Lattice-Confined Cu-TiO<sub>2</sub> Catalysts with Significantly Improved Activity and Thermal Stability for CO<sub>2</sub> Hydrogenation
Hanming Chen, Shuyi Li, Peijie Ma, Kuan Chang, Zhiying Zhao, Yingjie Lai, Kun Zheng, Qin Kuang, Zhaoxiong Xie
Abstract
Cu-based catalysts have shown promising prospects in the CO 2 hydrogenation reaction but suffer from a significant sintering problem, especially under high temperatures and a reducing atmosphere. Herein, we propose a lattice confinement strategy to fabricate a highly dispersed and thermally stable Cu-TiO 2 catalyst through a facile ion exchange and calcination reconstruction method. The intrinsic CH 3 OH formation rate for the optimal Cu-TiO 2 -600 catalyst reached 55.5 mmol g Cu –1 h –1 at 240 °C and 3 MPa. The structural analysis demonstrated that the catalyst maintained an excellent Cu dispersion even at 400 °C and H 2 conditions, which exhibited an outstanding sintering resistance property and achieved high activity and thermal stability for CO 2 hydrogenation. This work could be potentially extended to construct other lattice-confined catalysts in a heterogeneous catalytic reaction.