Direct synthesis of mesoporous 12-tungstophosphoric acid SBA-15 catalyst for selective esterification of glycerol and lauric acid to monolaurate

作者：Hoo Peng Yong; Abdullah Ahmad Zuhairi^*

来源：Chemical Engineering Journal, 2014, 250: 274-287.

DOI：10.1016/j.cej.2014.04.016

• 12-Tungstophosphoric acid
• Mesoporous SBA-15 catalyst
• Glycerol esterification
• Direct synthesis
• Monolaurate selectivity

Via direct synthesis method, highly uniformed SBA-15 catalysts functionalized with 12-tungstophosphorus acid (HPW) were synthesized. Their characteristics were investigated using BET surface analysis, NH3-TPD, FTIR, SEM, TEM, EDS and TGA. Surface defects were found in catalysts with high HPW loading (30-40 wt.%). High loadings also caused the deposition of HPW on the external surface and subject to oxidative decomposition to WO3 that affected their acidity. HPW in mesopores had better thermal stability. High lauric acid conversion (70%) and monolaurin yield (50%) were shown in 6 h at 160 degrees C by the catalyst with 20 wt.% HPW. Lower yield was achieved at higher temperature. Its ordered mesoporosity evidently resulted in shape selectivity effect to suppress by-products formation. Effects of reaction temperature (150-170 degrees C), reactant ratios (1:1-5:1) and catalysts loadings (1-5 wt.%) were thoroughly elucidated.

• 出版日期2014-8-15