Abstract The effect of coupling leaching with torrefaction pretreatment process on bio-oil production from catalytic fast pyrolysis using ZSM-5 zeolite catalyst was evaluated by Py-GC/MS. During coupling leaching with torrefaction pretreatment, the fuel characteristics and structural characteristics of rice husk samples were changed, which were evaluated using proximate, ultimate, and calorific analyses, Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometer (XRD) techniques. The experimental results of catalytic fast pyrolysis indicated that coupling leaching with torrefaction pretreatment further improved the relative contents of BTX (benzene, toluene and xylene) compounds in bio-oil compared to that of raw rice husk sample. It was mainly ascribed to the effective removal of metallic species during leaching process. In addition, the selective removal of hemicellulose fraction and the increasing lignin fraction and changes in the structure of lignin (cleavage of ether linkages and demethoxylation) during torrefaction process also plays positive roles. Severe torrefaction process resulted in the cross-linking and charring of sample, thus reducing the formation of BTX compounds. Thus, coupling leaching with middle torrefaction pretreatment process was the optimum pretreatment conditions for catalytic fast pyrolysis of rice husk samples.

中文翻译：

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稻壳催化快速热解：浸出与烘焙预处理的耦合作用

摘要 采用Py-GC/MS评价浸出与烘焙预处理联用对ZSM-5沸石催化剂催化快速热解制生物油的影响。在浸出与烘焙预处理的耦合过程中，稻壳样品的燃料特性和结构特性发生了变化，使用近似、极限和热量分析、傅里叶变换红外光谱 (FTIR) 和 X 射线衍射仪 (XRD) 技术对其进行了评估。催化快速热解实验结果表明，与生稻壳样品相比，浸出与烘焙预处理的耦合进一步提高了生物油中BTX（苯、甲苯和二甲苯）化合物的相对含量。这主要归因于浸出过程中金属物质的有效去除。此外，在烘焙过程中选择性去除半纤维素部分和增加的木质素部分以及木质素结构的变化（醚键断裂和去甲氧基化）也起到了积极的作用。严重的烘焙过程导致样品交联和炭化，从而减少了 BTX 化合物的形成。因此，浸出与中焙预处理工艺耦合是稻壳样品催化快速热解的最佳预处理条件。从而减少 BTX 化合物的形成。因此，浸出与中焙预处理工艺耦合是稻壳样品催化快速热解的最佳预处理条件。从而减少 BTX 化合物的形成。因此，浸出与中焙预处理工艺耦合是稻壳样品催化快速热解的最佳预处理条件。