The next step of this work was to study the effect of LDH and MMO as catalysts in the catalytic process. As shown in Table , the highest yields were obtained when the reactions were carried out in the presence of KI. In contrast, the yields decrease notably in the absence of KI for both materials. In comparative terms, between LDH and MMO, we observed that the calcined materials were more efficient during the catalytic process, as indicated by the difference in MMO MgCrO and NiAlO, for which 93% and 90% conversion, respectively, were achieved after 24 hours of reaction (Table , entries 5 and 4). Figure shows the reaction kinetics of the process catalysed by MgCrO and NiAlO. In both cases, the maximum yield is reached after 24 h of reaction. a Yields of the isolated product after chromatographic purification With these results in hand, we focused on studying the reaction trend with other epoxides. Table shows the results of the CO2 cycloaddition reactions to the epoxides corresponding to obtain cyclic carbonates 2b-2d. The six different MMOs were evaluated, confirming that MgCrO and NiAlO are the best catalysts for achieving high yields (Table ).