Acidic properties of BEA-L, BEA-S and theirs modified H-beta zeolitesa.
| Samples | Total acid (μmol g−1) | Brønsted acid sites (μmol g−1) | Lewis acid sites (μmol g−1) | ||
|---|---|---|---|---|---|
| 200 °C | 350 °C | 200 °C | 350 °C | ||
| BEA-L | 197 | 159 | 73 | 204 | 234 |
| 1.44% SiO2/g BEA-L | 170(−14.4%) | 75(−52.8%) | 72(−1.4%) | 255(+25.0%) | 291(+24.3%) |
| 4.32% SiO2/g BEA-L | 167(−16.6%) | 75(−52.8%) | 14(−80.8%) | 304(+49.3%) | 318(+35.9%) |
| 7.20% SiO2/g BEA-L | 164(−16.9%) | 61(−61.0%) | 24(−67.1%) | 212(+3.7%) | 265(+13.2%) |
| BEA-S | 197 | 263 | 211 | 117 | 112 |
| 1.44% SiO2/g BEA-S | 182(−7.6%) | 254(−3.4%) | 183(−13.3%) | 131(+12.0%) | 109(−2.7%) |
| 4.32% SiO2/g BEA-S | 167(−14.8%) | 250(−4.9%) | 179(−15.2%) | 157(+34.2%) | 125(+11.6%) |
| 7.20% SiO2/g BEA-S | 160(−18.7%) | 237(−9.9%) | 172(−18.5%) | 119(+1.7%) | 95(−15.2%) |
a
( ): Change in the amount of acid sites.