## 3 Results and Discussion
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multicolumn{1}{c}{**Internal Tetrahedra**} & \multicolumn{2}{c}{**External Tetrahedra**} \\ \hline
**Vibration** & **Wavenumber (cm\({}^{-1}\))** & **Vibration** & **Wavenumber (cm\({}^{-1}\))** \\ \hline Asymmetric stretch (b) & 1250–950 & Asymmetric stretch (a) & 1050–1150\({}^{\text{Sh}}\) \\ Symmetric stretch (d) & 720–650 & Symmetric stretch (c) & 750–820 \\ Bend (T-O) (f) & 420–500 & Double ring (e) & 650–500 \\ \hline \hline \end{tabular} \({}^{\text{Sh}}\) Shoulder; the letters in parentheses indicates the position of the bands in Figure 4.  
\end{table} 
Table 1: Wavenumbers and assignments for the main absorption bands of the infrared spectra of the ALPO-11. Figure 4: Infrared spectra of the samples obtained during the crystallization of AlPO\({}_{4}\)-11, at different synthesis times. The absorption bands (e) and (f) were used for determination of the crystallinity. From TG curves is important to observe that the samples removed after 6 h of heating (S6h sample) presented a similar behavior, with two steps of weight losses, except for the S74h sample, that presented a third step of weight loss in the temperature range from 400 to 550 \({}^{\circ}\)C which was attributed to the presence of amorphous material, since the samples S2h and S4h also showed the same weight loss, in the same temperature range. The TG/DTG data are given in Table 2.  
From DTG curves, two steps of weight losses were identified, one relative to the water in the temperature range from ambient to 150 \({}^{\circ}\)C and the other relative to the di-isopropylamine in the temperature range from 180 to 380 \({}^{\circ}\)C, in which the mass of each event was measured. For transforming the mass values in volume, it was assumed that the water and di-isopropylamine molecules occupy the pores of the AlPO4-11 in the liquid state. A detailed description of this method is found in [23]. It is interesting to note that the value of adsorption capacity reported by [PERSON] et al. [24] for the AlPO4-11 measured over saturation of water was approximately 0.16 cm\({}^{3}\)g\({}^{-1}\). The values reported here for pore volume total are in excellent agreement with the literature [24]. However, both the values are larger than the theoretical value calculated from XRD crystallographic data, by [PERSON] et al. [25] which was 0.134 cm\({}^{3}\)g\({}^{-1}\). This difference is because, in the condition of \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Sample**} & \multicolumn{2}{c}{**Pore Volume Occupied by Molecules (cm\({}^{3}\) g\({}^{-1}\)) a**} \\ \cline{2-3}  & **Water** & **DIPA** & **Total** \\ \hline S6h & 0.048 & 0.129 & 0.177 \\ S10h & 0.047 & 0.121 & 0.168 \\ S15h & 0.038 & 0.126 & 0.164 \\ S48h & 0.034 & 0.134 & 0.168 \\ S74h & 0.027 & 0.126 & 0.153 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Pore volume of the AlPO4-11 samples, determined from TG/DTG analyses. Figure 5: TG and DTG curves of the solids obtained during the crystallization of AlPO4-11, at different synthesis times. saturation, the adsorption occurs on the intergranule pores (meso and macroopores) and the theoretical value is only related to the microporous volume. The obtained values suggest that molecules of water are in the meso and macroopores whereas the molecules of DIPA are in the micropores of the aluminophosphate. These results were also found for SAPO-5 [26]. It was observed that the values of microporous volume determined over of the molecules of DIPA are very close to the theoretical calculated value. The crystallinity degree of the samples was determined from XRD by the measurement of the area below the peaks in the range of 20 from 21 to 24 degrees. The sample that presented larger area was considered as 100% crystalline (S48 sample), and the areas of the others were normalized in relation to this, which was considered as standard sample.