Improved Catalytic Performance of Ethane Dehydrogenation in the Presence of CO2 over Zr-Promoted Cr/SiO2

Xinyi Li; Shuangfei Liu; Haoran Chen; Shi-Zhong Luo; Fangli Jing; Wei Chu

doi:10.1021/acsomega.9b03301

Improved Catalytic Performance of Ethane Dehydrogenation in the Presence of CO₂ over Zr-Promoted Cr/SiO₂

ACS Omega. 2019 Dec 19;4(27):22562-22573. doi: 10.1021/acsomega.9b03301. eCollection 2019 Dec 31.

Authors

Xinyi Li¹, Shuangfei Liu¹, Haoran Chen², Shi-Zhong Luo¹, Fangli Jing¹, Wei Chu¹

Affiliations

¹ Department of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, 610065 Chengdu, China.
² West China School of Stomatology, Sichuan University, No. 17 Section 3, Renmin South Road, 610041 Chengdu, China.

Abstract

The Zr-, Ce-, Sr-, and Sn-promoted Cr/SiO₂ catalysts were prepared by the incipient wetness impregnation method, then characterized by N₂ adsorption/desorption, X-ray diffraction, X-ray photoelectron spectroscopy, H₂-TPR, CO₂-TPD, UV-vis, high-angle annular dark-field imaging-scanning transmission electron microscopy-energy dispersive X-ray spectroscopy elemental mapping, Raman, and thermogravimetric techniques to study the structural evolution under the preparation/reaction conditions, and applied to catalyze ethane oxidative dehydrogenation with CO₂. The results suggested that the Cr⁶⁺ species were indispensable for activating the dehydrogenation reaction thanks to the oxidation-reduction cycle between Cr⁶⁺ and Cr³⁺. The type of the promotor also affected significantly the ability of replenishing the lattice oxygen through the disassociation of CO₂, leading to the different catalytic performances. The Zr-promoted sample had the best performance in converting the reactants as well as the catalytic stability.