為了研究生質物於焙燒前處理後之熱裂解特性與機制，於本研究的第一部分使用熱裂解氣象層析質譜（Py-GC/MS）進行測試與分析生質物的三大基本組成物質:半纖維素(木聚醣)、纖維素、木質素，其熱裂解特性與焙燒前處理後熱裂解特性。第二部分探討橡膠木的基本特性:熱重分析、元素分析、纖維分析、近似分析、熱值分析，並且延伸第一部分的研究測試基礎，探討焙燒前處理之熱裂解橡膠木影響。
第一部分是利用熱裂解氣象層析質譜研究半纖維素，纖維素和木質素的熱降解特性。為了瞭解生質物在焙燒，熱裂解及焙燒前處理對熱裂解的影響，分別使用單階段和兩階段連續反應的技術進行。分析表明，半纖維素中所含的O-acetyl和pentose在焙燒過程中熱降解為acetic acid和furfural，因此在焙燒後的半纖維素進行熱裂解所產生的acetic acid和furfural的含量明顯降低。由於纖維素中的晶體結構，焙燒對纖維素的影響不明顯。當熱解溫度高於300℃時，纖維素開始分解並形成有機揮發性產物，並且熱解產物包括由單體單元之間的β-O-4糖苷鍵斷裂引起的各種脫水糖類的產生（主要產物為levoglucosan）。來自木質素焙燒的產物並不明顯，木質素的熱降解產物主要產出在400和500℃的熱解溫度下。在300℃焙燒對木質素的熱解具有顯著影響，並且烘焙過的木質素在熱裂解下芳香族化合物的產量會增加。
第二部分調查以橡膠木作為裂解的生質原料，研究橡膠木的基本特性(熱重分析、元素分析、纖維分析、近似分析、熱值分析)，探討橡膠木作為生質料應用於熱裂解的潛力。以第一部分研究為基礎，使用熱重分析儀(TG)以及熱裂解氣象層析質譜(pyrolysis–gas chromatography/mass spectrometry)進行橡膠木屑分析。透過熱裂解氣象層析質譜分析。焙燒溫度為200, 250和300 °C，時間為10分鐘，並將焙燒過後的橡膠木進行高溫熱裂解反應，裂解溫度為500 °C。橡膠木屑的熱裂解產物分佈結果顯示:在焙燒300°C下，半纖維素及木質素會進行降解，產生的主要產物為酯類、醛類以及酚類。經焙燒前處理過後，富氧化合物 (酸類、醛類) 減少，而碳水化合物增加。

With the depletion of fossil fuels and the growing concern for environmental protection, utilization of biomass resources has attracted increasing worldwide interest. To investigate the characteristics of biomass thermal degradation, the torrefaction pretreatment effect on pyrolysis of the three main biomass components (hemicellulose, lignin, cellulose) and rubber wood sawdust are tested and analyzed in the present study, which are divided into two parts. In the first part, the thermal degradation of three basic constituents in biomass is examined by use of Py-GC/MS, with a particular focus on the temperature dependence and production of different compounds. In the second part aimed to examine the effects of different torrefaction pretreatment temperatures on rubber wood sawdust pyrolysis characteristics.
The aim of the first study is to investigate the thermal degradation charcteristics of hemicellulose, cellulose, and lignin using pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS). To characterize the decompostion behaviors, torrefaction, pyrolysis, and their combination of the three constitutentsa are performed using a single-stage reaction and a double-shot technique, with emphasis on the influence of torrefaction on pyrolysis. The analysis suggests O-acetyl and pentose units contained in hemicellulose are thermally degraded into acetic acid and furfural in torrefaction, so the contents of acetic acid and furfural decrease significantly in the pyrolysis of torrefied hemicellulose. On account of the crystalline structure in the cellulose, the impact of torrefaction upon the cellulose is insignificant. The cellulose starts to decompose and form organic volatile products as the pyrolysis temperature is higher than 300 °C, and the pyrolytic products included various anhydrosugars (dominated by the levoglucosan) from the breakage of β-O-4 glycosidic bond between the monomer units. The products from the torrefaction of the lignin are not obvious, and they become remarkable at the pyrolysis temperatures of 400 and 500 °C, resulting from the depolymerization of the lignin. The torrefaction at 300 °C has a significant influence on the pyrolysis of the lignin, and the pyrolysis of the torrefied lignin results in an increase in the amount of aromatic compounds.
The aim of the second part research is to investigate the effect of torrefaction on the pyrolysis of rubber wood sawdust (RWS) using pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Three typical torrefaction temperatures (200, 250, and 300 °C) and pyrolysis temperatures (450, 500, and 550 °C) are considered. The results suggest that only diethyl phthalate, belonging to esters, is detected at the torrefaction temperatures of 200 and 250 °C, revealing hemicellulose degradation. With the torrefaction temperature of 300 °C, esters, aldehydes, and phenols are detected, suggesting the predominant decomposition of hemicellulose and lignin. The double-shot pyrolysis indicate that the contents of oxy-compounds such as acids and aldehydes in pyrolysis bio-oil decreased with rising torrefaction temperature, implying that increasing torrefaction severity abated oxygen content in the bio-oil. With the torrefaction temperature of 300 °C, relatively more cellulose is retained in the biomass because the carbohydrate content in the pyrolysis bio-oil increases significantly.

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