## 3 Results and Discussion
### Analysis of Liquid-Phase Products
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Compound Name**} & \multicolumn{5}{c}{**Relative Content (\%) at Different Gasification Heating Temperatures (\({}^{\circ}\)C)**} \\ \cline{2-10}  & \multicolumn{2}{c}{**600 \({}^{\circ}\)C**} & \multicolumn{2}{c}{**700 \({}^{\circ}\)C**} & \multicolumn{2}{c}{**800 \({}^{\circ}\)C**} & \multicolumn{2}{c}{**900 \({}^{\circ}\)C**} & \multicolumn{2}{c}{**1000 \({}^{\circ}\)C**} \\ \cline{2-10}  & **MG** & **EG** & **MG** & **EG** & **MG** & **EG** & **MG** & **EG** & **MG** & **EG** \\ \hline Ethylbenzene & 2.24 & 3.03 & 2.53 & 2.55 & - & 1.21 & - & 1.33 & 1.72 & - \\
1-Cyclohexene, 1-ethylynl- & 3.46 & 8.43 & 3.74 & 3.24 & 2.46 & 1.34 & - & 2.64 & 1.5 & 1.20 \\ Styrene & 3.87 & 10.59 & 5.15 & 7.10 & 4.75 & 9.25 & - & 9.34 & 3.22 & 8.16 \\ Benzene & - & 2.09 & - & 1.02 & 1.46 & 3.24 & 2.46 & 1.11 & - & 2.85 \\
3-Methylphenylacetylene & 5.84 & 1.72 & 8.35 & 2.15 & 7.67 & 0.92 & 2.01 & 0.31 & 5.86 & - \\ Biphenylene & 2.35 & 6.31 & - & 4.25 & 1.28 & 2.89 & 2.08 & - & 2.14 & 1.62 \\ Hematoporphyrin & 2.02 & 1.02 & - & 3.24 & 1.52 & 1.11 & - & 4.07 & - & 1.28 \\ Rhodopin & - & 5.19 & - & 1.38 & 1.67 & 3.76 & 1.92 & 5.44 & - & 3.20 \\
2-Pentanone & 3.06 & 4.14 & - & 2.56 & 4.97 & - & 7.15 & 1.48 & - & 1.50 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: GC-MS results of oak tar derived from MG and EG. The tar obtained from biomass gasification has a complex composition, as shown via GC-MS analysis. Therefore, the compounds in the tar are classified into five groups, designated as T\({}_{x}\), based on the number of benzene rings in each compound. T\({}_{1}\) to T\({}_{3}\) represent tar fractions comprising one to three benzene rings. T\({}_{4}\) indicates that the tar fraction consists of four or more benzene rings. The remaining products, including hydrocarbons and heterocyclic compounds (excluding benzene rings), are classified as T\({}_{0}\). As shown in Figure 6, the increasing gasification temperature gradually decreases the amount of T\({}_{1}\) tar but has less impact on T\({}_{2}\) tar. Furthermore, the contents of T\({}_{3}\) and T\({}_{4}\) tars are increasing significantly. Additionally, the concentration of T\({}_{0}\) tar initially increases and then decreases. The T\({}_{1}\) content of corn stalk MG decreases from 47.7% to 18.2% as the temperature increases from 600 to 1000 \({}^{\circ}\)C, representing a decrease of 29.5%. Additionally, the contents of T\({}_{2}\), T\({}_{3}\), and T\({}_{4}\) increase from 15.6%, 1%, and 0.9% to 26.3%, 24.3%, and 21.5%, indicating an increase of 10.7%, 23.4%, and 20.6%. The T\({}_{0}\) tar exhibits a decline in content, ranging from a peak of 40.7% at 700 \({}^{\circ}\)C to a nadir of 9.6% at 1000 \({}^{\circ}\)C (Figure 6a). The yield of T\({}_{1}\) tar decreases from 38.2% to 17.3% when the temperature increases from 600 to 1000 \({}^{\circ}\)C. Additionally, the contents of T\({}_{2}\), T\({}_{3}\), and T\({}_{4}\) increase from 16.2%, 0.8%, and 0.5% to 26.3%, 19.3%, and 18.2%, respectively. The content of T\({}_{0}\) tar shows a similar pattern, with a peak of 47.5% at 700 \({}^{\circ}\)C (Figure 6b). It is worth noting that the increases observed in MG are higher than those in EG. This study shows that MG produces tars with more benzene rings than EG. The tar components derived from oak gasification are identical to those from the corn stalk and are unaffected by the heating methods. Alkali and alkaline earth metals (AAEMs), such as K, Na, Ca, and Mg, extensively occur in the biomass growth process and significantly affect the biomass gasification process. AAEMs could promote the secondary reaction of tar and affect the polycondensation conversion of tar. AAEMs improve the release of specific T\({}_{1}\) compounds and enhance the content and species of T\({}_{1}\) compounds in tar. AAEMs could also inhibit the release of T\({}_{2}\)-T\({}_{4}\) compounds. According to [PERSON] et al.