In this study, three type of pretreatment methods (single pretreatment of leaching, single pretreatment of torrefaction, combined pretreatment of leaching and torrefaction) were employed to improve the quality of rice straw. Three leaching agents, namely acid solution, phenol solution, and simulated light bio-oil (SBO), were used. Then, in order to obtain higher yield of benzene, toluene, and xylene (BTX), the pretreated biomass was pyrolyzed using Py-GC/MS. Effects of combined pretreatment (leaching and torrefaction) and shape selective catalytic fast pyrolysis (SS-CFP) on the production of aromatics were investigated. Results showed that the combined pretreatments have advantages of the separate pretreatments, that is, deashing and deoxygenation. Synergistic effect was found between acids and phenols in SBO with respect to the removal of alkali and alkaline earth metal species (AAEMs) from rice straw. This promotes the generation of volatile substances, which are upgraded to produce BTX under catalysis of HZSM-5. Among the pretreated samples, torrefied–leached samples have the highest selectivity for BTX (64.6%). In conclusion, combined pretreatment of leaching and torrefaction was more effective to improve the yield of BTX than the single pretreatment of leaching or torrefaction.

中文翻译：

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浸出与烘焙联合预处理对稻草择形催化快速热解生产生物芳烃的影响

本研究采用单一浸出预处理、单一烘焙预处理、浸出与烘焙联合预处理三种预处理方法来提高稻草品质。使用酸溶液、苯酚溶液和模拟轻质生物油（SBO）三种浸出剂。然后，为了获得更高产率的苯、甲苯和二甲苯（BTX），使用Py-GC/MS对预处理的生物质进行热解。研究了联合预处理（浸出和烘焙）和择形催化快速热解（SS-CFP）对芳烃生产的影响。结果表明，联合预处理具有脱灰、脱氧单独预处理的优点。在去除稻草中的碱金属和碱土金属物质 (AAEM) 方面，SBO 中的酸和酚之间存在协同效应。这促进了挥发性物质的产生，这些物质在HZSM-5的催化下升级为BTX。在预处理的样品中，烘焙浸出样品对 BTX 的选择性最高（64.6%）。综上所述，浸出和烘焙联合预处理比浸出或烘焙单独预处理更能有效提高BTX得率。