Oxidative Dehydrogenation of Propane with Carbon Dioxide Catalyzed by Zn<sub><i>x</i></sub>Zr<sub>1–<i>x</i></sub>O<sub>2–<i>x</i></sub> Solid Solutions
Guoqing Yang, Ya-Jiao He, Yonghong Song, Jian Wang, Zhao‐Tie Liu, Zhao-Tie Liu, Zhong-Wen Liu, Zhong-Wen Liu
Abstract
Although the oxidative dehydrogenation of propane with CO 2 (CO 2 -ODP) is a sustainable route for producing propylene with the tandem conversion of CO 2 to the value-added CO, its industrialization is still challenged by the lack of an efficient catalyst, which originates from the insufficient understanding of the catalytic nature and reaction mechanism. In this work, ZnO-ZrO 2 composites were probed as catalysts for CO 2 -ODP. A pure Zn x Zr 1– x O 2– x solid solution was formed over ZnO-ZrO 2 composites with 5–20 mol % ZnO, and the content of oxygen defects was almost directly proportional to the fraction of the solid solution. The amount and the mobility of lattice oxygen over Zn x Zr 1– x O 2– x solid solutions were revealed as key factors in determining the catalytic performance. The CO 2 -ODP reaction over the best 20 mol %ZnO-ZrO 2 catalyst occurred almost stoichiometrically via the redox mechanism, which can be an important guideline for further developing a high-performance catalyst for CO 2 -ODP.