基于EPR检测技术的香兰素热解机理研究

采用香兰素为木质素模型化合物,结合电子顺磁共振技术（EPR）以检测其热解反应的中间产物,通过确定中间产物的变化规律论证香兰素的热解机理及热解的反应路径。结果表明,对于香兰素而言,原位检测得到结焦中间产物的前驱体和一大部分稳定的碳自由基,而冷阱-捕获到的自由基主要为苯甲酰自由基、甲基自由基、OH自由基和H自由基。证明了香兰素的热解反应过程中存在自由基反应,同时也确认并提出了香兰素热解的反应路径。

Study on the Pyrolysis Mechanism of Vanillin Based on EPR Detection Technology

By using vanillin as a lignin model compound, electron paramagnetic resonance (EPR) was applied to detect the intermediate products of its pyrolysis reaction, so as to demonstrate the mechanism and reaction path by determining the changes of intermediate products. Results showed that, for vanillin, the precursors of coking intermediates and a large part of the stable carbon free radicals were detected in situ, while the free radicals captured by cold trap-captured were mainly benzoyl radicals, methyl radicals, OH radicals, and H radicals. It was proved that the pyrolysis reaction of vanillin was a free radical reaction, and the reaction path of vanillin pyrolysis was also confirmed and proposed.