Converting natural gas: quantum-sized bismuth vanadate holds the key for selective photocatalytic oxidation of methane

2021 ◽  
Author(s):  
Lianzhou Wang
Keyword(s):  
Natural Gas ◽  
Photocatalytic Oxidation ◽  
Bismuth Vanadate ◽  
Oxidation Of Methane

scholarly journals Photocatalytic selective oxidation of methane by quantum sized bismuth vanadate

2020 ◽  
Author(s):  
Yingying Fan ◽  
Wencai Zhou ◽  
Xueying Qiu ◽  
Hongdong Li ◽  
Yuheng Jiang ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Photocatalytic Oxidation ◽  
High Selectivity ◽  
Radical Reaction ◽  
Bismuth Vanadate ◽  
Light Wavelength ◽  
Oxidation Of Methane ◽  
Water Solvent ◽  
Energy Reaction ◽  
Wavelength Light

Abstract Selective oxidation of methane to desirable C1 oxygenates has long been the major challenge in catalysis. Here we report photocatalytic oxidation of methane by using quantum-sized bismuth vanadate nanoparticles as catalyst and oxygen as mild oxidant. A high selectivity towards methanol (1.1 mmol g-1 yield and 96.6% selectivity) and formaldehyde (13.1 mmol g-1 yield and 86.7% selectivity) products is successfully realized by simply controlling the light wavelength, light energy, reaction time and the amount of water solvent. Comprehensive characterizations disclose that the radical reaction mechanism is responsible for this efficient photocatalytic methane conversion.

Selective photocatalytic oxidation of methane by quantum-sized bismuth vanadate

2021 ◽  
Author(s):  
Yingying Fan ◽  
Wencai Zhou ◽  
Xueying Qiu ◽  
Hongdong Li ◽  
Yuheng Jiang ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Bismuth Vanadate ◽  
Oxidation Of Methane

scholarly journals Catalytic Oxidation of Methane

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 944
Author(s):  
Anil C. Banerjee
Keyword(s):  
Power Generation ◽  
Natural Gas ◽  
Catalytic Oxidation ◽  
Energy Sources ◽  
Oxidation Of Methane

Methane (the major component of natural gas) is one of the main energy sources for gas-powered turbines for power generation, and transport vehicles [...]

Solar Photocatalytic Oxidation of Methane to Methanol with Water over RuOx/ZnO/CeO2 Nanorods

2021 ◽  
Author(s):  
Dan Yu ◽  
Yanyan Jia ◽  
Zhou Yang ◽  
Hongwen Zhang ◽  
Jiwu Zhao ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Oxidation Of Methane

scholarly journals Laboratory-scale photomineralisation of n-alkanes in aqueous solution, by photocatalytic membranes immobilising titanium dioxide

2005 ◽  
Vol 7 (2) ◽  
pp. 79-85 ◽  
Author(s):  
Ignazio Renato Bellobono ◽  
Franca Morazzoni ◽  
Riccardo Bianchi ◽  
Emilia Simona Mangone ◽  
Rodica Stanescu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Oxidation ◽  
Point Of View ◽  
Laboratory Scale ◽  
Kinetic Constants ◽  
Quantum Yields ◽  
Oxidation Of Methane ◽  
Oxygen Donor ◽  
Absorbed Power ◽  
Kinetics Of

Kinetics of photocatalytic oxidation of methane, ethane,n-heptane,n-decane, andn-dodecane, to yield intermediates, and photomineralisation of intermediates, to yield carbon dioxide and water, was studied in aqueous solution, by a laboratory-scale photoreactor and photocatalytic membranes immobilizing30±3wt.% ofTiO2, in the presence of stoichiometric hydrogen peroxide as oxygen donor. The whole volume of irradiated solution was4.000±0.005L, the ratio between this volume and the geometrical apparent surface of the irradiated side of the photocatalytic membrane was3.8±0.1cm, and the absorbed power 0.30W/cm (cylindrical geometry). A kinetic model was used, by which mineralisation of substrate toCO2was supposed to occur, by kinetic constantsk1, through one single intermediate, mediating the behaviour of all the numerous real intermediates formed in the path from the substrate toCO2(kinetic constants of formation of the latter beingk2). A competitive Langmuirian adsorption of both substrate and “intermediate” was also supposed to be operative, as expressed by apparent adsorption constantsk1andk2, possessing a, partly at least, kinetic significance. By Langmuir-Hinshelwood treatment of initial rate data, starting values of thekandKcouples were obtained, from which, by a set of differential equations, the final optimised parameters,k1andk1,k2andK2, were calculated, able fit the whole photomineralisation curve, and not only its initial segment, as the Langmuirian parameters do. The parameters of present work are critically compared with those obtained in two preceding set of studies relative ton-alkanoic acids and ton-alkanols. They are interpreted on the basis of a closer behaviour of hydrocarbons to alkanols, from the photocatalytic point of view, than to carboxylic acids are. Discussion of limiting effective quantum yields, and their comparison with maximum, theoretical values, are also carried out.

