Description: Nitrous oxide, N2O, is one of the 5 trace gases in addition to CO2, CH4, CFC's and O3 that is held responsible for climate forcing and that could potentially lead to an increase in global average temperatures (green house effect). The problem with N2O resides in the fact that there exists a larger uncertainty as to its anthropogenic sources compared to the other green house gases. This project investigates the possibility of N2O formation from combustion sources in a slow secondary process taking place in the plume of a smokestack at modest temperatures but at high relative humidities. The first phase of the project dealt with the kinetics of autoxidation of NO in aqueous solution leading exclusively to HONO at ambient temperature. The second phase deals with the heterogeneous formation of N2O starting from NO (typically 600 ppm), O2 (10 per cent) and SO2 (3000 ppm) at high humidities approaching 100 per cent at temperatures from 80 to 100 degrees centigrade. The rate of N2O formation is greatly enhanced in the presence of a condensed phase (interface) and at increased temperature. The N2O yield approaches 30 per cent of the NO. It seems therefore promising to look for the presence of N2O downstream of the plume of combustion sources.
SupportProgram
Origins: /Bund/UBA/UFORDAT
Tags: Ozon ? Blei ? Globale Durchschnittstemperatur ? Oxid ? Spurengas ? Gewächshaus ? Lachgas ? Kohlendioxid ? Schwefeldioxid ? Temperatur ? Verbrennung ? Schornstein ? Anthropogener Einfluss ? Oxidation ? Atmosphäre ? Chemische Reaktion ? Treibhauseffekt ? Feuchtigkeit ? Globale Aspekte ? Treibhausgas ? Temperaturabhängigkeit ? Rauchfahne ?
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 1994-01-01 - 1994-12-31
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