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The decomposition of acetic anhydride in liquid phase on a fosfotungstic Wells–Dawson heteropoly acid (HPA) was investigated by in situ ATR-FTIR spectroscopy. Transient and concentration-modulation excitation spectroscopy (MES) experiments in combination with phase-sensitive detection (PSD) were used to monitor the solid–liquid interface. The MES method is based on the periodic variation of a parameter...
The acylation of anisole with acetic anhydride was carried out in a continuous slurry reactor over mesoporous supported Nafion ® (SAC-13) and heteropolyacid (HPA) catalysts. At 70 °C, using an anisole-rich feed molar ratio of 5:1 and a space velocity of 1.6 g acetic anhydride g −1cat. h −1 , acetic anhydride conversions of 40–50% with excellent selectivity (>95%)...
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