Abstract Two-staged pyrolysis of biomass was proposed as a promising method by which liquid products would be less diverse and more concentrated, and beneficial to further upgrading or extracting chemicals. Rice straw, cedar wood, and dalbergia wood were selected as representative biomass materials. Thermogravimetric Fourier-transform infrared spectroscopy (TG-FTIR) was initially used to analyze biomass and the three main components. According to the pyrolysis characteristics and the volatile release processes, 270–360°C was selected as the optional temperature range for the low-temperature stage of the two-staged pyrolysis. Then, Pyrolysis Gas Chromatography Mass Spectrometry (Py-GC/MS) was used in two stages to analyze three types of biomass, with the first stage at 270°C, 320°C, or 360°C and then the second stage at 550°C. The two-staged pyrolysis could efficiently separate biomass pyrolysis products, especially the enrichment of organic acids, alcohols, and aldehydes in the first stage, and the enrichment of phenolic substances in the second stage. The optimum temperature of the first stage was 320°C, which was suitable for three different kinds of biomass.

中文翻译：

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两段生物质热解产物分布的 Py-GC/MS 分析

摘要 生物质的两段热解被认为是一种很有前景的方法，通过该方法可以减少液体产品的多样性和浓度，有利于进一步升级或提取化学品。稻草、雪松木和降香木被选为代表性的生物质材料。热重傅里叶变换红外光谱 (TG-FTIR) 最初用于分析生物质和三个主要成分。根据热解特性和挥发物释放过程，选择270-360°C作为两段热解低温段的可选温度范围。然后，使用热解气相色谱质谱 (Py-GC/MS) 分两个阶段分析三种类型的生物质，第一阶段在 270°C、320°C 或 360°C，然后第二阶段在 550 ℃。两段热解能有效分离生物质热解产物，尤其是第一段有机酸、醇、醛的富集，第二段酚类物质的富集。第一阶段的最适温度为320℃，适用于三种不同的生物质。