Solar-Energy-Mediated Methane Conversion

Song, Hui; Meng, Xianguang; Wang, Zhou‐jun; Liu, Huimin

doi:10.1016/j.joule.2019.06.023

Cited by 316 publications

(260 citation statements)

References 149 publications

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“…Given that some reactions in Table S2 were non-oxidative coupling of methane, their yields were relatively low owing to the high thermodynamic barriers. [20] The yield of C 2 products over our optimised sample was also higher than for the partial oxidation of methane. Furthermore, the selectivity towards C 2 products of 60 % was comparable to that of traditional catalysts (e.g.…”

Section: Angewandte Chemiementioning

confidence: 76%

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

et al. 2020

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Oxidative coupling of methane (OCM) is considered one of the most promising catalytic technologies to upgrade methane. However, C 2 products (C 2 H 6 /C 2 H 4) from conventional methane conversion have not been produced commercially owing to competition from overoxidation and carbon accumulation at high temperatures. Herein, we report the codeposition of Pt nanoparticles and CuO x clusters on TiO 2 (PC-50) and use of the resulting photocatalyst for OCM in a flow reactor operated at room temperature under atmospheric pressure for the first time. The optimized Cu 0.1 Pt 0.5 /PC-50 sample showed a highest yield of C 2 product of 6.8 mmol h À1 at a space velocity of 2400 h À1 , more than twice the sum of the activity of Pt/PC-50 (1.07 mmol h À1) and Cu/PC-50 (1.9 mmol h À1), it might also be the highest among photocatalytic methane conversions reported so far under atmospheric pressure. A high C 2 selectivity of 60 % is also comparable to that attainable by conventional high-temperature (> 943 K) thermal catalysis. It is proposed that Pt functions as an electron acceptor to facilitate charge separation, while holes could transfer to CuO x to avoid deep dehydrogenation and the overoxidation of C 2 products.

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Section: Angewandte Chemiementioning

confidence: 76%

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

et al. 2020

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“…With the continuous growth in the world population and significant improvement in the living standards of human beings, energy consumption has soared in the last decades, especially in the non‐OECD countries (Figure a) . To date, 85 % of primary energy is derived from fossil fuels, including oil, coal, and natural gas, which points to severe energy shortages in the near future .…”

Section: Introductionmentioning

confidence: 99%

Coupling of Solar Energy and Thermal Energy for Carbon Dioxide Reduction: Status and Prospects

2020

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Enormous efforts have been devoted to the reduction of carbon dioxide (CO2) by utilizing various driving forces, such as heat, electricity, and radiation. However, the efficient reduction of CO2 is still challenging because of sluggish kinetics. Recent pioneering studies from several groups, including us, have demonstrated that the coupling of solar energy and thermal energy offers a novel and promising strategy to promote the activity and/or manipulate selectivity in CO2 reduction. Herein, we clarify the definition and principles of coupling solar energy and thermal energy, and comprehensively review the status and prospects of CO2 reduction by coupling solar energy and thermal energy. Catalyst design, reactor configuration, photo‐mediated activity/selectivity, and mechanism studies in photo‐thermo CO2 reduction will be emphasized. The aim of this Review is to promote understanding towards CO2 activation and provide guidelines for the design of new catalysts for the efficient reduction of CO2.

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“…They involve methane steam reforming, partial oxidation, autothermal reforming or Andrussow reaction [11][12][13] . The non-commercial routes for methane conversion can be divided into oxidative and non-oxidative ones [8][9][10][11][12][13][14][15][16][17][18][19][20][21] . The non-oxidative routes, such as methane aromatization, result in significant carbon deposition, while the oxidative routes, such as methane thermocatalytic coupling and methane partial oxidation, usually suffer from insufficient selectivity and abundant production of CO2.…”

mentioning

confidence: 99%

Stoichiometric methane conversion to ethane using photochemical looping at ambient temperature

et al. 2020

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Methane activation and utilization are among the major challenges of modern science. Methane is potentially an important feedstock for manufacturing value-added fuels and chemicals. However, most of known processes require excessive operating temperatures and exhibit insufficient selectivity. Here, we demonstrate a photochemical looping strategy for highly selective stoichiometric conversion of methane to ethane at ambient temperature over silverheteropolyacid-titania nanocomposites. The process involves stoichiometric reaction of methane with highly-dispersed cationic silver under illumination, which results in the formation of methyl radicals. Recombination of the generated methyl radicals leads to selective, and almost quantitative, formation of ethane. Cationic silver species are simultaneously reduced to metallic silver. The silver-heteropolyacid-titania nanocomposites can be reversibly regenerated in air under illumination at ambient temperature. The photochemical looping process achieves methane coupling selectivity over 90%, quantitative yield of ethane over 9%, high quantum efficiency (3.5% at 362 nm) and excellent stability.

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Solar-Energy-Mediated Methane Conversion

Cited by 316 publications

References 149 publications

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

Coupling of Solar Energy and Thermal Energy for Carbon Dioxide Reduction: Status and Prospects

Stoichiometric methane conversion to ethane using photochemical looping at ambient temperature

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Solar-Energy-Mediated Methane Conversion

Cited by 316 publications

References 149 publications

Platinum‐ and CuOx‐Decorated TiO2 Photocatalyst for Oxidative Coupling of Methane to C2 Hydrocarbons in a Flow Reactor

Platinum‐ and CuOx‐Decorated TiO2 Photocatalyst for Oxidative Coupling of Methane to C2 Hydrocarbons in a Flow Reactor

Coupling of Solar Energy and Thermal Energy for Carbon Dioxide Reduction: Status and Prospects

Stoichiometric methane conversion to ethane using photochemical looping at ambient temperature

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Product

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Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor