Table 4. Synthesis of Dimethyl Adipate Using Individual Oxides and Mixture of Oxidesa.
entry | catalysts | dimethyl adipate (% yield) |
---|---|---|
1 | SiO2 | 89 |
2 | Al2O3 | 84 |
3 | Fe2O3 | 78 |
4 | SiO2 65 % + 35 % Al2O3 mixture | 86 |
5 | SiO2 60 % + 35 % Al2O3 + 5 % Fe2O3 mixture | 82 |
Reaction conditions: adipic acid: 1 mol, methanol: 6 mol, catalyst: 10% wt/wt, reaction time: 4 h, and reaction temperature: 200 °C.