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首页> 外文期刊>Catalysis science & technology >Correlating lignin structure to aromatic products in the catalytic fast pyrolysis of lignin model compounds containing β-O-4 linkages
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Correlating lignin structure to aromatic products in the catalytic fast pyrolysis of lignin model compounds containing β-O-4 linkages

机译：将木质素结构与含有β-O-4链接的木质素模型化合物的催化快速热解相关的芳族产物

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Lignin model compounds, phenethoxybenzene, 1-methoxy-2-phenethoxybenzene, and 1-phenethoxy-4-propylbenzene were reacted over various zeolites in the vapor phase at 600 °C to elucidate the role of the zeolite type during the catalytic fast pyrolysis (CFP) of molecules containing β-O-4 linkages. The goal was to determine how different zeolites including hierarchical zeolites upgrade lignin fragments, ultimately for converting the lignin portion of lignocellulosic biomass to chemicals or fuels. Using three different catalysts, HZSM-5, H-beta, and HY, the model lignin compounds were upgraded by catalytic fast pyrolysis at 600 °C. The total acidity or Bronsted acidity of the catalysts were held similar when comparing the three different zeolite types to understand the role of each zeolite on the product distribution. The optimal catalyst for the production of benzene from all three model compounds was H-beta, but the least amount of coke was produced with HZSM-5. Compared with the analogous microporous HZSM-5 catalyst, the hierarchical materials resulted in increased liquid carbon molar yields. Although H-beta produced the highest amount of benzene with 1-methoxy-2-phenethoxybenzene, HZSM-5 was able to produce more liquid products from this model lignin fragment. To analyze the catalysts with intact model compounds, vaporization studies were conducted to prevent the thermal cleavage of the C_β-O bond in the β-O-4 linkages. These vaporization studies resulted in lower liquid yields and higher coke yields. Thus, it is important for CFP to generate fragments of the β-O-4 linkages before catalyst interaction, and catalyst selection for the conversion of lignin should greatly depend on feed compositions.
机译：木质素模型化合物，苯乙氧基苯，1-甲氧基-2-苯氧苯苯苯和1-苯甲氧基-4-丙酰苯在600°C下在蒸气阶段的各种沸石进行反应，以阐明Zeolite类型在催化快速pylopy plasty typer pastaliete的作用（C cfsality）的作用（C ）包含β-O-4链接的分子。目的是确定包括分层沸石在内的不同沸石升级木质素片段，最终是为了将木质纤维素生物量的木质素部分转化为化学物质或燃料。使用三种不同的催化剂，即HZSM-5，H-BETA和HY，模型木质素化合物在600°C下通过催化快速热解升级。在比较三种不同的沸石类型时，催化剂的总酸度或布朗斯特酸度相似，以了解每种沸石在产物分布中的作用。从所有三种模型化合物中生产苯的最佳催化剂是H-beta，但用HZSM-5生产的焦炭量最少。与类似的微孔HZSM-5催化剂相比，分层材料导致液态碳摩尔产量增加。尽管H-beta用1-甲氧基-2-苯氧苯苯苯苯二苯量最高，但HZSM-5能够从该模型木质素片段中产生更多的液体产物。为了分析具有完整模型化合物的催化剂，进行了蒸发研究，以防止β-O-4链接中C_β-O键的热裂解。这些汽化研究导致液态产量较低和焦炭产量较高。因此，对于CFP而言，重要的是在催化剂相互作用之前生成β-O-4链接的片段，而木质素转化的催化剂选择应在很大程度上取决于饲料组成。

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