Room-temperature methanol synthesis via CO2 hydrogenation catalyzed by cooperative molybdenum centres in covalent triazine frameworks

Abstract

Selective hydrogenation of CO2 into methanol offers an ideal route for the utilization of greenhouse gas, but it remains a great challenge to be carried out under mild conditions due to the intrinsic chemical stability of CO2. Here, we report sulfur-bridged cooperative molybdenum binuclear sites anchored on covalent triazine frameworks (denoted as Mo-S-Mo/CTF), as highly efficient active sites for CO2 hydrogenation to methanol at room temperature. Under near-ambient conditions (30 °C, 0.9 MPa), Mo-S-Mo/CTF produces methanol with 96% selectivity and a methanol synthesis rate of 21.88 μmol gMoSx−1 h−1. In-situ spectroscopic characterizations combined with theoretical calculations reveal that Mo-S-Mo/CTF favors CO2 hydrogenation into methanol via the formate pathway at room temperature instead of the CO pathway at 150 °C. The cooperation of CO2 activation on one molybdenum site and H2 splitting on the other plays a key role in high catalytic activity. Our work provides a new direction for methanol synthesis at room temperature.