Table 2.
Catalytic behavior of the zeolites studied after 15 min under microwave irradiation. Reaction conditions: 5.0 wt. % of catalyst referred to initial glycerol, TBA/G ratio = 4, reaction temperature 75 °C.
| Catalizador | XG (%) | SMTBG (%) | Sh-GTBE (%) |
|---|---|---|---|
| HY | 9 | 87 | 13 |
| C-HY | 33 | 75 | 25 |
| M-HY | − | − | − |
| M-HY-O(3) | 59 | 78 | 22 (2.1) a |
| M-HY-O(3) b | 30 | 80 | 20 (1.5) |
| M-HY-O(3) c | 53 | 81 | 19 (1.7) |
| M-HY-O(24) | 22 | 81 | 19 |
| HZSM-5 | 4 | 99 | 1 |
| C-HZSM-5 | 19 | 93 | 7 |
| M-HZSM-5 | − | − | − |
| M-HZSM-5-O(3) | 54 | 78 | 22 (1.5) |
| M-HZSM-5-O(24) | 6 | 95 |
a In parenthesis, selectivity to glycerol triether (%) Spent catalyst: b after washed with ethanol; c after reflux with ethanol.