Oxidative dehydrogenation of propane to propene with carbon dioxide catalyzed by PtSn/Ce1−xZrxO2
Year: 2024
Type: article
Abstract: The oxidative dehydrogenation of propane with carbon dioxide (CO2-ODP) is an energy-saving, efficient, and environmentally friendly process for propene production. However, the development of a high-performance catalyst is the key for its industrialization. Based on the understanding that the catalytic CO2-ODP involves the simultaneous activation of propane and CO2 molecules, this work investigates the effect of oxygen defects on the catalytic performance of CO2-ODP over PtSn/Ce1−xZrxO2 (x = 0, 0.4, 0.5, 0.7 and 1.0) from the perspective of the enhanced CO2 activation. The results show that the CO2-ODP reaction catalyzed by PtSn/Ce1−xZrxO2 follows the Mars-van-Krevelen redox mechanism. In comparison with PtSn/CeO2, the introduction of Zr leads to the formation of Ce1−xZrxO2 solid solution in the catalyst, which increases the content of oxygen defects. As a result, the dispersion of Pt, and the ability for the adsorption and activation of CO2 are increased, thus significantly enhance the catalytic performance for CO2-ODP. Among them, the PtSn/Ce0.5Zr0.5O2 catalyst shows the most oxygen defects, the highest Pt dispersion, and the best ability for the adsorption and activation of CO2, so that can supplement the consumed lattice oxygen species over the catalyst during the reaction timely, and promote the redox cycles, resulting in the highest propane conversion (31%). The analysis of the catalyst deactivation indicates that PtSn/Ce0.5Zr0.5O2 shows the best ability for the adsorption and activation of CO2 to supplement the consumed lattice oxygen species, which not only maintains the redox cycles during the reaction, but also promotes the reverse Boudouard reaction and eliminates the carbon deposition, leading to the highest stability.
Source: Scientia Sinica Chimica
Authors: Xing Ren, Guo-Qing Yang, Zhong-Wen Liu
Institution: Shaanxi Normal University
Language: English
Subfield: Catalysis
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4402542535