项目名称: 基于同步辐射光电离的热重/分子束质谱用于生物质的热解研究
项目编号: No.11305175
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 数理科学和化学
项目作者: 周忠岳
作者单位: 中国科学技术大学
项目金额: 30万元
中文摘要: 研究生物质的热解机理对生物质燃料的转化效率和品质优化具有重要意义,事关我国能源、环境等领域的需求。 热重技术是研究生物质热解机理的重要手段,其特点是定量性强。热重通常通过毛细管与光谱、色谱、质谱等相联,实现对热解产物的定性分析。在毛细管中,活泼物种极易淬灭,稳定组分容易凝结,这极大限制了检测的准确性和全面性。分子束取样技术能有效降低分子间的碰撞几率,有利于活性组分的探测,并具有极高的灵敏度。借助同步辐射真空紫外光电离质谱,可以增强电离选择性,有效减少电离碎片,并能区分同分异构体。 本项目拟发展一种基于同步辐射真空紫外光电离技术新方法,通过分子束取样技术将热重技术与光电离质谱相结合,用于研究生物质的热解过程。在定性方面,检测热解产物中的活性组分、区分同分异构体;在定量方面,测量各种反应物、中间物和产物的浓度等信息。基于准确、全面的实验研究,发展更加实用、可靠的生物质热解机理。
中文关键词: 热重;分子束质谱;原位分析;光电离;同步辐射
英文摘要: Study of the pyrolysis kinetics of biomass is significant for improving the transformation efficiency and quality of bio-fuel, which involving the nation's demand related to energy, environment, etc. Thermogravimetry (TG), featured by high quantitative capability, is an important method for studying pyrolysis kinetics of biomass. In able to analyze pyrolysis products qualitatively, the thermal analysis instruments are usually coupled with spectroscopy, gas chromatography, mass spectrometry by capillaries. However, the quenching of reactive species and condensation of stable components in capillaries limit the accuracy of detection. Molecular-beam sampling is a high sensitive technique, and few molecule collisions during the sampling process facilitate the detection of reactive species. With the combination of synchrotron vacuum ultraviolet (VUV) photoionization technique, pyrolysis diagnostic will benefit from ionization-selective, fragment-free and isomer-distinguishable capabilities. We will develop a TG/molecular-beam mass spectrometry (MBMS) based on synchrotron VUV photoionization technique, and this diagnostic method will be used for the study of biomass pyrolysis. With this facility, reactive species can be detected qualitatively, isomers can be distinguished easily, and concentrations of all kinds of p
英文关键词: Thermogravimetry;Molecular-beam mass spectrometry;in-situ analysis;Photoionization;Synchrotron radiation