Boosting Reactive Oxygen Species Formation Over Pd and VO<sub>δ</sub> Co‐Modified TiO<sub>2</sub> for Methane Oxidation into Valuable Oxygenates
Huanyu Zhou, Fan Chen, Dandan Liu, Xin Qin, Yangchi Jing, Chenyu Zhong, Rui Shi, Yana Liu, Jiguang Zhang, Yunfeng Zhu, Jun Wang
Abstract
Abstract Direct photocatalytic methane oxidation into value‐added products provides a promising strategy for methane utilization. However, the inefficient generation of reactive oxygen species (ROS) partly limits the activation of CH 4 . Herein, it is reported that Pd and VO δ co‐modified TiO 2 enables direct and selective methane oxidation into liquid oxygenates in the presence of O 2 and H 2 . Due to the extra ROS production from the in situ formed H 2 O 2 , a highly improved yield rate of 5014 µmol g −1 h −1 for liquid oxygenates with a selectivity of 89.3% is achieved over the optimized Pd 0.5 V 0.2 ‐TiO 2 catalyst at ambient temperature, which is much better than those (2682 µmol g −1 h −1 , 77.8%) without H 2 . Detailed investigations also demonstrate the synergistic effect between Pd and VO δ species for enhancing the charge carrier separation and transfer, as well as improving the catalytic activity for O 2 reduction and H 2 O 2 production.