Nitrogen dioxide interface reaction

II) Solid-phase reaction zone Nitrogen dioxide and aldehydes are produced in the thermal degradation process. This reaction process occurs endothermically in the solid phase and/or at the burning surface. The interface between the solid phase and the burning surface is composed of a solid/gas and/or soUd/Uquid/gas thin layer. The nitrogen dioxide fraction exothermically oxidizes the aldehydes at the interface layer. Thus, the overall reaction in the solid-phase reaction zone appears to be exothermic. The thickness of the solid-phase reaction zone is very small, and so the temperature is approximately equal to the burning surface temperature, T. ... 

Carbon dioxide gas diluted with nitrogen is passed continuously across the surface of an agitated aqueous lime solution. Clouds of crystals first appear just beneath the gas-liquid interface, although soon disperse into the bulk liquid phase. This indicates that crystallization occurs predominantly at the gas-liquid interface due to the localized high supersaturation produced by the mass transfer limited chemical reaction. The transient mean size of crystals obtained as a function of agitation rate is shown in Figure 8.16. 

CdCN2 decomposed [68] in vacuum within the interval 865 and 989 K to yield metal, cyanogen and nitrogen E = 159 kJ mol ) for which the ur-time exudes were fitted by the contracting volume equation. The reaction in oxygen, which formed metal oxide, nitrogen and carbon dioxide = 82 kJ mol ) followed the same kinetic model and both reactions are believed to proceed by an interface advance mechanism. 

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