CuFeO<sub>2</sub> Integrated with Orderly Stacked Multilamellar ZSM-5 Nanosheets for Highly Active and Selective Synthesis of Aromatics from CO<sub>2</sub> Hydrogenation
Yang Cheng, Shujing Li, Han Li, Di Meng, Shuxian Zhang, Ming Qing, Pan Min, Fei Yang, Chengwei Wang, Lei Li, Guangbo Liu, Peng Qin, Chufeng Liu, Hanyao Song, Haozhe Feng, Hao Chen, Jifan Li, Chun-Ling Liu, Noritatsu Tsubaki, Wen‐Sheng Dong
Abstract
Direct conversion of CO 2 to value-added aromatics using renewable hydrogen is gaining significant attention. However, achieving a high aromatic selectivity at high CO 2 conversion remains challenging. Herein, we report a high-performance bifunctional catalyst for CO 2 hydrogenation to aromatics, integrating CuFeO 2 with orderly stacked multilamellar ZSM-5 nanosheets (ML-ZSM-5), synthesized via a facile and low-cost hydrothermal route. This catalyst achieves a high aromatic selectivity of 68.4 and 31.4% light aromatics (BTX: benzene, toluene, and xylene) selectivity at high CO 2 conversion of 59.9%, while minimizing CH 4 and CO selectivity to 2.8 and 5.4%, respectively. In situ XRD and DRIFTS analyses reveal that CuFeO 2 exhibits a high carburization rate, generating abundant iron carbides and active surface CH x species, leading to the production of abundant long-chain olefin intermediates. The ML-ZSM-5 component, with its orderly multilayered nanosheet structure, exhibits great mass transfer and limited external surface acidity. This facilitates rapid diffusion of both olefin intermediates and aromatics, favorably shifting the equilibrium of CO 2 hydrogenation and subsequent aromatization, thereby enhancing CO 2 conversion and aromatics selectivity. Meanwhile, the efficient diffusion of hydrogen species away from ML-ZSM-5, coupled with their consumption by CuFeO 2 in the CO 2 -FTS reactions, further enhances hydrogenation activity. Hence, a synergistic, “dual-gear conveyor belt” mechanism between the bifunctional components facilitates highly active and selective hydrogenation of CO 2 to aromatics. Furthermore, the limited external surface acidity of ML-ZSM-5 also improves the selectivity of BTX. This work offers a promising route to high-performance bifunctional catalysts for the selective hydrogenation of CO 2 to aromatics.