Mr. Mohammad Mehrizi

Zhengzhou University
China

Abstract Title: The Evaluation of Catalytic Performance, Electron Transfer Property Among Active Metals, and Investigation of Preferred Intermediates of Fe-Based Catalysts under the Function of Cu and K Metals During Low-Temperature Reverse Water-Gas Shift Reaction

Biography:

Mohammad Mehrizi studied in the field of Polymer engineering and received his master's degree from Islamic Azad University (IAU) Science and Research Branch in Iran. He advanced his academic career as a PhD student from 2021 through working on enhancing the efficiency of Fe-based catalysts for CO2 conversion to CO product at low temperatures under the supervision of Prof. Han at Zhengzhou University, China.

Research Interest:

Shanghai 200237, People’s Republic of China. The reverse water-gas shift (RWGS) reaction is acknowledged as a platform reaction for converting CO2 into valuable products. The primary objective of this study is to evaluate Fe-based catalysts in the presence of copper (Cu) and potassium (K) species. Here, we report that an optimal ratio of Cu metal in a K-promoted catalyst, Al2O3/Fe-Cu-K, significantly modified the catalytic structure and created a high level of CO2 conversion (approximately 21.9%), as well as ~100% selectivity to CO product at 400 °C and a notable reduction in activation energy value (Ea) by 47.5390 kJ/mol. Emphasis is placed on the roles of K atoms and Cu metal in augmenting oxygen vacancies and modifying reaction pathways. For this objective, the influence of Cu and K atoms on the variation of preferred intermediates, potential pathways, and thermodynamics is precisely analyzed using a series of ex situ and in situ techniques, such as in situ FTIR and XPS analysis, to reveal the function of K atoms in facilitating the carboxylate route while concurrently inhibiting the formate route, as evidenced in the Al2O3/Fe-Cu-K sample. In addition, based on X-ray photoelectron spectroscopy (XPS) analysis, we observed that K and Cu atoms can alter the intensity of Fe2O3 reduction and electron transfer capacity. The presence of K atoms can modify the capacity of ionic Cu states (Cu1+ and Cu2+), thereby facilitating electron displacement and promoting the reducibility of Fe2+, which ultimately leads to a downward shift in the Fe2+ peak and a clear increase in the Fe3+ peak intensity. Keywords: RWGS, Fe-Cu catalysts, K promoter, Operando technique, Kinetics