Direct oxidation of methane to oxygenates over heteropolyanions

Benlounes, Ouarda; Mansouri, Sadia; Rabia, C.; Hocine, Smaïn

doi:10.1016/s1003-9953(08)60070-5

Cited by 32 publications

(20 citation statements)

References 19 publications

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“…Due to this restriction, namely the reduced degrees of freedom stemming from the scaling relations, there are many reactions that cannot be fully optimized and thus suer from inecient catalysis. There are also some important reactions that currently have no eective catalysts (e.g., the partial oxidation of methane to methanol [252,253,254,255] and the direct decomposition of NO x [256]). The need for an extra degree of freedom that can take us away from the constraints of the scaling relation is clear.…”

Section: Outlook and Conclusionmentioning

confidence: 99%

Ferroelectrics: A pathway to switchable surface chemistry and catalysis

2016

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It has been known for more than six decades that ferroelectricity can aect a material's surface physics and chemistry thereby potentially enhancing its catalytic properties. Ferroelectrics are a class of materials with a switchable electrical polarization that can aect surface stoichiometry and electronic structure and thus adsorption energies and modes; e.g., molecular versus dissociative. Therefore, ferroelectrics may be utilized to achieve switchable surface chemistry whereby surface properties are not xed but can be dynamically controlled by, for example, applying an external electric eld or modulating the temperature. Several important examples of applications of ferroelectric and polar materials in photocatalysis and heterogeneous catalysis are discussed. In photocatalysis, the polarization direction can control band bending at water/ferroelectric and ferroelectric/semiconductor interfaces, thereby facilitating charge separation and transfer to the electrolyte and enhancing photocatalytic activity. For gas-surface interactions, available results suggest that using ferroelectrics as supports for catalytically active transition metals and oxides is another way to enhance catalytic activity. Finally, the possibility of incorporating ferroelectric switching into the catalytic cycle itself is described. In this scenario, a dynamic collaboration of two polarization states can be used to drive reactions that have been historically challenging to achieve on surfaces with xed chemical properties (e.g., direct NO x decomposition and the selective partial oxidation of methane). These predictions show that dynamic modulation of the polarization can help overcome some of the fundamental limitations on catalytic activity imposed by the Sabatier principle.

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Section: Outlook and Conclusionmentioning

confidence: 99%

Ferroelectrics: A pathway to switchable surface chemistry and catalysis

2016

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“…6 Th e carbon conversion effi ciencies of methane to methanol oxidation using chemical processes are usually below 20-50%. [7][8][9][10][11] In contrast, bioconversion of methane to methanol shows higher carbon conversion effi ciency above 50% (Table 1). [12][13][14] Hwang et al have shown that the conversion effi ciency of methane to methanol using a methanotroph was up to 75 %.…”

Section: Methane Metabolism In Methanotrophs Aerobic Oxidation Pathwamentioning

confidence: 99%

Metabolic engineering of methanotrophs and its application to production of chemicals and biofuels from methane

Lee

Hur

Nguyen

et al. 2016

Biofuels Bioprod Bioref

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Methane‐assimilating bacteria, methanotrophs, can play an important role in producing various value‐added chemicals and biofuels from methane, which is considered a next‐generation carbon feedstock. The capability to engineer the metabolic pathway of methanotrophs is a key success factor for enhancing methane‐to‐product conversion efficiency. Recently, OMICS studies on several model methanotrophs have been conducted and provided strategies to engineer methanotrophs. Here, we present a review on the current progresses and future prospects of metabolic engineering of methanotrophs and its application to chemical and biofuel production from methane. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…Methane is chemically very stable owing to the presence of C-H bonds [5,18,50], which require 438.8 kJ/mol to break [40]. MMO efficiently converts methane to methanol in biological systems [37] by splitting molecular oxygen and incorporating one atom of oxygen into methane.…”

Section: Methane-to-methanol Bioconversion By Methane Monooxygenasementioning

confidence: 99%

Biocatalytic Conversion of Methane to Methanol as a Key Step for Development of Methane-Based Biorefineries

Hwang¹,

Lee²,

Choi³

et al. 2014

Journal of Microbiology and Biotechnology

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Methane is considered as a next-generation carbon feedstock owing to the vast reserves of natural and shale gas. Methane can be converted to methanol by various methods, which in turn can be used as a starting chemical for the production of value-added chemicals using existing chemical conversion processes. Methane monooxygenase is the key enzyme that catalyzes the addition of oxygen to methane. Methanotrophic bacteria can transform methane to methanol by inhibiting methanol dehydrogenase. In this paper, we review the recent progress made on the biocatalytic conversion of methane to methanol as a key step for methane-based refinery systems and discuss future prospects for this technology.

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Direct oxidation of methane to oxygenates over heteropolyanions

Cited by 32 publications

References 19 publications

Ferroelectrics: A pathway to switchable surface chemistry and catalysis

Ferroelectrics: A pathway to switchable surface chemistry and catalysis

Metabolic engineering of methanotrophs and its application to production of chemicals and biofuels from methane

Biocatalytic Conversion of Methane to Methanol as a Key Step for Development of Methane-Based Biorefineries

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