Catalytic pyrolysis of wheat straw based on dual catalyst CaO/ZSM-5 with acid washing and torrefaction pretreatment to enhance aromatic yield in bio-oils

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Journal of The Energy Institute Pub Date : 2024-09-19 DOI:10.1016/j.joei.2024.101836
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Abstract

In this paper, the catalytic pyrolysis integrating combined pretreatment (acid washing and torrefaction) and dual catalysts was adopted to improve the quality of bio-oil and the selectivity of aromatic hydrocarbons. Combined pretreatment is a highly effective method to improve the quality of biomass feedstock. It was capable of the removal of alkali and alkaline earth metals from wheat straw, with a K removal rate of 97.79 %. Under the combined pretreatment, the aromatic hydrocarbon content in bio-oil increased to 68.8 % using the ZSM-5 catalyst alone. Compared with ZSM-5, CaO could remove part of the oxygenated functional groups and had a better acid removal effect, but the aromatic hydrocarbon yield was low to 7.95 %. After combined pretreatment using simulated aqueous phase bio-oil for acid washing, catalytic pyrolysis using CaO/ZSM-5 dual catalysts greatly enhanced the quality of the bio-oil. The oxygenated compounds content was reduced to 17.58 %, and the total hydrocarbon yield was increased to 82.42 %, especially the aromatic hydrocarbons yield was increased to 79.91 %, of which the monocyclic aromatic hydrocarbons were as high as 68.38 %, and the benzene, toluene, and xylene content reaching 49.39 %. Thus, integrating dual catalysts (CaO/ZSM-5) with combined pretreatment can effectively increase the aromatic yield for producing high-quality bio-oil.
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基于 CaO/ZSM-5 双催化剂的小麦秸秆催化热解与酸洗和预处理以提高生物油中的芳烃产量
本文采用联合预处理(酸洗和高温分解)和双催化剂的催化热解方法来提高生物油的质量和芳香烃的选择性。联合预处理是提高生物质原料质量的一种高效方法。它能够去除小麦秸秆中的碱金属和碱土金属,钾的去除率为 97.79%。在联合预处理中,单独使用 ZSM-5 催化剂,生物油中的芳香烃含量增加到 68.8%。与 ZSM-5 相比,CaO 可以去除部分含氧官能团,脱酸效果更好,但芳烃产率较低,仅为 7.95%。在使用模拟水相生物油进行酸洗的联合预处理后,使用 CaO/ZSM-5 双催化剂进行催化热解可大大提高生物油的质量。含氧化合物含量降低到 17.58%,总烃收率提高到 82.42%,尤其是芳香烃收率提高到 79.91%,其中单环芳香烃高达 68.38%,苯、甲苯和二甲苯含量达到 49.39%。因此,将双催化剂(CaO/ZSM-5)与联合预处理相结合,可有效提高生产优质生物油的芳烃产率。
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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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