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Titolo:
A kinetic study of the reaction of NO2 with HI over the temperature range 278 to 333 K
Autore:
Diao, GW; Chu, LT;
Indirizzi:
New York State Dept Hlth, Wadsworth Ctr Labs & Res, Albany, NY 12201 USA New York State Dept Hlth Albany NY USA 12201 & Res, Albany, NY 12201 USA SUNY Albany, Dept Environm Hlth & Toxicol, Albany, NY 12201 USA SUNY Albany Albany NY USA 12201 ronm Hlth & Toxicol, Albany, NY 12201 USA
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 9, volume: 3, anno: 2001,
pagine: 1622 - 1630
SICI:
1463-9076(2001)3:9<1622:AKSOTR>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROUS-ACID; URBAN ATMOSPHERE; WATER-VAPOR; ICE FILMS; IODINE; RADICALS; PHOTOCHEMISTRY; ABSORPTION; CHEMISTRY; HYDROXYL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Diao, GW New York State Dept Hlth, Wadsworth Ctr Labs & Res, Albany, NY 12201 USA New York State Dept Hlth Albany NY USA 12201 lbany, NY 12201 USA
Citazione:
G.W. Diao e L.T. Chu, "A kinetic study of the reaction of NO2 with HI over the temperature range 278 to 333 K", PHYS CHEM P, 3(9), 2001, pp. 1622-1630

Abstract

The rate constant, k, for the reaction, NO2+HI --> products, has been measured directly for the first time. The rate was found to be -d[NO2]/dt=k[NO2][HI] with k=(6.9 +/-1.1)x10(-19) cm(3) molecule(-1) s(-1) at 303 K. The measurements were made under pseudo-first-order conditions with HI in excess over NO2. NO2 loss rate was monitored by FTIR in a static glass reactor. NO, H2O and I-2 were observed as products and HNO2 as an intermediate. The study showed that the reaction was influenced by the conditions of the wall which had a surface loss rate constant k(w)=0.13 s(-1). This indicates that the measured k is an upper limit. Within a limited pressure range, the ratewas independent of the total pressure in the system. From measurements made over the temperature range 278-333 K, we obtained the following expression for k=(3.6 +/-0.2)x10(-14)x exp[-(2.7 +/-0.7)x10(4)/RT] cm(3) molecule(-1) s(-1) valid between 293 and 333 K. A reaction scheme is proposed involving NO2+HI -->HNO2+I as the initiation step based on the kinetic and product studies, followed by a heterogeneous reaction between HNO2 and HI. A comparison of the reactions between NO2 with HX is made. This reaction is unlikely to play a major role in the removal of HI and as a source for HNO2 in theatmosphere because of its slow rate.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 12:51:00