Table 3.
Chemical composition, BET surface area, and micro-pore volume of the synthetic Al–Si catalyst from cogon grass.
| Composition (% wt.) | Al–Si/20-80 | Al–Si/40-60 | Al–Si/60-40 | Al–Si/80-20 |
|---|---|---|---|---|
| SiO2 | 73.20 | 60.90 | 37.60 | 21.50 |
| Al2O3 | 24.30 | 37.20 | 61.10 | 77.90 |
| CaO | 0.71 | 0.53 | 0.41 | 0.15 |
| SO3 | 0.53 | 0.47 | 0.29 | 0.23 |
| P2O5 | 0.38 | 0.26 | 0.19 | 0.00 |
| Na2O | 0.36 | 0.31 | 0.19 | 0.00 |
| MgO | 0.16 | 0.00 | 0.00 | 0.00 |
| Fe2O3 | 0.15 | 0.12 | 777 ppm | 684 ppm |
| K2O | 0.11 | 760 ppm | 529 ppm | 300 ppm |
| Others | 0.10 | 0.21 | 0.22 | 0.22 |
| BET surface area (m2g−1) | 102 | 143 | 200 | 163 |
| Total pore volume (cm3g−1) | 0.30 | 0.47 | 0.72 | 0.58 |