Engineering Lattice Dislocations of TiO<sub>2</sub> Support of PdZn−ZnO Dual‐Site Catalysts to Boost CO<sub>2</sub> Hydrogenation to Methanol
Xiaoshen Li, Xiaoshen Li, Qingpeng Cheng, Yingtian Zhang, Yunhao Liu, Yu Pan, Dejian Zhao, Shaohui Xiong, Wei Liu, Xueyang Jiang, Jiayan Yan, Xiang Duan, Ye Tian, Xingang Li, Xingang Li
Abstract
Abstract CO 2 hydrogenation to methanol using green hydrogen derived from renewable resources provides a promising method for sustainable carbon cycle but suffers from high selectivity towards byproduct CO. Here, we develop an efficient PdZn−ZnO/TiO 2 catalyst by engineering lattice dislocation structures of TiO 2 support. We discover that this modification orders irregularly arranged atoms in TiO 2 to stabilize crystal lattice, and consequently weakens electronic interactions with supported active phases. It facilitates the transformation of metallic Pd into PdZn alloy, effectively suppressing CO production through inhibiting the reverse water‐gas shift reaction mediated by the carboxylate pathway on Pd 0 sites. Moreover, it enables the efficient transfer of hydrogen species via hydrogen spillover from PdZn alloy to ZnO for compensating the poor hydrogen dissociation ability of ZnO, thereby creating both more oxygen vacancies essential for CO 2 activation and a hydroxyl‐rich environment conducive to hydrogenation of intermediates. These collective modifications on PdZn−ZnO dual sites synergistically induce the propensity of the formate pathway for methanol synthesis. Consequently, compared to the unmodified catalyst, our as‐designed catalyst increases methanol selectivity from 64.2 to 80.0 %, reduces CO selectivity from 35.0 to 19.8 %, and achieves an impressive methanol space‐time yield of 9028.0 mg MeOH g Pd+Zn −1 h −1 at a similar CO 2 conversion (~8.0 %).