On-line composition analysis of complex hydrocarbon mixtures is highly desirable to determine the composition of process streams and to study chemical reactions in heterogeneous catalysis. Here, we show how the combination of time-resolved Fourier transform infrared spectroscopy and ion–molecule-reaction mass spectrometry (IMR-MS) can be used for compositional analysis of processed plant biomass streams. The method is based on the biomass-derived model compound 2,5-dimethylfuran and its potential catalytic conversion to valuable green aromatics, for example, benzene, toluene, and xylenes (BTX) over zeolite β. Numerous conversion products can be determined and quantified simultaneously in a temporal resolution of 4 min^–1 without separation of individual compounds. The realization of this method enables us to study activity, selectivity, and changes in composition under transient reaction conditions. For example, increasing isomerization of 2,5-dimethylfuran to 2,4-dimethylfuran, 2-methyl-2-cyclopenten-1-one, and 2-methyl-2-cyclopenten-1-one is observed as the catalyst is exposed to the reactant, while BTX and olefin formation is decreasing.

中文翻译：

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通过时间分辨傅立叶变换红外光谱和离子-分子反应质谱法对复杂烃流进行在线成分分析

复杂烃混合物的在线成分分析对于确定工艺流的成分和研究多相催化中的化学反应是非常理想的。在这里，我们展示了时间分辨傅立叶变换红外光谱和离子-分子反应质谱 (IMR-MS) 的组合如何用于加工植物生物质流的成分分析。该方法基于生物质衍生的模型化合物 2,5-二甲基呋喃及其在沸石 β 上催化转化为有价值的绿色芳烃，例如苯、甲苯和二甲苯 (BTX) 的潜力。可以在 4 min ^–1的时间分辨率下同时测定和量化多种转化产物无需分离单个化合物。这种方法的实现使我们能够研究瞬态反应条件下的活性、选择性和组成的变化。例如，观察到 2,5-二甲基呋喃异构化为 2,4-二甲基呋喃、2-甲基-2-环戊烯-1-酮和 2-甲基-2-环戊烯-1-酮，因为催化剂暴露于反应物，而 BTX 和烯烃的形成正在减少。