Photocatalytic conversion of methane

Yuliati, Leny; Yoshida, Hisao

doi:10.1039/b710575b

Cited by 333 publications

(282 citation statements)

References 38 publications

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“…Although operating according to slightly different mechanisms they are both based on the generation of charge-separation [115][116][117]. Photochemistry applications in selective organic syntheses were exhaustively reviewed by Hoffmann, describing the high potential for photocatalytic oxidations under solar irradiation, using various sensitizing agents [118].…”

Section: Activation Mechanismmentioning

confidence: 99%

Selective Oxidation Catalysis: Opportunities and Challenges

et al. 2009

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This contribution discusses some aspects crucial for designing optimal and sustainable oxidation processes. The catalyst, although at the heart of the system, is only one decisive design parameter amongst many others. Indeed, an interdisciplinary approach is required to improve existing processes, but also to rationally and systematically access opportunities for oxidation research on renewable feedstock compounds.

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Section: Activation Mechanismmentioning

confidence: 99%

Selective Oxidation Catalysis: Opportunities and Challenges

et al. 2009

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“…Due to the massive availability in natural gas and shale gas deposits, the catalytic conversion of methane is becoming one of the most attractive frontiers both in academia and industry recently [1][2][3][4][5][6]. Among the various potential routes, partial oxidation of methane (POM) to syngas has attracted special attention [7][8][9][10][11][12] because of its obvious advantages, such as mild heat release, lower energy consumption, short-contact time, high conversion and selectivity at relatively lower temperature, suitable H 2 /CO ratio for downstream Fischer-Tropsch synthesis and methanol synthesis.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ni(111) surface alloying by Pt on partial oxidation of methane to syngas: A DFT study

et al. 2014

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“…A promising approach to methane conversion is the direct non-oxidative coupling of methane (NOCM) to form ethane and hydrogen powered by photons [Equation (1)]. [15,16] 2 CH 4The produced ethane can in turn be conveniently converted to liquid fuels or ethene through metathesis and dehydrogenation, respectively. [17] Furthermore, this NOCM reaction is the best way to produce clean H 2 energy from fossil fuels because methane has the highest H/C ratio among all hydrocarbons.…”

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confidence: 99%

Efficient Sunlight‐Driven Dehydrogenative Coupling of Methane to Ethane over a Zn⁺‐Modified Zeolite

et al. 2011

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Effective conversion of methane to a mixture of more valuable hydrocarbons and hydrogen under mild conditions is a great scientific and practical challenge. [1][2][3][4][5][6][7] Up to date, the thermal routes for activation of the strong CÀH bond (104 kcal mol À1 ) in methane require high temperatures and multistep processes, and therefore they are energy-consuming and inefficient. [8,9] Compared to methods powered by thermal energy, [10][11][12][13][14] techniques that use photonic energy have substantial advantages, such as the capacity to minimize coking at room temperature. A promising approach to methane conversion is the direct non-oxidative coupling of methane (NOCM) to form ethane and hydrogen powered by photons [Equation (1)]. [15,16] 2 CH 4The produced ethane can in turn be conveniently converted to liquid fuels or ethene through metathesis and dehydrogenation, respectively. [17] Furthermore, this NOCM reaction is the best way to produce clean H 2 energy from fossil fuels because methane has the highest H/C ratio among all hydrocarbons. However, the methane conversion using photocatalysts previously reported for the NOCM reaction is very low (less than 4 % upon UV irradiation for 90 hours).[18] More importantly, the wavelength of the light used in the photocatalytic systems previously reported for NOCM needs to be shorter than 270 nm, which is beyond the region of the solar spectrum (wavelength l > 290 nm) reaching the surface of the Earth. To achieve a substantial yield and to exploit solar energy effectively, the development of photocatalytic systems with a distinctly higher activity, higher selectivity, and lower photon energy threshold is desired.Herein, we report a Zn + -modified ZSM-5 zeolite catalyst which exhibits superior photocatalytic activity for selective C À H activation of an alkane molecule and methane conversion both upon high-pressure irradiation of a mercury lamp and sunlight irradiation at room temperature. An optimized catalyst converts 24 % of methane upon irradiation for 8 hours by a high-pressure mercury lamp with a selectivity larger than 99 % for ethane and hydrogen products. Mechanistic studies suggest a two-stage photoexcitation process, which lowers the energy threshold (l < 390 nm) needed to power our photocatalytic system relative to that (l < 270 nm) required by previously reported systems.Interactions of zeolites with metal vapors are an effective approach for the preparation of metal-containing zeolites. [19,20] Using this approach, we have synthesized a zincmodified ZSM-5 catalyst with a Brunauer-Emmett-Teller (BET) surface area of 362 m 2 g À1 through a solid-vapor reaction between a dehydrated HZSM-5 zeolite (protonated ZSM-5 with a Si/Al ratio of the framework of 14.8) and metallic zinc vapor. During the reaction, the protons of the Brønsted acidic sites (OH groups bridging Al and Si atoms of the framework) in the zeolite are reduced by zinc atoms to form H 2 molecules (as detected by gas chromatography, GC), whereas the zinc atoms undergo two different oxidation r...

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Photocatalytic conversion of methane

Cited by 333 publications

References 38 publications

Selective Oxidation Catalysis: Opportunities and Challenges

Selective Oxidation Catalysis: Opportunities and Challenges

Effect of Ni(111) surface alloying by Pt on partial oxidation of methane to syngas: A DFT study

Efficient Sunlight‐Driven Dehydrogenative Coupling of Methane to Ethane over a Zn⁺‐Modified Zeolite

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Photocatalytic conversion of methane

Cited by 333 publications

References 38 publications

Selective Oxidation Catalysis: Opportunities and Challenges

Selective Oxidation Catalysis: Opportunities and Challenges

Effect of Ni(111) surface alloying by Pt on partial oxidation of methane to syngas: A DFT study

Efficient Sunlight‐Driven Dehydrogenative Coupling of Methane to Ethane over a Zn+‐Modified Zeolite

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Efficient Sunlight‐Driven Dehydrogenative Coupling of Methane to Ethane over a Zn⁺‐Modified Zeolite