Selective Production of Aromatics Directly from Carbon Dioxide Hydrogenation

作者：Xu Cui, Peng Gao, Shenggang Li, Chengguang Yang, Ziyu Liu, Hui Wang, Liangshu Zhong, Yuhan Sun · 发表于：ACS Catalysis · 年份：2019 · DOI：10.1021/acscatal.9b00640 · 被引用次数：321 · 研究领域：Catalysts for Methane Reforming、Carbon dioxide utilization in catalysis、Zeolite Catalysis and Synthesis

Conversion of carbon dioxide (CO 2 ) to fuels and chemicals with the help of renewable hydrogen (H 2 ) is a very attractive approach to reduce CO 2 emissions and replace dwindling fossil fuels. However, it is still a great challenge to synthesize aromatics directly from CO 2 hydrogenation, because CO 2 is thermodynamically very stable, and the aromatics are highly unsaturated products with complex structures. Here, we demonstrate that the combination of the sodium-modified spinel oxide ZnFeO x, which alone shows excellent performance for CO 2 hydrogenation to olefins, and hierarchical nanocrystalline HZSM-5 aggregates can realize a highly efficient synthesis of aromatics directly from CO 2 and H 2 . The maximum of aromatics selectivity was up to 75.6% among all hydrocarbons at 41.2% CO 2 conversion. Additionally, the selectivity toward CO and CH 4 is usually less than 20% over this catalyst system. The suitable amount of the residual sodium, hierarchical pore structure, and appropriate density of Brønsted acid sites endow the composite catalyst with an outstanding aromatics yield and high catalytic stability.