000162881 001__ 162881
000162881 005__ 20180128030129.0
000162881 0247_ $$2doi$$a10.1007/BF00053794
000162881 037__ $$aARTICLE
000162881 245__ $$aThe heterogeneous formation of N2O over bulk condensed phases in the presence of SO2 at high humidities
000162881 269__ $$a1996
000162881 260__ $$c1996
000162881 336__ $$aJournal Articles
000162881 500__ $$aCopyright 2003 ACS
000162881 500__ $$aCAPLUS
000162881 500__ $$aAN 1997:238960
000162881 500__ $$aCAN 126:296849
000162881 500__ $$a59-2
000162881 500__ $$aAir Pollution and Industrial Hygiene
000162881 500__ $$aLab. Pollution Atmospherique Sol,Ecole Polytechnique Fed. Lausanne,Lausanne,Switz. FIELD URL:
000162881 500__ $$aJournal
000162881 500__ $$aJATCE2
000162881 500__ $$awritten in English.
000162881 500__ $$aAshes (fly; heterogeneous formation of nitrous oxide over bulk condensed phases in presence of sulfur dioxide at high humidities); Exhaust gases; Flue gases (heterogeneous formation of nitrous oxide over bulk condensed phases in presence of sulfur dioxide at high humidities); Air pollution Role: POL (Pollutant), OCCU (Occurrence) (heterogeneous formation of nitrous oxide over bulk condensed phases in presence of sulfur dioxide at high humidities); Humidity Role: POL (Pollutant), OCCU (Occurrence) (relative; heterogeneous formation of nitrous oxide over bulk condensed phases in presence of sulfur dioxide at high humidities)
000162881 520__ $$aIn view of the uncertainty of the origin of the secular increase of N2O, we studied heterogeneous processes that contribute to formation of N2O in an environment that comes as close as possible to exhaust conditions contg. NO and SO2, among other constituents. The N2O formation was followed using electron capture gas chromatog. (ECD-GC). The other reactants and intermediates (SO2, NO, NO2 and HONO) were monitored using gas phase UV-VIS absorption spectroscopy. Expts. were conducted at 298 and 368 K as well as at dry and high humidity (approaching 100% rh) conditions. There is a significant heterogeneous rate of N2O formation at conditions that mimic an exhaust plume from combustion processes. The simultaneous presence of NO, SO2, O2 in the gas phase and condensed phase water, either in the bulk liq. or adsorbed state has been confirmed to be necessary for the prodn. of significant levels of N2O. The stoichiometry of the overall reaction is: 2 NO + SO2 + H2O -> N2O + H2SO4. The max. rate of N2O formation occurred at the beginning of the reaction and scales with the surface area of the condensed phase and is independent of its vol. A significant rate of N2O formation at 368 K at 100% rh was also obsd. in the absence of a bulk substrate. The diffusion of both gas and liq. phase reactants is not rate limiting as the reaction kinetics is dominated by the rate of N2O formation under the exptl. conditions used in this work. The simultaneous presence of high humidity (90-100% r.h, at 368 K) and bulk condensed phase results in the max. rate and final yield of N2O approaching 60% and 100% conversion after one hour in the presence of amorphous carbon and fly-ash, resp.
000162881 6531_ $$a10024-97-2 (Nitrogen oxide (N2O) Role: FMU (Formation
000162881 6531_ $$aunclassified)
000162881 6531_ $$aPOL (Pollutant)
000162881 6531_ $$aFORM (Formation
000162881 6531_ $$anonpreparative)
000162881 6531_ $$aOCCU (Occurrence) (heterogeneous formation of nitrous oxide over bulk condensed phases in presence of sulfur dioxide at high humidit
000162881 6531_ $$anitrous oxide heterogeneous formation sulfur dioxide; exhaust flue gas nitrous oxide formation; fly ash nitrous oxide formation
000162881 700__ $$aPires, M.
000162881 700__ $$0240886$$aVan den Bergh, H.$$g106613
000162881 700__ $$0245181$$aRossi, M. J.$$g106278
000162881 773__ $$j25$$k3$$q229-250$$tJournal of Atmospheric Chemistry
000162881 909C0 $$0252376$$pLPAS
000162881 909CO $$ooai:infoscience.tind.io:162881$$particle
000162881 937__ $$aEPFL-ARTICLE-162881
000162881 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000162881 980__ $$aARTICLE