Selective oxidation of methane to methanol by NTP plasma: The effect of power and oxygen on conversion and selectivity

Fathollahi, Parisa; Farahani, Mina; Rad, Rezvan Hosseini; Khani, Mohammad Reza; Asadi, Afshin; Shafiei, Mojtaba; Shokri, Babak

doi:10.1016/j.elstat.2021.103594

Cited by 11 publications

(4 citation statements)

References 68 publications

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“…Even for empty reactors, DBD systems have narrow annular reaction volumes with high surface-to-volume ratios and surface/reactor wall effects are likely to be significant in all cases (especially at ambient pressure). Indeed, an impressive 27.5% methanol yield (36.2% selectivity at 76% CH 4 conversion) recently reported in an empty reactor is partly attributed to the oxidized copper electrode surface, as well as optimization of other reaction and discharge parameters . The electrical power input in this case was equivalent to ∼0.95 kWh mol –1 methanol.…”

Section: Background Chemistrymentioning

confidence: 70%

“…Indeed, an impressive 27.5% methanol yield (36.2% selectivity at 76% CH 4 conversion) recently reported in an empty reactor is partly attributed to the oxidized copper electrode surface, as well as optimization of other reaction and discharge parameters. 52 The electrical power input in this case was equivalent to ∼0.95 kWh mol −1 methanol. A number of studies have reported increased methane conversions when reactor volumes are filled with solid "catalysts", and although these increases are generally modest, they represent a large increase in reaction rate given the reactor volume occluded by the catalysts and correspondingly large reductions in residence times.…”

Section: High Pressure Moderate Temperaturementioning

confidence: 99%

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Methane Oxidation to Methanol

et al. 2022

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The direct transformation of methane to methanol remains a significant challenge for operation at a larger scale. Central to this challenge is the low reactivity of methane at conditions that can facilitate product recovery. This review discusses the issue through examination of several promising routes to methanol and an evaluation of performance targets that are required to develop the process at scale. We explore the methods currently used, the emergence of active heterogeneous catalysts and their design and reaction mechanisms and provide a critical perspective on future operation. Initial experiments are discussed where identification of gas phase radical chemistry limited further development by this approach. Subsequently, a new class of catalytic materials based on natural systems such as iron or copper containing zeolites were explored at milder conditions. The key issues of these technologies are low methane conversion and often significant overoxidation of products. Despite this, interest remains high in this reaction and the wider appeal of an effective route to key products from C–H activation, particularly with the need to transition to net carbon zero with new routes from renewable methane sources is exciting.

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Section: Background Chemistrymentioning

confidence: 70%

Section: High Pressure Moderate Temperaturementioning

confidence: 99%

Methane Oxidation to Methanol

et al. 2022

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“…Over the last few decades, significant effort has been made to convert methane and other light hydrocarbons with the assistance of NTP, including methane reforming to produce syngas, 19,20 partial oxidation of methane for methanol production, 21,22 and non-oxidative activation of methane to higher hydrocarbons. [23][24][25][26][27][28][29][30] Unfortunately, to our best knowledge, the majority of studies focused on the production of C 2 hydrocarbons, while the directly nonoxidative methane liquefaction has not been well-studied.…”

Section: Introductionmentioning

confidence: 99%

Non-thermal plasma assisted non-oxidative methane liquefaction for fuel production at near ambient conditions

Meng

Song

2023

Catal. Sci. Technol.

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“…Fathollahi et al reported that increasing the oxygen flow rate in the DBD reactor with an inner Cu electrode led to the formation of OH radicals that increased methane conversion and methanol selectivity[64]. They noticed that when the plasma power was increased from 10W to 152W, the electric field inside the reactor rose, creating electrons with sufficient energy to break the C−H bond (8.8 eV) and O−O bond (5.1 eV).…”

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Recent Progress on the Direct Conversion of Methane to Methanol

Edor

2024

Preprint

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Methanol is a valuable industrial chemical that serves as a clean fuel and a precursor to many high-demand chemicals like acetic acid, methyl tertiary butyl ether, dimethyl ether, formaldehyde, methyl halides, and methylamine, among others. Methane on the other hand is an abundant gas that constitutes about 85-96 %wt of natural gas compositions obtained from the cracking of petroleum or as a byproduct of coalification or biomass fermentation process. It is reportedly the second most abundant greenhouse gas emitted into the atmosphere after CO2 and also has 25 times as much greenhouse effect as CO2. Therefore, the conversion of methane to methanol is a transformative approach to creating fuels and important chemical feedstocks and intermediates and also a sustainable way to reduce the emission of greenhouse gases and mitigate global warming. Currently, methanol is manufactured industrially at a commercial scale from methane via the indirect energy-intensive syngas/FTS route which is expensive and environmentally unfriendly and proceeds at high temperatures and pressures. Therefore, direct conversion of methane to methanol is desirable to replace the indirect syngas/FTS with the possible advantages of reduced energy consumption, simplified process routes, and potentially higher selectivity and yield. This mini-review explores the recent advancement in the different direct-methane-to-methanol conversion methods, challenges, and opportunities.

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Selective oxidation of methane to methanol by NTP plasma: The effect of power and oxygen on conversion and selectivity

Cited by 11 publications

References 68 publications

Methane Oxidation to Methanol

Methane Oxidation to Methanol

Non-thermal plasma assisted non-oxidative methane liquefaction for fuel production at near ambient conditions

Recent Progress on the Direct Conversion of Methane to Methanol

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