Synergistic Effect of Zinc and Iron in the CO<sub>2</sub>-Assisted Oxidative Dehydrogenation of Propane
Xinbao Zhang, Junjie Li, Wen Liu, Yingbin Zheng, Jie An, Wenjie Xin, Zhenni Liu, Longya Xu, Xiujie Li, Xiangxue Zhu
Abstract
The CO 2 -assisted oxidative dehydrogenation (CO 2 -ODH) of C 3 H 8 provides a promising process for producing C 3 H 6 and utilizing CO 2 . In this study, the combination of zinc and iron demonstrated a synergistic effect, leading to improved catalytic activity and stability. The importance of the reducibility of ZnFe 2 O x /S-1 has been highlighted through auxiliary experiments and comprehensive characterizations. The presence of sodium additives is found to hinder the reduction of ZnFe 2 O x /S-1 by inducing strong interactions. Furthermore, during the initial stage of the reaction, the reduction process initiates the catalytic activity and promotes CO 2 conversion through decarbonization reactions. The precursor of ZnFe 2 O 4 and the strong interaction between Zn and Fe species, along with the formation process of α-Fe from inside to outside, effectively prevent the occurrence of the reforming reaction and suppress the coking deactivation of ZnFe 2 O x /S-1. This study provides fundamental insights into Zn- and Fe-based catalysts in the CO 2 -assisted oxidative dehydrogenation reaction.