Abstract The conversion of lignin into light olefins and aromatic compounds via catalytic fast pyrolysis was performed in a fixed bed reactor over a range of Fe-modified ZSM-5 catalysts at different temperatures. More specifically, catalysts containing 0, 1, 3, 6, and 9 wt.% Fe were prepared by an impregnation method, and the resulting catalysts were characterized by XRD, NH3-TPD, H2-TPR and BET analysis. The catalyst structure remained intact upon increasing the Fe loading, although the surface area, pore volume, and number of acidic sites of the catalysts varied, and the total acidity increased upon increasing the Fe loading. The maximum carbon yield of light olefins plus aromatic compounds was 12.8%, and this was obtained with a 3 wt.% Fe loading at 600 °C. This yield decreased upon further increasing the Fe loading and upon increasing the temperature to 700 °C. Moreover, the selectivity of C2H4 was more than 80%, and it was decreased with the Fe loading and increased with temperature increasing. The total acidity had a direct relationship with aromatic production, while light olefins were mainly affected by medium acid sites.

中文翻译：

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通过 Fe/ZSM-5 催化快速热解将木质素转化为轻质烯烃和芳烃：Fe 含量和温度的意义

摘要 在固定床反应器中，使用一系列 Fe 改性 ZSM-5 催化剂在不同温度下通过催化快速热解将木质素转化为轻质烯烃和芳族化合物。更具体地说，通过浸渍法制备含有 0、1、3、6 和 9 wt.% Fe 的催化剂，并通过 XRD、NH3-TPD、H2-TPR 和 BET 分析表征所得催化剂。尽管催化剂的表面积、孔体积和酸性位点数量发生变化，但随着 Fe 负载量的增加，总酸度增加，但随着 Fe 负载量的增加，催化剂结构保持不变。轻质烯烃加芳香族化合物的最大碳产率为 12.8%，这是在 600 °C 下以 3 wt.% Fe 负载量获得的。在进一步增加 Fe 负载量和将温度增加到 700 °C 时，该产率降低。此外，C2H4 的选择性超过 80%，且随 Fe 负载量的增加而降低，随温度的升高而增加。总酸度与芳烃产量有直接关系，而轻烯烃则主要受中酸位的影响。