1. A silicoaluminophosphate molecular sieve having a schematic chemical composition, expressed on a molar basis, of mSiO2·Al2O3·nP2O5, wherein m represents the molar ratio of SiO2 to Al2O3 and is in a range of about 0.005 to about 0.15, n represents the molar ratio of P2O5 to Al2O3 and is in a range of about 0.7 to about 1.1, wherein the molecular sieve has an X-ray diffraction pattern exhibiting a relative intensity profile as shown in the following table:
|
|
Interplanar spacing |
Relative intensity |
2 theta (°) |
(Å) |
(I/I0) × 100 |
|
8.30-8.60 |
10.27-10.64 |
VS |
13.67-14.00 |
6.32-6.44 |
VS |
16.15-16.39 |
5.40-5.48 |
W-M |
16.41-16.61 |
5.33-5.40 |
W-M |
21.26-21.59 |
4.11-4.18 |
M |
21.62-21.90 |
4.05-4.10 |
M-S |
23.94-24.33 |
3.65-3.71 |
W-M. |
|
| |
|