Photocatalytic highly selective generation of HCHO by TiO2 nanosheets

作者：Shuai Liu, Chunhu LI, Lingyu Piao · 发表于：Journal of Fuel Chemistry and Technology · 年份：2025 · DOI：10.3724/2097-213x.2024.jfct.0039 · 被引用次数：1 · 研究领域：Advanced Photocatalysis Techniques、Catalytic Processes in Materials Science、Gas Sensing Nanomaterials and Sensors

Under mild conditions, selective conversion of methane to C1 chemicals, such as HCHO, CH 3 OH, etc, is a very attractive CH 4 conversion pathway. At present, in order to improve the yield of liquid oxygenates, most methane oxidation is carried out under pressurized conditions, which results in a large number of products without obvious selectivity. To overcome this shortcoming, this study was carried out at room temperature and pressure without any oxidant. By adjusting the crystal facet of anatase TiO 2 , the TiO 2 -001 nanosheets were prepared by hydrothermal method, and the single liquid oxygenate HCHO 767 μmol/(g·h) with selectivity of 83.3% and C1 liquid oxygenate (HCHO+CH 3 OH) with selectivity of 100%. Various characterization methods (TEM, XRD, XPS, EPR) confirmed that the exposure of the crystal facet of TiO 2 -001 and the high surface hydroxyl group (Ti-OH) could promote the generation of ·OH, optimize the reaction path, and promote the highly selective generation of HCHO. This work is of great significance for controlling free radical species and generating single liquid oxygenates with high selectivity.