Rate constant for the NH3 + NO2 → NH2 + HONO reaction: Comparison of kinetically modeled and predicted results

Thaxton, A. Grant; Hsu, C.‐C.; Lin, M. C.

doi:10.1002/(sici)1097-4601(1997)29:4<245::aid-kin2>3.3.co;2-z

Cited by 2 publications

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“…The NH 3 + NO x reactions have been well studied over the past decades [80][81][82][83][84][85][86][87][88][89]. It was found that the species-concentration profiles in the reaction system NH 3 + NO 2 exhibit two different regions with increasing reaction temperature [84,89].…”

Section: Dark Zones In Adn Combustionmentioning

confidence: 63%

“…Thus, NO accumulation may cause the reduction of NH 2 radicals and affect the propagation of chain reactions. The experimental data of Bedford and Thomas [82] and the calculations by Thaxton et al [83] showed that addition of NO significantly decreased the rate of NO 2 decay. Note.…”

Section: Dark Zones In Adn Combustionmentioning

confidence: 69%

“…NO x reduction by NH 3 was most sensitive to NH 2 radicals. NO produced by the reaction between NH 3 and NO 2 has a tendency to inhibit the reaction system by destroying NH 2 radicals and forming stable N 2 and H 2 O species [80][81][82][83]. Thus, NO accumulation may cause the reduction of NH 2 radicals and affect the propagation of chain reactions.…”

Section: Dark Zones In Adn Combustionmentioning

confidence: 94%

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Thermal Decomposition and Combustion of Ammonium Dinitramide (Review)

Yang

Thakre

Yang

2005

Combust Explos Shock Waves

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A comprehensive review of thermal decomposition and combustion of ammonium dinitramide (ADN) has been conducted. The basic thermal properties, chemical pathways, and reaction products in both the condensed and gas phases are analyzed over a broad range of ambient conditions. Detailed combustion-wave structures and burning-rate characteristics are discussed. Prominent features of ADN combustion are identified and compared with other types of energetic materials. In particular, the influence of various condensed-and gas-phase processes in dictating the pressure and temperature sensitivities of the burning rate is examined. In the condensed phase, decomposition proceeds through the mechanisms ADN → NH 4 NO 3 + N 2 O and ADN → NH 3 + HNO 3 + N 2 O, the former mechanism being the basic one. In the gas phase, the mechanisms ADN → NH 3 + HDN and ADN → NH 3 + HNO 3 + N 2 O are prevalent. The gas-phase combustion-wave structure in the range of 5-20 atm consists of a near-surface primary flame followed by a dark-zone temperature plateau at 600-1000 • C and a secondary flame followed by another dark-zone temperature plateau at 1000-1400 • C. At higher pressures (60 atm and above), a final flame is observed at about 1800 • C without the existence of any dark-zone temperature plateau. ADN combustion is stable in the range of 5-20 atm and the pressure sensitivity of the burning rate has the form r b = 20.72p 0.604 [mm/sec] (p = 0.5-2.0 MPa). The burning characteristics are controlled by exothermic decomposition in the condensed phase. Above 100 atm, the burning rate is well correlated with pressure as r b = 8.50p 0.608 [mm/sec] (p = 10-36 MPa). Combustion is stable, and intensive heat feedback from the gas phase dictates the burning rate. The pressure dependence of the burning rate, however, becomes irregular in the range of 20-100 atm. This phenomenon may be attributed to the competing influence of the condensed-phase and gas-phase exothermic reactions in determining the propellant surface conditions and the associated burning rate.

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Section: Dark Zones In Adn Combustionmentioning

confidence: 63%

Section: Dark Zones In Adn Combustionmentioning

confidence: 69%

Section: Dark Zones In Adn Combustionmentioning

confidence: 94%

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Thermal Decomposition and Combustion of Ammonium Dinitramide (Review)

Yang

Thakre

Yang

2005

Combust Explos Shock Waves

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“…As indicated above, our kinetic modeling was performed with the assumption that [NH 3 ] 0 ) [HNO 3 ] 0 , and the reaction was initiated by the decomposition of HNO 3 followed by the chain reactions involving H and OH with NH x and NO x (x ) 1-3): For kinetic modeling, we employed 115 reactions which have been utilized in our previous studies of the NH x + NO y (x ) 2, 3; y ) 1, 2) reactions [8][9][10][11] and ADN decomposition reactions. 3 The detailed reaction mechanism is provided in the Supporting Information, and only key reactions employed in the modeling are presented in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Thermal Decomposition of Gaseous Ammonium Nitrate at Low Pressure: Kinetic Modeling of Product Formation and Heterogeneous Decomposition of Nitric Acid

Park

Lin

2009

J. Phys. Chem. A

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The thermal decomposition of ammonium nitrate, NH(4)NO(3) (AN), in the gas phase has been studied at 423-56 K by pyrolysis/mass spectrometry under low-pressure conditions using a Saalfeld reactor coated with boric acid. The sublimation of NH(4)NO(3) at 423 K was proposed to produce equal amounts of NH(3) and HNO(3), followed by the decomposition reaction of HNO(3), HNO(3) + M --> OH + NO(2) + M (where M = third-body and reactor surface). The absolute yields of N(2), N(2)O, H(2)O, and NH(3), which can be unambiguously measured and quantitatively calibrated under a constant pressure at 5-6.2 torr He are kinetically modeled using the detailed [H,N,O]-mechanism established earlier for the simulation of NH(3)-NO(2) (Park, J.; Lin, M. C. Technologies and Combustion for a Clean Environment. Proc. 4th Int. Conf. 1997, 34-1, 1-5) and ADN decomposition reactions (Park, J.; Chakraborty, D.; Lin, M. C. Proc. Combust. Inst. 1998, 27, 2351-2357). Since the homogeneous decomposition reaction of HNO(3) itself was found to be too slow to account for the consumption of reactants and the formation of products, we also introduced the heterogeneous decomposition of HNO(3) in our kinetic modeling. The heterogeneous decomposition rate of HNO(3), HNO(3) + (B(2)O(3)/SiO(2)) --> OH + NO(2) + (B(2)O(3)/SiO(2)), was determined by varying its rate to match the modeled result to the measured concentrations of NH(3) and H(2)O; the rate could be represented by k(2b) = 7.91 x 10(7) exp(-12 600/T) s(-1), which appears to be consistent with those reported by Johnston and co-workers (Johnston, H. S.; Foering, L.; Tao, Y.-S.; Messerly, G. H. J. Am. Chem. Soc. 1951, 73, 2319-2321) for HNO(3) decomposition on glass reactors at higher temperatures. Notably, the concentration profiles of all species measured could be satisfactorily predicted by the existing [H,N,O]-mechanism with the heterogeneous initiation process.

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Rate constant for the NH3 + NO2 → NH2 + HONO reaction: Comparison of kinetically modeled and predicted results

Cited by 2 publications

References 0 publications

Thermal Decomposition and Combustion of Ammonium Dinitramide (Review)

Thermal Decomposition and Combustion of Ammonium Dinitramide (Review)

Thermal Decomposition of Gaseous Ammonium Nitrate at Low Pressure: Kinetic Modeling of Product Formation and Heterogeneous Decomposition of Nitric Acid

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