Hydrogenation of CO<sub>2</sub> to Light Olefins over ZnZrO<sub>x</sub>/SSZ‐13
Siyu Chen, Jiachen Wang, Jiachen Wang, Zhendong Feng, Yiming Jiang, Hanwen Hu, Yuanzhi Qu, Shan Tang, Zelong Li, Jiaxu Liu, Jijie Wang, Jijie Wang, Can Li
Abstract
Abstract Converting CO 2 to olefins is an ideal route to achieve carbon neutrality. However, selective hydrogenation to light olefins, especially single‐component olefin, while reducing CH 4 formation remains a great challenge. Herein, we developed ZnZrO x /SSZ‐13 tandem catalyst for the highly selective hydrogenation of CO 2 to light olefins. This catalyst shows C 2 = −C 4 = and propylene selectivity up to 89.4 % and 52 %, respectively, while CH 4 is suppressed down to 2 %, and there is no obvious deactivation. It is demonstrated that the isolated moderate Brønsted acid sites (BAS) of SSZ‐13 promotes the rapid conversion of intermediate species derived from ZnZrO x , thereby enhancing the kinetic coupling of the reactions and inhibit the formation of alkanes and improve the light olefins selectivity. Besides, the weaker BAS of SSZ‐13 promote the conversion of intermediates into aromatics with 4–6 methyl groups, which is conducive to the aromatics cycle. Accordingly, more propene can be obtained by elevating the Si/Al ratio of SSZ‐13. This provides an efficient strategy for CO 2 hydrogenation to light olefins with high selectivity.