## 3 Results and Discussion
### Analysis of Liquid-Phase Products  
Common compounds of tar are further identified via GC-MS. Tables 5 and 6 present the names and relative contents of partial tar components at various temperatures. Tables S1 and S2 in the Supplementary Materials present more detailed information on tar components. Tar primarily consists of benzene ring compounds, polycyclic aromatic hydrocarbons, and certain aliphatic hydrocarbons. As the gasification temperature increases, most of the primary tar undergoes conversion. Currently, PAHs are increasing while the concentration of tar, consisting of compounds with branched chains or heteroatoms, gradually declines due to ring condensation [52]. During biomass gasification, microwave influence on solid-phase reactions causes variations in tar composition and quantity at the same gasification temperature. These reactions include the decomposition of cellulose and lignin and the Boudouard reaction taking place on the biomass surface. \begin{table}
\begin{tabular}{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 Phenylephrine & - & - & 0.85 & 1.25 & - & 1.82 & 3.73 & 3.73 & - & - \\ Biphenyl & 1.73 & - & 1.36 & - & 1.68 & 1.58 & 2.52 & 2.01 & - & 2.58 \\ Biphenylene & - & - & 1.68 & - & 8.11 & 2.11 & 4.34 & 4.34 & 5.23 & 5.23 \\ Hematoporphyrin & 0.52 & 3.03 & - & 3.03 & 0.25 & 2.55 & - & 1.21 & 2.33 & 1.33 \\ Tricarbonyl & 4.62 & 1.25 & 2.58 & 1.25 & 4.52 & - & - & 2.58 & 0.48 & 1.52 \\ \(3^{\prime}\)H-Cycloprop & 1.44 & 1.44 & 8.43 & 8.43 & 3.24 & 3.24 & 1.34 & 1.34 & 2.64 & 2.64 \\ (1,2)-5-coolest-1-en-3-one & 2.02 & 2.02 & 2.25 & 2.25 & 2.15 & 2.15 & 3.7 & 3.7 & 1.79 & 1.79 \\ Hexadecanamide & 5.19 & 5.19 & - & - & 1.92 & 1.92 & 1.86 & 1.86 & 1.98 & 1.98 \\ Toluene & 4.21 & 4.21 & 2.09 & 2.09 & 1.02 & 1.02 & 3.24 & 3.24 & 1.11 & 1.32 \\ Furfural & - & - & 3.43 & 3.43 & 3.66 & 3.66 & 4.95 & 4.95 & 4.42 & 4.42 \\
1,2,4,5-Tetrazine & 3.17 & 3.17 & 1.72 & 1.72 & 2.10 & 2.15 & 0.9 & 1.20 & 0.32 & 2.38 \\ Methoxystyrene & 1.01 & - & - & 1.85 & 0.54 & 0.54 & 2.40 & - & - & 1.66 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: GC-MS results of corn stalk tar derived from MG and EG. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Name**} & \multicolumn{5}{c}{**Carbon Conversion (\(\eta_{c}\), \%)**} \\ \cline{2-9}  & **600 \({}^{\circ}\)C** & **700 \({}^{\circ}\)C** & **800 \({}^{\circ}\)C** & **900 \({}^{\circ}\)C** & **1000 \({}^{\circ}\)C** \\ \hline CS MG & 63.62 & 69.85 & 73.26 & 80.37 & 72.76 \\ CS EG & 57.13 & 61.35 & 68.56 & 72.65 & 79.78 \\ O MG & 72.68 & 75.27 & 77.69 & 78.13 & 83.18 \\ O EG & 63.26 & 66.92 & 69.97 & 78.56 & 80.53 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Carbon conversion from feedstock (\(\eta_{c}\), \%).