# Improved Bio-Oil Quality from Pyrolysis of Pine Biomass in Presurized Hydrogen
## 3 Results and Discussion
### GC-MS Analysis of the Bio-Oil
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multicolumn{3}{c}{**Bio-Oil in Nitrogen**} & \multicolumn{3}{c}{**Bio-Oil in Hydrogen**} \\ \multicolumn{3}{c}{**Atmosphere**} & & & **Atmosphere** & \\ \hline
**Time/Min** & **Component** & **Peak Area \%** & **Time/Min** & **Component** & **Peak Area \%** \\ \hline
3.07 & Aceticacid, hydrazide & 9.91 & 3.24 & Toluene & 5.42 \\
3.18 & Butanoicacid, 2-methyl-, & 1.83 & 4.88 & Furfural & 1.05 \\
4.03 & 2-Pentanone, 4-hydroxy-4-methyl- & 0.48 & 5.64 & Ethylbenzene & 1.78 \\
4.79 & Styrene & 0.98 & 5.85 & Benzene, 1,3-dimethyl- & 1.89 \\
5.78 & dihydro-5-methyl- & 1.41 & 8.16 & Benzene, 1,2,3-trimethyl- & 1.11 \\
5.99 & 2-Cyclopenten-1-one, 3-methyl- & 0.36 & 8.77 & Phenol & 4.19 \\
6.15 & Phenol & 12.7 & 9.27 & Butanoicacid, anhydride & 0.96 \\
6.49 & 3-Phenyl-1-propanol, & 0.55 & 9.32 & Ethanol, 2,2-oxybis-, & 0.65 \\  & acetate & & & & 1,2-Cyclopentanedione, & \\
6.55 & Benzofuran & 0.83 & 9.76 & 3-methyl- & 1.01 \\
7.36 & Indene & 2.27 & 9.88 & Indane & 0.72 \\
7.40 & Phenol, 2-methyl- & 3.5 & 10.36 & Phenol, 2-methyl- & 1.83 \\
7.57 & Aceticacid, phenylester & 0.79 & 10.83 & Phenol, 3-methyl- & 3.96 \\
7.73 & Phenol, 2-methyl- & 6.79 & 11.09 & Phenol, 2-methoxy- & 3.09 \\
8.32 & Cinnamaldehyde & 0.58 & 11.42 & 3-Pentanol, 2,2,4,4-tetramethyl- & 0.51 \\  & 8.93 & Phenol, 2,3-dimethyl- & 1.4 & 12.33 & Lactacid, 2-methyl-, & 2.14 \\  & 9.06 & 1H-Indene, 3-methyl- & 0.47 & 12.37 & Phenol, 2,5-dimethyl- & 1.01 \\
9.63 & Azulene & 7.84 & 12.71 & Phenol, 4-ethyl- & 0.41 \\
9.85 & Benzofuran, 2,3-dihydro- & 1.03 & 12.76 & Phenol, 2,3-dimethyl- & 1.31 \\
9.98 & Benzofuran, 2,3-dihydro- & 0.69 & 13.10 & Naphthalene & 6.81 \\
11.28 & Naphthalene, 1-methyl- & 1.97 & 13.24 & Creosol & 2.87 \\
11.54 & & undeca-1,3,5,7,9-pentae & 2.8 & 13.42 & Catechol & 2.59 \\
12.35 & 1,2-Benzenediol, diacetate & 0.49 & 14.90 & Phenol, 4-ethyl-2-methoxy- & 1.79 \\
12.45 & Biphenyl & 0.55 & 15.12 & 1,2-Benzenediol, 4-methyl- & 1.2 \\
13.01 & Naphthalene, 1,3-dimethyl- & 0.36 & 15.23 & Naphthalene, 2-methyl- & 1.54 \\
13.14 & Acenaphhene & 1.25 & 15.54 & Naphthalene, 2-methyl- & 0.66 \\
13.44 & Biphenylene & 2.52 & 16.50 & Phenol, 2-methoxy-4-propyl- & 0.52 \\
15.07 & Hexane, 3,3-dimethyl- & 0.52 & 16.75 & Biphenyl & 0.87 \\
15.12 & Fluorene & 0.61 & 17.92 & trans-Isoeugenol & 0.76 \\
15.64 & Fluorene & 0.37 & 20.17 & Fluorene & 1.52 \\
17.42 & Anthracene & 2.34 & 23.12 & Anthracene & 2.11 \\
17.53 & 9H-Fluorene, 9-methylene- & 0.63 & 25.34 & n-Hexadecanoicacid & 1.14 \\  & & & & Hexadecanoicacid, & 19.1 \\
19.12 & 1,2-Benzenedicarboxylicacid & 0.29 & 25.80 & ethylester & 19.1 \\
20.54 & Fluoranthene & 0.28 & 27.78 & Octadecanoicacid & 0.51 \\
20.84 & Fluoranthene & 0.51 & 28.19 & Octadecanoicacid, 17-methyl-, & 15.46 \\  & & & & methyl & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Composition of bio- oils in different atmospheres. tively. Therefore, the pyrolysis bio-oil prepared via hydrop pyrolysis has a certain industrial value. Generally, it is not economically feasible to recover such compounds because of the difficulty of separating such compounds from bio-oil. Accordingly, an economical and effective method will be developed to separate and recover these compounds in the next experiment for an acceptable production cost in the current market. Table 2 shows that the first three kinds of pyrolysis bio-oil with high peak area under nitrogen atmosphere are phenol, 2-methylphenol, and azulene, but the same substances also appear in pyrolysis bio-oil under hydrogen atmosphere, and the peak area at the corresponding time decreases. The peak area percentage of phenol decreased by 68.34% from 12.73% to 4.03%, the peak area percentage of 2-methylphenol decreased by 84.68% from 6.79% to 1.04%, and the peak area percentage of azulene decreased by 42.60% from 7.84% to 4.50%. The top three peak area percentages of pyrolysis bio-oil in hydrogen atmosphere are methyl octadecanoate (15.42%), ethyl cetate (19.1%), and toluene (9.04%).