## 3 Results and Discussion
### Effect on Product Yield and Composition
#### 3.3.3 Effect on Shale Oil Composition  
The results of SARA composition analysis of various shale oil samples are presented in Figure 8. After the addition of AlCl3-6H2O by both mixing methods, the saturated hydrocarbon content of shale oil is significantly reduced, the aromatic hydrocarbon and asphaltene contents are slightly increased, and the resin content is significantly increased. These results suggest that the addition of AlCl3-6H2O promotes the breaking of heteroatomic bonds and the transportation of primary products during kerogen pyrolysis. In addition, the substantial removal of carbonate during mixing or pyrolysis resulted in the formation of more pore space. This increase in pore space and the release of carbon dioxide can make it easier for the complex structural products from kerogen cracking to be generated and transported, thus reducing the occurrence of its secondary cracking, leading to a significant increase in the resin content and a considerable decrease in the saturated hydrocarbons content. In addition, the large amount of carbon dioxide produced during pyrolysis at high temperatures in the dry-mixed samples further facilitated the transportation of primary products, leading to a significant increase in the resin content of the shale oil samples obtained by pyrolysis at 520 \({}^{\circ}\)C.  
Table 3 shows the results of ultimate analysis (N, C, H, O, and S) of various shale oil samples. The results show that the addition of AlCl3-6H2O has little effect on the elemental composition of shale oil products. However, a slight reduction in H/C was observed in samples added to AlCl3-6H2O, which is due to the increasing ratios of aromatic hydrocarbons and resins and the decreasing content of saturated hydrocarbons. This is consistent with the results of the SARA analysis. Figure 7: Shale oil yields at different temperatures in various pyrolysis experiments. Figure 9 shows the fraction composition results of various shale oil samples. It suggests that the compositions of shale oil obtained via DMOS+AlCl3-6H2O and WMOS + AlCl3-6H2O at 400 \({}^{\circ}\)C were remarkably different. The shale oil obtained from DMOS + AlCl3-6H2O contains less gasoline and diesel and more distillate and heavy oil. This happens because a significant amount of carbon dioxide escapes during the pyrolysis of the DMOS+AlCl3-6H2O, promoting the release of the heavy fraction and reducing the level of the light fraction. There is no large amount of carbon dioxide produced from WMOS + AlCl3-6H2O, which prolongs the conversion time of heavy hydrocarbons. After that, the shale oil obtained via DMOS+AlCl3-6H2O and WMOS+ AlCl3-6H2O at 520 \({}^{\circ}\)C both have lower gasoline, diesel and distillate, but higher heavy oil than the shale oil obtained from OS. This implies that the significant increase in pore space caused by AlCl3 can greatly enhance the generation and transport of heavy components at high temperatures. Figure 10a shows the GC-MS analysis results of various shale oil samples. The normal hydrocarbons are the main components in all shale oil samples, with a bimodal distribution of n-alkanes and n-alkenes in the spectrum, and their chain lengths were marked at intervals. The normal hydrocarbons were divided into two parts based on the chain length: short-chain (C9-C21) and long-chain (C22-C32), and their contents, determined based on the peak area in the above-mentioned spectrum, are shown in Figure 10b. Figure 8: The SARA composition of various shale oil products.