On the Effect of the M3+ Origin on the Properties and Aldol Condensation Performance of MgM3+ Hydrotalcites and Mixed Oxides

Hydrotalcites (HTCs) are promising solid base catalysts to produce advanced biofuels by aldol condensation. Their main potential lies in the tunability of their acid-base properties varying composition. However, relationship between composition hydrotalcites, basicity, and catalytic performance has not yet been fully revealed. Here, we investigate systematically preparation HTCs with general formula Mg6M3+2(OH)16CO3·4H2O, where M3+ stands for Al, Ga, Fe, In, while keeping Mg/M3+ equal 3. We use an array analytical methods including XRD, N2 physisorption, CO2-TPD, TGA-MS, FTIR-ATR, SEM assess changes concluded that nature affected HTC crystallinity. show basicity HTC-derived mixed oxides decreased increase atomic weight M3+, which was reflected furfural conversion its condensation acetone. demonstrate all MgM3+ can be rehydrated, boosted activity Taking characterization results together, conclude rehydrated is determined “host” MgO component, rather than M3+.