Production of bioadditives from glycerol esterification over zirconia supported heteropolyacids

► H4SiW12O40/ZrO2 is an effective catalyst for glycerol esterification. ► A 93.6% combined selectivity of glyceryl diacetate and triacetate is achieved. ► H4SiW12O40/ZrO2 can be reused up to four consecutive runs without deactivation. ► H4SiW12O40/ZrO2 can be resistant to the impurities present in bulk glycerol.