Methane conversion coupled with hydrogen production from water using Au/Ga₂O₃ photocatalysts prepared by different methods

Abstract

Au/Ga2O3 photocatalysts were prepared by three different methods (pre-formed Au nanoparticles, borohydride reduction, and impregnation-H2 reduction) and tested as photocatalysts for methane conversion coupling with hydrogen production from water. The...

Methane conversion and hydrogen production over TiO2/WO3/Pt heterojunction photocatalysts

“…The photocatalytic activity of the photocatalysts was evaluated in a gas-liquid-solid system, described in our previous works. 19,21 In a typical procedure, 75 mg of the photocatalyst was dispersed in 250 mL of ultrapure water (18.2 MO cm @ 25 1C) in a commercial 250 mL Ace reactor. A steady stream of CH 4 (under 25 mL min À1 of flow rate, controlled with a mass flow controller) was constantly circulated through the suspension during the reaction, whereas a 450 W Hg lamp (UVA/B/C) was used as a light source.…”

“…Despite progress, additional efforts must be done to bridge the gap between experimental studies and industrial implementation, which remains extremely challenging. 14 Many kinds of semiconductor-based photocatalysts, such as TiO 2 , 15 GaN, 16,17 Ga 2 O 3 , 18,19 BiVO 4 20 and ZnO, 21 have been developed for various types of methane conversion, including direct and indirect routes, tuning the product selectivity. The CH 4 conversion and the selectivity of C 2 H 6 are both low on pristine TiO 2 due to poor separation efficiency of the photogenerated carriers, resulting in the production of undesired but thermodynamically favorable overoxidized products (i.e., CO and CO 2 ).…”