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CONVERSION OF GLYCEROL TO ACRYLIC ACID OVER POLYOXOMETALATE CATALYSTS |
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| รหัสดีโอไอ | |
| Title | CONVERSION OF GLYCEROL TO ACRYLIC ACID OVER POLYOXOMETALATE CATALYSTS |
| Creator | Sarawalee Thanasilp |
| Contributor | Mali Hunsom, Sitthipong Pengpanich, Johannes W. Schwank |
| Publisher | Chulalongkorn University |
| Publication Year | 2557 |
| Keyword | Glycerin, Acrylic acid, Polyoxometalates, กลีเซอรีน, กรดอะคริลิก, โพลิออกโซเมทัลเลต |
| Abstract | This work was carried out to convert glycerol to acrylic acid in liquid phase over supported polyoxometalate (POM) catalysts. The investigated parameters were H2O2 concentration (2.74-6.85 mol/L), reaction temperatures (70-90 oC), POM types (PW, PMo, SiW), support types (Al2O3, SiO2, HZSM-5) and the catalyst to glycerol ratio (2-8 wt%). It was found that the SiW/HZSM-5 catalyst can enhance the conversion of glycerol of around 85.54% at H2O2 concentration of 2.74 mol/L, temperature of 90 oC, the catalyst to glycerol of 4 wt.%. The doping of vanadium (V) at 6 wt.% on the surface of SiW/HZSM-5 (V6-SiW/HZSM-5) catalyst can promote the conversion of glycerol up to 99.67% and provide the yield of glycolic acid, formic acid, acetic acid, acrolein, acrylic acid and propionic acid of 19.45%, 12.03%, 23.62%, 0.25%, 36.23% and 7.06%, respectively. The rate of glycerol conversion was fit with a pseudo-first order reaction with respect to glycerol concentration, with the activation energy of 26.63 kJ/mol. The Eley-Rideal model, assuming a reaction between adsorbed oxygen molecule, obtained from H2O2 dissociation, and glycerol molecule provided the best fit with the experimental results. |
| URL Website | cuir.car.chula.ac.th |
