在生物质热解中引入CH4、H2、CO2、CO等活性气体有利于调控优化热解产物分布、提升生物油品质。然而，有关活性气体作用下生物质热解机理方面的研究还相当缺乏。为了进一步指导优化热解转化技术的开发，本项目拟深入研究活性气体对生物质热解构和二次反应的影响机理。通过对热解过程中生物质结构演变过程的原位示踪和自由基等活性中间产物的在线监测，结合热解产物的定量检测和反应过程的密度泛函理论计算，构建活性气氛下的生物质热解反应网络。在此基础上，进一步探索活性气体对生物质热解目标产物的调控规律，明晰多种活性气体对生物质热解过程中含氧官能团的耦合作用机制，为生物质热解理论体系的完善和技术的优化奠定基础。

Biomass pyrolysis under active gases such as CH4、H2、CO2、CO has potential to optimize the product distribution and improve the quality of bio-oil. However, there was few knowledge on the reaction mechanism of biomass pyrolysis under these reactive atmospheres. With aim to provide guidance for pyrolysis process optimization and development, experiments will be conducted on both micro-scale and lab-scale mechanism reactors to obtain a deep understanding how the reactive atmosphere affect pyrolysis process. The change of biomass structure and evolution of radical intermediates will be monitored online. The distribution and characteristics of pyrolysis products under reactive atmosphere will also be quantified. The pyrolysis reaction network will be constructed by combing these experimental results and quantum chemical calculations using density functional theory. The mechanism of pyrolysis product optimization by reactive gases will be further explored. The deoxygenation pathways under reactive gases in the process will also be discussed. The goal of this project is to improve the pyrolysis mechanism and technology development.