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

Abstract

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.

Photocatalytic Conversion of Methane: Recent Advancements and Prospects

“…Nanostructured semiconductors with high specific surface areas are generally applied as the photocatalysts for the oxidation of CH 4 . [17][18][19][20][21] Adjusting the band gap of semiconductors by doping, defect engineering,and fabricating hybrid semiconductors is beneficial for expanding the spectral range of the absorption. [22][23][24][25][26][27] In addition, morphology control and surface modification are also able to alter the range of light absorption.…”

“…In the photooxidation of CH 4 ,s emiconductor/semiconductor hybrids are commonly used. [20,21,26,35,38,48] Forexample, Li et al synthesized aC uO-loaded ZnO catalyst for the photocatalytic total oxidation of methane (TOM). [26] The loading of CuO with aband gap of 1.7 eV not only promotes the absorption of visible light but also slightly narrows the band gap of ZnO,thereby leading to ashift of the absorption edge of ZnO to al onger wavelength.…”

“…Oxygen is anonmetallic oxidant with ahigh reactivity and low toxicity that possesses the ability to readily form various oxides with most elements and compounds.Oxygen is widely used as the oxidant in av ariety of oxidation reactions, including the photooxidation of methane. [20,21,26,30,31,36,55,[101][102][103][104] Themain reactions of the methane-oxygen system are TOM and POM. TOM offers the possibility of efficiently removing trace amounts of methane,while POM offers an eco-friendly way to produce syngas,C 2 hydrocarbons,a nd oxygenates at RT and ambient pressure.…”

Photoelectrochemical Conversion of Methane into Value-Added Products

“…In addition, light intensity has a significant effect on methane oxidation in the PC system. Wei et al investigated the effect of light intensity on the photocatalytic performance of Ga 2 O 3 /AC composite for methane oxidation [48]. Wei et al reported that the oxidation of methane is directly proportional to the intensity of the irradiation, indicating that light plays a major role in CH 4 oxidation via PC system.…”

Methane Conversion Under Mild Conditions Using Semiconductors and Metal-Semiconductors as Heterogeneous Photocatalysts: State of the Art and Challenges

“…This increase of activity was ascribed to a strong adsorption capacity and improved separations of photoelectrons ( e − ) and vacancies ( h + ) pairs. The authors consider this method promising to remove low concentrations of methane ( Wei et al, 2017 ).…”