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Heterogeneous CO_2 Evolution from Oxidation of Aromatic Carbon-Based Materials

机译:芳香碳基材料氧化产生的非均质CO_2

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摘要

Carbon dioxide is one of the main gaseous products in oxidation of carbonaceous materials via both homogeneous and heterogeneous reactions. However, the mechanisms of heterogeneous CO_2 evolution during oxidation of aromatic carbon-based materials are not known in detail. Using density functional theory, a new oxidation mechanism of aromatic hydrocarbons with atomic oxygen was suggested to consist of four main steps, namely, (1) adsorption of oxygen atom, (2) insertion of O atom into the ring, (3) rearrangement to form a five-membered ring and four-membered ring lactone group, and (4) desorption of CO_2. Using naphthoxy radical as a model system, the proposed reaction pathway can explain how some of the experimentally observed CO_2 is formed.
机译:二氧化碳是通过均相和非均相反应氧化碳质材料的主要气体产物之一。然而,在芳香族碳基材料氧化过程中非均质CO_2释放的机理尚不清楚。利用密度泛函理论,提出了一种新的芳烃与原子氧的氧化机理,包括四个主要步骤,即(1)吸附氧原子,(2)将O原子插入环中,(3)重排成环形成五元环和四元环内酯基团,(4)CO_2的解吸。使用萘氧基自由基作为模型系统,提出的反应路径可以解释如何形成一些实验观察到的CO_2。

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