生物乙醇制备航空煤油的研究进展

Research progress on the preparation of aviation kerosene using bioethanol

  • 摘要: 生物基航空煤油是一种可持续、绿色环保的航空燃料,能够有效降低航空业的碳排放,具有巨大的应用前景。本文对以生物质为原料制备航空煤油的工艺路线进行了综述,我国生物乙醇产业规模发展快速,产量充足,着重阐述了生物乙醇制备航油的工艺流程,对传统醇制航油技术(Alcohol to Jet Fuels)三个主要反应乙醇脱水制乙烯、烯烃低聚和加氢反应的工艺反应条件和催化剂进行分析总结,并介绍了乙醇碳碳偶联和加氢脱氧制备航空煤油技术,包括制备高碳醇的反应机理和催化剂以及对加氢脱氧反应的研究等,指出乙醇制备航空煤油工艺技术现阶段所面临的成本较高、制备新型催化剂等问题,针对该领域未来的发展方向提出展望,为今后生物乙醇制备航空煤油工业化发展提供参考。

     

    Abstract: In recent years, the Chinese government has put forward the "dual carbon" goal of achieving carbon peak by 2030 and carbon neutrality by 2060. In order to achieve this goal, the petrochemical industry is facing the urgent challenge of transformation and development, energy conservation and emission reduction. Bio-based aviation kerosene represents a sustainable and environmentally friendly alternative for reducing carbon emissions in the aviation industry, offering significant promise for widespread adoption. This paper provides a comprehensive review of the process for producing aviation kerosene from biomass. With the rapid development of China's bioethanol industry and abundant production, the energy supply diversification strategy represented by ethanol and other alternative energy sources has become a direction of energy policies in various countries. The use of bioethanol as a raw material for the preparation of aviation kerosene plays an important role in the environment, economy and sustainability. This paper focuses on the process of converting bioethanol into aviation fuel. The paper analyzes and summarizes the reaction conditions and catalysts involved in three main reactions: ethanol dehydration to ethylene, olefin oligomerization, and hydrogenation. At present, ATJ process still has some disadvantages such as long process flow and low conversion efficiency. The route from ethanol to jet kerosene is complex and requires three different catalysts. We need to develop a catalyst that can catalyze both dehydration reaction and oligomerization hydrogenation reaction, improve conversion efficiency and reduce production cost. Additionally, it introduces the carbon-carbon coupling of ethanol and hydrodeoxidation for aviation kerosene production, including discussions on reaction mechanisms and catalysts for high carbon alcohol preparation. In the Guerbet condensation reaction of ethanol, the presence of by-product water will hinder the reaction. Therefore, a catalyst for ethanol aqueous carbon-carbon coupling reaction to produce high-carbon alcohols was proposed. The catalyst with good water resistance can maintain its activity and selectivity in the presence of water, effectively inhibit the interference of water molecules, and thus improve the efficiency and stability of the catalytic reaction. Jet kerosene was obtained by hydrodeoxidation of high carbon alcohols, in which noble metal and molybdenum based catalysts had good catalytic performance. Transition metals combined with Mo2C catalysts can selectively break C-O bonds in polyols and avoid C-C bond breakage. Research and development of efficient hydrodeoxidation catalysts can promote the conversion of high-carbon alcohols to hydrocarbons, which provides important support for the development of alternative aviation fuels. The paper highlights current challenges in ethanol-based aviation kerosene production, such as high costs and the need for new catalysts. Furthermore, it proposes future development directions in this field, offering valuable insights for the industrialization of bioethanol-based aviation kerosene production.

     

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