## 3 Results and Discussion
### Effect on Product Yield and Composition  
#### 3.3.1 Effect on Shale Gas Composition  
The compositional distribution of the gas products collected after different times at constant temperature in various experiments is shown in Table 2. The results show that AlCl\({}_{3}\)-6H\({}_{2}\)O effectively promoted the production of hydrocarbon gas products at 400 \({}^{\circ}\)C. While at 520 \({}^{\circ}\)C, the addition of AlCl\({}_{3}\)-6H\({}_{2}\)O led to an increase in oil products (Figure 7) and  
Figure 4: Adsorption-desorption isotherms of different samples (P: pressure; P\({}_{0}\): saturated vapor pressure).  
Figure 5: Total BET (Brunauer–Emmett–Teller) specific surface area (SSA) and pore volume (PV) of (**a**) OS, various mixed samples, and (**b**) residues.  
an increase in CO\({}_{2}\), which resulted in a decrease in the percentage of cracked gas generated at high temperatures. Both at low and high temperatures, the samples obtained by both mixing methods released significant amounts of carbon dioxide during pyrolysis. This suggests that AlCl\({}_{3}\cdot\)6H\({}_{2}\)O reacts to a large extent with carbonate minerals during pyrolysis to produce large amounts of CO\({}_{2}\). In addition, the DMOS + AlCl\({}_{3}\cdot\)6H\({}_{2}\)O sample clearly released more CO\({}_{2}\) during pyrolysis, which was caused by its internal carbonate not being consumed during dry mixing. This is consistent with the XRD analysis results.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Samples**} & \multirow{2}{*}{**Temperature/\({}^{\circ}\)C Time of Constant Temperature/min**} & \multicolumn{6}{c}{**Primary Components/mole\%**} \\ \cline{3-10}  & & **CH\({}_{4}\)** & **C\({}_{2}\)H\({}_{6}\)** & **C\({}_{2}\)H\({}_{4}\)** & **C\({}_{3}\)H\({}_{8}\)** & **C\({}_{3}\)H\({}_{6}\)** & **CO\({}_{2}\)** \\ \hline \multirow{4}{*}{OS} & \multirow{4}{*}{400} & 0 & 0.56 & 0.17 & 0.12 & 0.07 & 0.12 & 9.50 \\  & & 30 & 5.18 & 2.60 & 0.84 & 1.12 & 1.04 & 3.58 \\  & & 60 & 2.10 & 0.89 & 0.28 & 0.37 & 0.36 & 2.58 \\ \cline{2-10}  & & 0 & 10.32 & 3.00 & 2.59 & 0.62 & 1.85 & 9.51 \\  & & 30 & 0.18 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 \\  & & 60 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 \\ \hline \multirow{4}{*}{DMOS + AlCl\({}_{3}\cdot\)6H\({}_{2}\)O} & \multirow{4}{*}{520} & 0 & 1.61 & 0.48 & 0.30 & 0.21 & 0.40 & 45.56 \\  & & 30 & 7.28 & 3.56 & 0.92 & 1.39 & 1.19 & 10.26 \\  & & 60 & 4.26 & 1.88 & 0.51 & 0.75 & 0.60 & 5.56 \\ \cline{2-10}  & & 0 & 6.16 & 2.49 & 1.57 & 0.80 & 1.19 & 22.87 \\  & & 30 & 0.48 & 0.00 & 0.00 & 0.00 & 0.00 & 3.19 \\  & & 60 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 1.13 \\ \hline \multirow{4}{*}{WMOS + AlCl\({}_{3}\cdot\)6H\({}_{2}\)O} & \multirow{4}{*}{520} & 0 & 2.97 & 1.06 & 0.51 & 0.43 & 0.63 & 23.04 \\  & & 30 & 5.47 & 2.83 & 0.77 & 1.85 & 1.77 & 11.21 \\  & & 60 & 3.46 & 1.30 & 0.41 & 0.67 & 0.67 & 4.25 \\ \cline{2-10}  & & 0 & 6.66 & 2.31 & 1.39 & 0.75 & 1.18 & 12.30 \\ \cline{2-10}  & & 30 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.82 \\ \cline{2-10}  & & 60 & 0.00 & 0.00 & 0.00 & 0.00 & 0.00 & 0.53 \\ \hline \hline \end{tabular}
\end{table}
Table 2: The contents of the primary components in the gas products at different times in various pyrolysis experiments by gas chromatograms.  
Figure 6: Single-point average pore radius based on BET model for (**a**) OS, various mixed samples, and (**b**) residues.