Publication date: 6th November 2020
The selective oxidation of methane into methanol is a win-win process that contributes to reduce greenhouse gas emissions and at the same time, it allows to obtain a liquid compound that can be directly used as a clean energy fuel or as feedstock for chemical manufacturing. Among the different catalytic paths, the photocatalytic route might be promising because it enables this conversion to proceed under mild conditions. Prior studies indicate that WO3 is a good candidate for this selective oxidation. Since ordered mesoporous catalysts show a large surface area and improved light-harvesting abilities, in the present work we evaluate the photocatalytic performance of an ordered mesoporous WO3 for the selective oxidation of methane to methanol with water. Moreover, the influences of La doping and surface fluorination on the resulting methanol yields were also investigated. The mesoporous WO3 showed an improved photocatalytic performance in comparison with a commercial WO3, due to its high surface area and interconnected porous structure. Moreover, the modification of WO3 with La resulted in a remarkable selectivity to methanol, which was attributed to the modification of the acid-base properties that increases the adsorption of water and the generation of adsorbed hydroxyl radicals on this material. These functional groups are key intermediates that promote the formation of methanol. Thus, a rational design of the surface properties and morphology must be considered to develop efficient materials towards this selective oxidation.
This work was supported by the Framework 7 program under the projects CEOPS (FP7-NMP-2012-309984).
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