Evolution characteristics of products retorted from Gonghe oil shale based on TG-FTIR and Py-GC/MS

TG-FTIR was applied to investigate the generation of major products and mass loss characteristics of Gonghe (GH) oil shale. Py-GC/MS was performed to analyze products distribution. The results show that the maximum weight loss rate peak appears at about 457???C. There are strong correlations between CO2 and CO, C=O and C=C functional groups, CH4 and C-H functional groups, SO2 and S=O functional groups. Through comparative analysis of two isothermal retorting experiments, the secondary reactions of the retorting products of Gonghe oil shale play the leading role in the constant temperature section. 520???C gives more complete volatilization and desulfurization than 470???C. Py-GC/MS analysis shows that the higher the temperature, the lower the content of saturated hydrocarbons and oxygen-containing heteroatom compounds, and the higher the content of unsatu-rated hydrocarbons. The C8-C17 saturated hydrocarbon content is the highest at 520???C, while the C18-C24 unsaturated hydrocarbon content is the lowest. Superscript/Subscript Available

Automated summary

TG-FTIR and Py-GC/MS techniques were used to investigate the generation of products and mass loss characteristics of Gonghe oil shale. The results showed that there was a peak of maximum weight loss rate at around 457℃, and there were strong correlations between different functional groups. The secondary reactions of the retorting products played a leading role in the constant temperature section, and 520℃ showed more complete volatilization and desulfurization compared to 470℃. Higher temperatures led to lower content of saturated hydrocarbons and oxygen-containing heteroatom compounds, and higher content of unsaturated hydrocarbons.