Abstract Pyrolysis of biomass is an effective approach to produce high-value added solid, liquid and gaseous products. Wood vinegar (WV) is obtained as one of the main liquid products of biomass pyrolysis and has been used as the sustainable chemicals in agriculture. In this study, the effects of acid-base properties of chemical reagents on the biomass pyrolysis behavior and WV properties were investigated, and the mechanism was further discussed. The results indicated that acid-base properties of chemical reagents exhibited the significant effects on pyrolysis behavior and WV properties. Alkaline compounds showed the more obviously effects on changes in biomass chemical structure rather than acids, while acids removed the metallic species more efficiently than alkaline compounds. All chemical pretreatments increased the cellulose crystallinity, and the alkaline compounds were more favorable than the acidic compounds for increasing the crystallinity. Meanwhile, chemical pretreatments changed the chemical structure of biomass and promoted the pyrolysis process. All chemical pretreatments increased the organic content of WV. The relative content of phenols increased after all pretreatments, which increased more obviously by the acids pretreatments. Whereas, the relative content of acids decreased after pretreated by inorganic acids, and increased after pretreated by organic acids and alkaline compounds.

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全面了解化学预处理试剂的酸碱性质对生物质热解行为和木醋液性质的影响

摘要 生物质热解是生产高附加值固体、液体和气体产品的有效途径。木醋液 (WV) 是生物质热解的主要液体产品之一，已被用作农业中的可持续化学品。本研究研究了化学试剂的酸碱性质对生物质热解行为和WV性质的影响，并进一步探讨了其作用机制。结果表明，化学试剂的酸碱性质对热解行为和WV性质有显着影响。碱性化合物对生物质化学结构变化的影响比酸更明显，而酸比碱性化合物更有效地去除金属物种。所有化学预处理都增加了纤维素的结晶度，碱性化合物比酸性化合物更有利于提高结晶度。同时，化学预处理改变了生物质的化学结构，促进了热解过程。所有化学预处理都增加了 WV 的有机含量。酚类的相对含量在所有预处理后均有所增加，其中酸类预处理的增加更为明显。而无机酸预处理后酸的相对含量降低，有机酸和碱性化合物预处理后酸的相对含量增加。酚类的相对含量在所有预处理后均有所增加，其中酸类预处理的增加更为明显。而无机酸预处理后酸的相对含量降低，有机酸和碱性化合物预处理后酸的相对含量增加。酚类的相对含量在所有预处理后均有所增加，其中酸类预处理的增加更为明显。而无机酸预处理后酸的相对含量降低，有机酸和碱性化合物预处理后酸的相对含量增加。