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Titolo:
Direct measurements of the reaction NH2+H-2 -> NH3+H at temperatures from 1360 to 2130 K
Autore:
Friedrichs, G; Wagner, HG;
Indirizzi:
Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany Univ GottingenGottingen Germany D-37077 hem, D-37077 Gottingen, Germany
Titolo Testata:
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
, volume: 214, anno: 2000,
parte:, 8
pagine: 1151 - 1160
SICI:
0942-9352(2000)214:<1151:DMOTRN>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
RATE-CONSTANT; GAS-PHASE; NH2; KINETICS; RADICALS; H2;
Keywords:
chemical kinetics; elementary reactions; shock waves; frequency modulation spectroscopy; NH2 radicals;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Wagner, HG Univ Gottingen, Inst Phys Chem, Tammannstr 6, D-37077 Gottingen, Germany Univ Gottingen Tammannstr 6 Gottingen Germany D-37077 Germany
Citazione:
G. Friedrichs e H.G. Wagner, "Direct measurements of the reaction NH2+H-2 -> NH3+H at temperatures from 1360 to 2130 K", Z PHYS CHEM, 214, 2000, pp. 1151-1160

Abstract

The reaction NH2 + H-2 --> N-3 + H (11) was investigated behind shock waves in the temperature range from 1360 to 2130 K. Time histories of NH2 were measured by frequency modulation (FM) spectroscopy. The rate constant was determined to be k(11) = 4.5.10(13).exp[-61 kJ mol(-1)/RT] cm(3) mol(-1) s(-1) (Delta log k(11) = +/- 0.15, Delta E-a = +/- 9 kJ/mol). According to recent literature values the reverse reaction NH3 + H --> NH2+ H-2 (-11) can be described by k(-11) = 1.5.10(7).T-2.0.exp(-47 kJ mol(-1)/RT) cm(3) mol(-1) s(-1) for the temperature range of 400 to 2500 K. On the basis of k(-11) and by using the enthalpy of formation of Delta(f)H(298)(0) (K)(NH2) = 190 kJ/mol, which was determined in a previous study [1], viadetailed balance the following expression for the forward reaction (11) was obtained for a temperature range of 400 to 2200 K: k(11) = 1.5.10(4).T-2.6.exp(-25 kJ mol(-1)/RT) cm(3) mol(-1) s(-1). This expression is in very good agreement with the reported experimental values for k(11).

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Documento generato il 28/03/20 alle ore 22:57:46