scholarly journals Direct Convertion Of Methane To Liquid Hydrocarbons Using HZSM-5 Zeolite Catalyst Loaded With Metal

REAKTOR ◽  
2017 ◽  
Vol 7 (1) ◽  
pp. 7
Author(s):  
D. D. Anggoro
Keyword(s):  
Natural Gas ◽  
Packed Bed ◽  
Direct Conversion ◽  
Single Step ◽  
Packed Bed Reactor ◽  
Impregnation Method ◽  
Liquid Hydrocarbons ◽  
Oxidation Of Methane ◽  
Conversion Of Methane ◽  
Main Component

Methane is the main component of natural gas and this research provides the platrorm on the potential of utilizing natural gas, found abundant in Indonesia, to form gasoline. The objectives of the research are to modify HZSM-5 zeolite with a series of transition metals (Cr, Mn, Co, Ni, Cu, and Pt) and Ga , and to evaluate the performances  of these catalyst  for the single step conversion of methane to gasoline. The oxidation of methane were carried out in a micro-packed bed reactor at atmoepheric pressure, temperature 800 0C, F/W = 10440 ml/g.hr and 9%vol O2. Metals were loaded into the HZSM-5 zeolite by the wetness incipient impregnation method. The characterization results indicated that the ionic metals (Mn+) occupy the H+ position of HZSM-5 and metal loaded HZSM-5. Ni- HZSM-5, Cu- HZSM-5 and Ga- HZSM-5 gave a high methane conversion and high gasoline selectivity. Among the catalyst samles tested, Cr- HZSM-5 showed the highest  Research Octane Number (RON=86). These  catalyst have the potential  to convert natural gas to C5+ liquid hydrocarbons provided the oxidation, dehydration and oligomerization function of the metals are in balance.Keywords : direct conversion, methane, liquid hydrocarbons, metal, HZSM-5

Study on the Photo-Electro-Catalytic Oxidation of Methane

2013 ◽  
Vol 864-867 ◽  
pp. 1421-1426
Author(s):  
Wen Yan Wu ◽  
Luo Chun Wang ◽  
Zhen Zhou ◽  
Ke Jia Liu ◽  
Xiao Hua Li ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Ambient Pressure ◽  
Kinetic Constant ◽  
Illumination Time ◽  
Oxidation Of Methane ◽  
Conversion Of Methane ◽  
Intermittent Illumination ◽  
Electro Catalytic Oxidation

Emission control of methane from landfills has received considerable attentions in recent years. Photo-electro-catalytic oxidation of methane was carried out at the mode of continuous electrolysis and intermittent illumination with TiO2-coated titanium mesh plate as pholocatalyst and electrode in combination with ionic liquid as electrolyte under UV light irradiation. The result showed that the rapid conversion of methane was achieved under ambient pressure and temperature through photocatalytic oxidation combining with electrolysis. Under the mode of intermittent illumination (on:off = 10 min : 10 min) and continuous electrolysis (II-CE), the highest oxidation rate of methane (280 mg/(m3min)) was obtained. Under fixed off time and total illumination time, the oxidation quantity of methane linearly increased with the intermittent frequency. Photo-electro-catalytic oxidation of methane can be described by the first-order kinetics, and the apparent kinetic constant increased with the intermittent frequency.

Methanol formation at high pressure by the catalyzed oxidation of natural gas and by the sensitized oxidation of methane

1990 ◽  
Vol 57 (1) ◽  
pp. 45-54 ◽  
Author(s):  
N.R. Hunter ◽  
H.D. Gesser ◽  
L.A. Morton ◽  
P.S. Yarlagadda ◽  
D.P.C. Fung
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Oxidation Of Methane ◽  
Methanol Formation ◽  
Catalyzed Oxidation
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