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.

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.

Characteristics of the Photocatalytic Oxidation of Methane into Methanol on V-Containing MCM-41 Catalysts

2008 ◽  
Vol 124 (1-2) ◽  
pp. 80-84 ◽  
Author(s):  
Yun Hu ◽  
Yasuhito Nagai ◽  
Diana Rahmawaty ◽  
Chaohai Wei ◽  
Masakazu Anpo
Keyword(s):  
Photocatalytic Oxidation ◽  
Oxidation Of Methane ◽  
Mcm 41

scholarly journals Efficient photocatalytic oxidation of methane over β-Ga2O3/activated carbon composites

RSC Advances ◽  
2017 ◽  
Vol 7 (60) ◽  
pp. 37508-37521 ◽  
Author(s):  
Jianping Wei ◽  
Juan Yang ◽  
Zhihui Wen ◽  
Jun Dai ◽  
Yao Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Photocatalytic Oxidation ◽  
Active Species ◽  
Carbon Composites ◽  
Oxidation Of Methane

Efficient photocatalytic oxidation of CH4 can be implemented over Ga2O3/AC composites, owing to the enhanced separation of photoinduced e−/h+ pairs and generation of active species.

Sunlight-Assisted Photocatalytic Oxidation of Methane over Uranyl-Anchored MCM-41

2004 ◽  
Vol 98 (2-3) ◽  
pp. 113-116 ◽  
Author(s):  
Vidya Krishna ◽  
Valmik S. Kamble ◽  
Parasuraman Selvam ◽  
Narendra M. Gupta
Keyword(s):  
Photocatalytic Oxidation ◽  
Oxidation Of Methane ◽  
Mcm 41

Photooxidation of Methane to Methanol by Perrhenate in Water under Ambient Conditions

2013 ◽  
Vol 68 (8) ◽  
pp. 891-894 ◽  
Author(s):  
Horst Kunkely ◽  
Arnd Vogler
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Oxygen Atom ◽  
Photocatalytic Oxidation ◽  
Atom Transfer ◽  
Ambient Conditions ◽  
Oxygen Atom Transfer ◽  
Oxidation Of Methane

The oxidation of methane to methanol takes place selectively by the photolysis of perrhenate in aqueous solution in the presence of methane. This photoreaction is formally an oxygen atom transfer. Because the reoxidation of the reduced perrhenate is accomplished with hydrogen peroxide the overall process can be viewed as photocatalytic oxidation of methane to methanol: CH4 + H2O2 → CH3OH+ H2O.

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