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

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

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.

Catalytic performance of vanadium incorporated MCM-41 catalysts for the partial oxidation of methane to formaldehyde

2006 ◽  
Vol 302 (1) ◽  
pp. 48-61 ◽  
Author(s):  
Guoan Du ◽  
Sangyun Lim ◽  
Yanhui Yang ◽  
Chuan Wang ◽  
Lisa Pfefferle ◽  
...  
Keyword(s):  
Partial Oxidation ◽  
Catalytic Performance ◽  
Partial Oxidation Of Methane ◽  
Oxidation Of Methane ◽  
Mcm 41

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.

Coordination structures of vanadium and iron in MCM-41 and the catalytic properties in partial oxidation of methane

2005 ◽  
Vol 77 (2-3) ◽  
pp. 223-234 ◽  
Author(s):  
Qinghong Zhang ◽  
Wei Yang ◽  
Xiaoxing Wang ◽  
Ye Wang ◽  
Tetsuya Shishido ◽  
...  
Keyword(s):  
Partial Oxidation ◽  
Catalytic Properties ◽  
Partial Oxidation Of Methane ◽  
Oxidation Of Methane ◽  
Mcm 41

Photocatalytic Oxidation of Hexanol over Titanium Dioxide Supported on Mesoporous Silica

2015 ◽  
Vol 1112 ◽  
pp. 176-179
Author(s):  
Nur Umisyuhada Mohd Nor ◽  
Hendrik O. Lintang ◽  
Salasiah Endud ◽  
Leny Yuliati
Keyword(s):  
Photocatalytic Activity ◽  
Mesoporous Silica ◽  
Photocatalytic Oxidation ◽  
Sol Gel ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
Diffraction Peaks ◽  
Loading Amount ◽  
Xrd Patterns ◽  
Mcm 41

In order to improve the efficiency of TiO2, material with large surface area such as mesoporous silica is usually used as a support. In this study, the TiO2 was dispersed on mesoporous silica, MCM-41 by an impregnation method, meanwhile the bulk TiO2 was prepared by sol gel method. The X-ray diffraction (XRD) patterns showed that the intensities of diffraction peaks for MCM-41 decreased with the increase of the TiO2 loading, suggesting that the higher loading amount of TiO2 might lead to less ordered structure of MCM-41. The successful addition of TiO2 on MCM-41 was also confirmed from the fluorescence spectra, which the emission intensities of TiO2 and MCM-41 increased and decreased, respectively, with the increase of TiO2 loading on the MCM-41. The activities were compared between the bulk and dispersed TiO2 for photocatalytic oxidation of hexanol. Both bulk and dispersed TiO2 on MCM-41 showed good photocatalytic activity, while the MCM-41 did not show photocatalytic activity. Since the efficiency of photocatalyst can be defined by its respective turnover number (TON), the comparison between bulk and dispersed TiO2 on MCM-41 was made based on their TON values. It was revealed that the dispersed TiO2 on the MCM-41 with 5 wt% of TiO2 loading was the most efficient photocatalyst among all the samples.

Sign in / Sign up

Export Citation Format

Share Document