Synergistic effects of torrefaction pretreatment and Mg-Al modified HZSM-5 catalysts on the components distribution in the bio-oils from camphor wood pyrolysis.docx

The pyrolysis temperature was 450℃. The torrefaction temperature was 200℃. The catalysts were HZSM-5, MgO-modified HZSM-5, and Al₂O₃-modified HZSM-5, respectively. The bio-oil contained various high-value chemicals, such as phenols, aldehydes, sugars, ketones, hydrocarbons, alcohols, and lipids. The content of phenols in bio-oil was the highest among all the chemical components. The content of phenols was the highest at pyrolysis temperature of 450℃ and torrefaction temperature of 200℃, leading to a content of 31.46%. The torrafaction pretreatment and catalysts could all improve the production of the aldehydes. The content of sugars reached the highest using HZSM-5 as the catalyst, 10.38%. The Al₂O₃-modified HZSM proved the content of ketones. The content of lipids was lower than the other six compounds, and the content of lipids was highest at high temperatures (4.27%).

本次实验的热解温度为450℃，烘焙预处理（torrefaction）温度为200℃。所使用的催化剂分别为HZSM-5、氧化镁改性HZSM-5（MgO-modified HZSM-5）以及三氧化二铝改性HZSM-5（Al₂O₃-modified HZSM-5）。所得生物油含有多种高附加值化学品，包括酚类、醛类、糖类、酮类、烃类、醇类以及脂类。在所有化学成分中，生物油内酚类的占比最高；当热解温度为450℃、烘焙预处理温度为200℃时，酚类占比达到峰值，为31.46%。烘焙预处理与催化剂均可提升醛类的生成量。以HZSM-5作为催化剂时，糖类的占比达到最高，为10.38%。三氧化二铝改性HZSM-5可提升酮类的占比。脂类的占比低于其余六种化学成分，且在高温条件下脂类占比达到峰值，为4.27%。