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• W4313255257 abstract "Carbonaceous surface, as one of the major carriers in coal combustion, was found to exert great influence on the nitric oxide with carbon monoxide (NO–CO) reaction. Although there have been some studies addressing the NO–CO reaction, the inherent mechanism remains obscure. In this work, some updated mechanisms with details were proposed at the electronic level. Using density functional theory calculations, the preferred pathways were identified with three channels consisting of homogeneous, Eley–Rideal (E-R), and Langmuir–Hinshelwood (L–H) heterogeneous reactions. The reasons for the difference in energy barrier among the three mechanisms were revealed by analyzing the chemical bond and electronic transfer. Results show that among these channels, the NO–CO reaction is more likely to occur along the E-R mechanism, due to its lower energy barrier of the rate-determining step. Compared to the L–H mechanism, there is a higher degree of electronic localization between NO molecules at the initial stage of the E-R mechanism. As a result, the NO dimer formation of the E-R mechanism has a lower energy barrier than that of the L–H mechanism. Meanwhile, a large number of electrons floods into the N–N, N–O, and O–O bonds of NO dimer in the homogeneous reaction, which certainly gets more difficult for the dissociation of O atoms in the gas phase. Accordingly, the following stage of N2 formation in the homogeneous reaction has a higher energy barrier than that in both the E-R and L–H reactions. Compared to the L–H mechanism, the E-R mechanism exhibits a lower degree of electronic localization between N2O and carbonaceous surface, suggesting that the interfacial interaction in the E-R mechanism is weaker. As a result, N2 is easier to remove from the carbonaceous surface in the E-R mechanism than in the L–H mechanism. To sum up, the results deepen the knowledge about the NO–CO reaction, which will help to further develop the oxy-fuel combustion technology." @default.
• W4313255257 created "2023-01-06" @default.
• W4313255257 creator A5017975088 @default.
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• W4313255257 date "2022-12-29" @default.
• W4313255257 modified "2023-10-02" @default.
• W4313255257 title "A new insight on the NO–CO reaction at the electronic level: homogeneous, E-R, and L–H mechanisms" @default.
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• W4313255257 doi "https://doi.org/10.1007/s00894-022-05416-0" @default.
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