Citation: Xiaohai Zheng, Jiaming Cai, Wentao Zhao, Shijing Liang, Yong Zheng, Yanning Cao, Lijuan Shen, Yihong Xiao, Lilong Jiang. Porous α-Fe₂O₃/SnO₂ nanoflower with enhanced sulfur selectivity and stability for H₂S selective oxidation[J]. Chinese Chemical Letters, ;2021, 32(7): 2143-2150. doi: 10.1016/j.cclet.2020.11.017 shu

Porous α-Fe₂O₃/SnO₂ nanoflower with enhanced sulfur selectivity and stability for H₂S selective oxidation

National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, China

jliang2011@gmail.com

syhgslj@fzu.edu.cn

Received Date: 31 July 2020
Revised Date: 21 September 2020
Accepted Date: 8 November 2020
Available Online: 10 November 2020

Figures(4)

Being abundant and active, Fe₂O₃ is suitable for selective oxidation of H₂S. However, its practical application is limited due to the poor sulfur selectivity and rapid deactivation. Herein, we report a facile template-free hydrothermal method to fabricate porous α-Fe₂O₃/SnO₂ composites with hierarchical nanoflower that can obviously improve the catalytic performance of Fe₂O₃. It was disclosed that the synergistic effect between α-Fe₂O₃ and SnO₂ promotes the physico-chemical properties of α-Fe₂O₃/SnO₂ composites. Specifically, the electron transfer between the Fe²⁺/Fe³⁺ and Sn²⁺/Sn⁴⁺ redox couples enhances the reducibility of α-Fe₂O₃/SnO₂ composites. The number of oxygen vacancies is improved when the Fe cations incorporate into SnO₂ structure, which facilitates the adsorption and activation of oxygen species. Additionally, the porous structure improves the accessibility of H₂S to active sites. Among the composites, Fe1Sn1 exhibits complete H₂S conversion with 100% sulfur selectivity at 220 ℃, better than those of pure α-Fe₂O₃ and SnO₂. Moreover, Fe1Sn1 catalyst shows high stability and water resistance.
- Hierarchical structure,
- Oxygen vacancy,
- Synergistic effect
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Porous α-Fe₂O₃/SnO₂ nanoflower with enhanced sulfur selectivity and stability for H₂S selective oxidation