Pinewood particles were pyrolyzed in a vertical tube furnace at 500 °C followed by the upgradation of pyrolysis vapors using zeolite ZSM-5 at catalyst temperature from 400 to 600 °C. The catalyst was later regenerated to recover its acidity and activity. The bio-oil before catalysis was homogeneous and highly oxygenated, and neither aromatic nor polycyclic aromatic hydrocarbons (PAHs) were detected. The difference in water yield was very small for different catalytic pyrolysis cases, and experimental results indicated that the conversion of oxygen was mainly to CO and CO₂ as the catalyst temperature increased. Chemical analysis of the bio-oil showed that aromatic hydrocarbons and PAH were formed in significant amounts upon catalytic treatment. Finally, the content of acids and ketones was reduced after catalysis, showing an improvement in the quality of bio-oil. The overall effect of the usage of regenerated catalyst on the pyrolysis products was not significant in the current study.

中文翻译：

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厘米级松木颗粒催化热解制备烃类燃料：催化剂温度和再生的影响

松木颗粒在垂直管式炉中在500°C的温度下热解，然后使用ZSM-5沸石在400至600°C的催化剂温度下热解蒸气的升级。催化剂随后再生以恢复其酸度和活性。催化之前的生物油是均质的且被高度氧化，因此未检测到芳烃或多环芳烃（PAH）。在不同的催化热解情况下，水的产率差异很小，实验结果表明，氧的转化主要是向CO和CO ₂转化。随着催化剂温度的升高。生物油的化学分析表明，催化处理后会大量形成芳烃和PAH。最终，催化后酸和酮的含量降低，表明生物油的质量得到改善。在当前的研究中，使用再生催化剂对热解产物的总体影响并不显着。