by two electrons (often with a proton donor as a co-substrate) yields carbon monoxide (CO) and formic acid (HCOOH), which can be further converted to useful chemicals. Reduction reactions involving more than two electrons and two protons can produce formaldehyde (HCHO), methanol (CH3OH), and methane (CH4), which are also desirable as chemicals and fuels. For molecular electrocatalysts, more negative potentials than the equilibrium ones for CO2 reduction are generally required; the difficulty is that the equilibrium potentials for CO2 reduction are generally negative of the equilibrium potential for proton reduction to produce H2, representing a competing thermodynamically favored process. A complementary approach to an electrochemical one is to mediate CO2 reduction with photo-induced electron transfer reactions. Photo- and electrocatalytic CO2 reduction can be used to achieve artificial photosynthesis, or the production of commodity chemicals and fuels with renewable energy inputs originating from solar sources. This Research Topic covers the molecular catalysts based on coordination and organometallic compounds for CO2 fixation/reduction. It includes chemical, electrochemical, and photochemical reactions. It also covers systematic studies of reaction mechanisms and the spectroscopic characterization of catalytic intermediates. Molecular catalysts for CO2 fixation/reduction used as co-catalysts with heterogeneous catalytic systems are also included. Non-precious and abundant transition metal catalysts for CO2 fixation/reduction are important for future industrial applications as core components of the next generation of energy technologies.

Science: general issues --- CO2 reduction --- CO2 fixation --- electrocatalysis --- photocatalysis --- artificial photosynthesis --- CO2 reduction --- CO2 fixation --- electrocatalysis --- photocatalysis --- artificial photosynthesis

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Metal organic frameworks (MOFs) are a class of porous materials with a modular structure. This allows for very wide structural diversity and the possibility of synthesizing materials with tailored properties for advanced applications. Thus, MOF materials are the subject of intense research, with strong relevance to both science and technology. MOFs are formed by the assembly of two components: cluster or metal ion nodes, which are also called secondary building units (SBUs), and organic linkers between the SBUs, usually giving rise to crystalline structures with an open framework and significant porous texture development. The main aim of this Special Issue of Catalysts (ISSN 2073-4344) is to present the most relevant and recent insights in the field of the synthesis and characterization of MOFs and MOF-based materials for advanced applications, including adsorption, gas storage/capture, drug delivery, catalysis, photocatalysis, and/or chemical sensing.

Technology: general issues --- History of engineering & technology --- Materials science --- Metal–organic framework --- Lewis acid --- fructose --- 5-hydroxymethyl furfural --- biomass --- Metal-organic frameworks (MOFs) --- photocatalysis --- carbon dioxide reduction --- renewable energy --- heterogeneous catalysis --- metal organic framework --- surface modification --- Zinc glutarate --- CO2 fixation --- polycarbonate --- Mn-MOF-74 --- modification --- water resistance --- NH3-SCR performance --- environmental pollution --- filter --- gas sorption --- sensor --- hydrogen storage --- electrospinning --- one-pot hydrothermal --- immobilizing recombinant --- His-hCA II --- Ni-BTC nanorods --- metal–organic frameworks --- polyoxometalates --- hybrid materials --- synthesis --- catalysis --- heterogeneous catalyst --- aerobic oxidation --- cyclohexene --- metal organic frameworks --- NH2-MIL-125(Ti) --- water stability --- purification --- layered coordination polymer --- oxidative desulfurization --- denitrogenation extraction --- hydrogen peroxide --- lanthanides --- MOF --- catalyst --- microreactor --- kinetic studies --- metal organic frame works --- CO2 adsorption --- pre combustion --- gas membrane separation --- metal halide perovskites --- metal-organic framework --- fuel cell --- oxygen reduction reaction (ORR) --- metal organic frameworks (MOFs) --- hydrothermal synthesis --- coordination polymers --- crystal structures --- metal-organic frameworks --- carboxylate ligands --- olefin paraffin separations --- propyne --- propylene --- adsorption isotherms --- dynamic breakthrough --- n/a --- Metal-organic framework

