Kinetic study of the nitric oxide oxidation between 288 and 323 K, under pressure, focus on the oxygen influence on the reaction rate constant

Abstract

The sequestration of carbon dioxide fumes from oxyfuel combustion is used to reduce significantly the carbon dioxide emissions from coal‐fired power plants. Impurities like nitric oxide, present in the fumes, can cause technical difficulties during the capture, the treatment, the transport, and the storage steps of the CO2 fumes. The purpose of this study is to better understand the oxidation of nitric oxide under pressure in the presence of carbon dioxide and in the experimental condition of flue gas treatment. This reaction is known to be a third‐order reaction, two order in nitric oxide and first order in oxygen. To examine the effect of the temperature, the pressure and the volume fraction of oxygen on the rate constant of oxidation, k1, an autoclave is used. The first experiment studies the influence of the temperature between 288 and 323 K. The results found are in the form of an Arrhenius‐type equation: k1 = 810 exp(620/T) and are in agreement with the literature. Carbon dioxide does not seem to have an influence on the rate constant, whereas our experimental measurements indicate an influence of the volume fraction of oxygen. The rate constant decreases when the oxygen volume fraction increases by up to 10%. Then the rate constant remains constant. This observation allows us to conclude that the mechanism involving the mechanism with a dimer of NO as an intermediate is more likely to be the mechanism involved in the nitric oxide oxidation in our experimental conditions: high pressure and ambient temperature. The rate constant k2, k–2, and k3 were also estimated in these conditions.

Chemical and Phase Equilibria in the Reaction between NO and O2 in the Presence of Water and CO2 at 298.15 K up to 3 MPa

“…with k 0 = 1200 L 2 mol −2 s −1 and −E A /R = 530 ± 400 K. This reaction has been studied on the same equipment, in the same condition of pressure and temperature and without water in a previous paper. 16 The results obtained in this study are close to the values recommended by Atkinson.…”

Selective hydrogenation of α‐pinene on a nickel supported aluminophosphate catalyst: Process optimization and reaction kinetics

“…Their study reported that the selectivity of cis ‐pinane was more than 96.5%, and the catalyst can be reused eight times. Kinetic research is another effective way to improve the performance of the catalyst because it helps understand the progress of the reaction 12 and theoretically guides the optimization process 13 . Recently, microkinetics has become popular owing to their advantages in complex reaction networks 14 .…”

“…Kinetic research is another effective way to improve the performance of the catalyst because it helps understand the progress of the reaction 12 and theoretically guides the optimization process. 13 Recently, microkinetics has become popular owing to their advantages in complex reaction networks. 14 Grilc and coworkers [15][16][17] used a microkinetic model to investigate the effects of supported catalysts on the hydrogenation and hydrodeoxygenation of the lignin-derived model compound eugenol.…”

Combustion Chemistry of Unsaturated Hydrocarbons Mixed with NOx: A Review with a Focus on Their Interactions

“…which involves the formation of a dimer from two NO molecules. The dimer further reacts with O 2 to form two NO 2 molecules[117]. Although Mech 2 was included in the Konnov model and the CRECK model, some preliminary kinetic analyses (whose results will be included in a forthcoming publication from the authors' group) have indicated that the NO to NO 2 conversion around room temperature is still dominated by NO + NO + O 2 = NO 2 + NO 2 .…”