Enhanced Catalyst Activity of WO₃ Using Polypyrrole as Support for Acidic Esterification of Glycerol with Acetic Acid

Figure 6

NH₃-TPD profiles of (a) pure Ppy and WO₃-Ppy with particle loadings of (b) 20, (c) 15, (d) 10, (e) 5 wt%, and (f) WO₃ NPs, respectively.