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• Reference Manager
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Metal organic frameworks (MOFs) are a class of porous materials with a modular structure. This allows for very wide structural diversity and the possibility of synthesizing materials with tailored properties for advanced applications. Thus, MOF materials are the subject of intense research, with strong relevance to both science and technology. MOFs are formed by the assembly of two components: cluster or metal ion nodes, which are also called secondary building units (SBUs), and organic linkers between the SBUs, usually giving rise to crystalline structures with an open framework and significant porous texture development. The main aim of this Special Issue of Catalysts (ISSN 2073-4344) is to present the most relevant and recent insights in the field of the synthesis and characterization of MOFs and MOF-based materials for advanced applications, including adsorption, gas storage/capture, drug delivery, catalysis, photocatalysis, and/or chemical sensing.

Technology: general issues --- History of engineering & technology --- Materials science --- Metal-organic framework --- Lewis acid --- fructose --- 5-hydroxymethyl furfural --- biomass --- Metal-organic frameworks (MOFs) --- photocatalysis --- carbon dioxide reduction --- renewable energy --- heterogeneous catalysis --- metal organic framework --- surface modification --- Zinc glutarate --- CO2 fixation --- polycarbonate --- Mn-MOF-74 --- modification --- water resistance --- NH3-SCR performance --- environmental pollution --- filter --- gas sorption --- sensor --- hydrogen storage --- electrospinning --- one-pot hydrothermal --- immobilizing recombinant --- His-hCA II --- Ni-BTC nanorods --- metal-organic frameworks --- polyoxometalates --- hybrid materials --- synthesis --- catalysis --- heterogeneous catalyst --- aerobic oxidation --- cyclohexene --- metal organic frameworks --- NH2-MIL-125(Ti) --- water stability --- purification --- layered coordination polymer --- oxidative desulfurization --- denitrogenation extraction --- hydrogen peroxide --- lanthanides --- MOF --- catalyst --- microreactor --- kinetic studies --- metal organic frame works --- CO2 adsorption --- pre combustion --- gas membrane separation --- metal halide perovskites --- metal-organic framework --- fuel cell --- oxygen reduction reaction (ORR) --- metal organic frameworks (MOFs) --- hydrothermal synthesis --- coordination polymers --- crystal structures --- metal-organic frameworks --- carboxylate ligands --- olefin paraffin separations --- propyne --- propylene --- adsorption isotherms --- dynamic breakthrough --- Metal-organic framework --- Lewis acid --- fructose --- 5-hydroxymethyl furfural --- biomass --- Metal-organic frameworks (MOFs) --- photocatalysis --- carbon dioxide reduction --- renewable energy --- heterogeneous catalysis --- metal organic framework --- surface modification --- Zinc glutarate --- CO2 fixation --- polycarbonate --- Mn-MOF-74 --- modification --- water resistance --- NH3-SCR performance --- environmental pollution --- filter --- gas sorption --- sensor --- hydrogen storage --- electrospinning --- one-pot hydrothermal --- immobilizing recombinant --- His-hCA II --- Ni-BTC nanorods --- metal-organic frameworks --- polyoxometalates --- hybrid materials --- synthesis --- catalysis --- heterogeneous catalyst --- aerobic oxidation --- cyclohexene --- metal organic frameworks --- NH2-MIL-125(Ti) --- water stability --- purification --- layered coordination polymer --- oxidative desulfurization --- denitrogenation extraction --- hydrogen peroxide --- lanthanides --- MOF --- catalyst --- microreactor --- kinetic studies --- metal organic frame works --- CO2 adsorption --- pre combustion --- gas membrane separation --- metal halide perovskites --- metal-organic framework --- fuel cell --- oxygen reduction reaction (ORR) --- metal organic frameworks (MOFs) --- hydrothermal synthesis --- coordination polymers --- crystal structures --- metal-organic frameworks --- carboxylate ligands --- olefin paraffin separations --- propyne --- propylene --- adsorption isotherms --- dynamic breakthrough