Study on Synthesis of Methyl Gallate Catalyzed by Heteropolyacid-loaded Activated Carbon

Methyl gallate was synthesized using the catalyst of H7PW12O42·4H2O (PW12) heteropolyacid supported by activated carbon(AC). The characteristics of the catalyst was investigated in detail including XRD analysis, N2 adsorption and NH3-TPD. The effects of catalyst on reaction conditions were studied. The results showed that under following conditions: gallic acid 0.52mol, methanol 0.4mol, loading amount of PW12 on AC 30%, reaction time 4h and catalyst dosage 5%, the yield of MG could reach 90.1%. The catalyst had a high catalytic activity, could be recovered easily and used repeatedly.