摘要:

AbstractThe kinetics of reaction of amino alcohols viz. 2‐aminoethanol, 3‐aminopropanol, and triethanolamine with chloramine‐Thave been studied in perchloric acid medium with palladous chloride as catalyst. The formation of {Pd(II)‐(aminoalcohol)} and {Pd(II)‐(aminoalcohol)2} complexes and resistance of {Pd(II)‐(aminoalcohol)2} complex to react with chloramine‐Thave been observed. A suitable mechanism consistent with the kinetic data is proposed

ISSN:0538-8066    

DOI:10.1002/kin.550230402

出版商:John Wiley&Sons, Inc.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe RAPRENOxprocess for NO reduction in combustion products involves reaction of nitric oxide with isocyanic acid. We have developed a mechanism for the gas‐phase reaction of isocyanic acid with nitric oxide in the presence of various amounts of O2, H2O, and CO. Kinetics calculations using the mechanism are compared with the experimental data of Siebers and Caton, and the model reproduces all trends of these data. Sensitivity and rate‐of‐production analyses show that the reactions of HNCO with OH, O, and H play a major role in the NO‐removal process and that NO removal occurs primarily by reaction of NO with NCO to form N2O, which subsequently reacts slowly to form N2. The overall reaction is critically dependent on production of radicals. When O2, H2O, and CO are present, the radicals are supplied by the moist‐CO chain branching sequence. When any of these species is absent, radicals must be supplied by other reactions, principally the N2O decomposition reaction and the reaction of the NH2radica

ISSN:0538-8066    

DOI:10.1002/kin.550230403

出版商:John Wiley&Sons, Inc.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe kinetics and the equilibrium constant of the chlorine transfer reaction between monochloramine NH2Cl and the amines: C2H5NH2, (CH3)2CHNH2, (CH3)2NH, and (C2H5)2NH are investigated by spectrophotometry in aqueous medium at 25°C, in the pH range from 8 to 13 and for an ionic strength equal to 1.03 ± 0.05M. For a concentration of total ammonia equal to 1M, the observed rate constant is pH independent below 8 and above 12.8 and reaches a maximum located between the pKas of NH4+and RR'NH2+. From these results and those obtained earlier for NH2Cl and CH3NH2, the reaction is shown to involve an interaction between neutral molecules NH2Cl and RR'NH, subject to general acid catalysis. The ability of an interaction corresponding to a specific catalysis and involving NH3Cl+and RR'NH rather than NH2Cl and RR'NH2+is also discussed. The activation parameters are given for each reactio

ISSN:0538-8066    

DOI:10.1002/kin.550230404

出版商:John Wiley&Sons, Inc.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe mechanism of ozone formation has been studied using16O and18O2. High‐resolution microwave spectroscopy was used to measure the amounts of the isotopomeric ozone species formed. The study is hampered by the very rapid exchange process between the reactants, that tends to scramble the isotopes and hence give a 2:1 statistical ratio between the two possible isotopomers. We have found a strategy to come around this difficulty and conclude that the mechanism is a simple end‐on‐add

ISSN:0538-8066    

DOI:10.1002/kin.550230405

出版商:John Wiley&Sons, Inc.    

年代:1991

数据来源: WILEY

摘要:

AbstractAliphatic amino acids are smoothly oxidized by peroxomonophosphoric acid (PMPA) in the pH region 6–10. Kinetic studies reveal second order dependence in the amino acid not observed hitherto in any of the PMPA oxidations. Dependence in PMPA is unity. Rate‐pH profile yields a maximum around pH 8. The reaction path includes oxidation steps due to H2PO5−and HPO52−. Second order dependence in the amino acid has been attributed to participation of two Zwitter‐ionic molecules of the amino acid to form a nu

ISSN:0538-8066    

DOI:10.1002/kin.550230406

出版商:John Wiley&Sons, Inc.    

年代:1991

数据来源: WILEY

ISSN:0538-8066    

DOI:10.1002/kin.550230401

出版商:John Wiley&Sons, Inc.    

年代:1991

数据来源: WILEY