Synergistic effect of catalyst basicity and reducibility on performance of ternary CeO2-based catalyst for CO2 OCM to C2 hydrocarbons

The present investigation focuses on the synergistic effect of catalyst basicity and reducibility on the catalytic activity of binary and ternary CeO2-based catalysts in the CO2 oxidative coupling of methane (CO2 OCM). Proper amount of medium and strong basic sites together with lower amount of very strong basic sites are identified as pertinent factors in increasing the catalytic performance. The CO2-TPD and H2-TPR studies indicate synergistic effect between the catalyst basicity and reducibility for the 12.8CaO–6.4MnO/CeO2 ternary metal-oxide catalyst in enhancing the CO2 OCM performance.

Graphical abstractThe synergistic effect of catalyst basicity and reducibility are vital in enhancing the CO2 OCM process. Introduction of CaO and MnOx on the CeO2-based catalyst modifies the reducibility and basicity behaviours of catalyst and led to enhancement of methane conversion and yield. The activity is enhanced by the proper amount of medium and strong basic sites and high catalyst reducibility. Figure optionsDownload full-size imageDownload as PowerPoint slide