Heterogeneous chemical processing of 13NO2 by monodisperse carbon aerosols at very low concentrations

The heterogeneous reaction of NO2 with different carbon aerosol particles was investigated in situ. The NO2 was labeled with the β+-emitter 13N (half-life 10.0 min) which allowed application of NO2 at very low concentrations. The carbon aerosol was either produced by a spark discharge generator using graphite electrodes or by a brush generator resuspending commercial soot material. Monodisperse size cuts between 50- and 490-nm diameter were selected and mixed with the 13NO2. After a defined reaction time, the different reaction products were separated by means of selective traps and detected on-line by γ-spectrometry. A sticking coefficient for chemisorption of NO2 between 0.3 × 10ˉ⁴ and 4.0 × 10ˉ⁴ and a rate constant for the reduction of adsorbed NO2 to NO(g) between 4.0 × 10 ˉ⁴ and 9.4 × 10 ˉ⁴ /s were determined for both aerosols. The sticking coefficient obtained in this study in situ with aerosol particles is 2 orders of magnitudes smaller than the uptake coefficient recently reported with bulk carbon material.

Schlagwörter

Fachgebiet (DDC)

550 - Geowissenschaften
540 - Chemie

Projekt

Veranstaltung

Startdatum der Ausstellung

Enddatum der Ausstellung

Startdatum der Konferenz

Enddatum der Konferenz

Datum der letzten Prüfung

ISBN

ISSN

0022-3654
1541-5740

Sprache

Englisch

Während FHNW Zugehörigkeit erstellt

Nein

Zukunftsfelder FHNW

Publikationsstatus

Veröffentlicht

Begutachtung

Peer-Review der ganzen Publikation

Open Access-Status

Closed

Lizenz

Zitation

KALBERER, Markus, K. TABOR, Markus AMMANN, Yves PARRAT, Ernest WEINGARTNER, D. PIGUET, E. RÖSSLER, Dieter T. JOST, Andreas TÜRLER, Heinz W. GÄGGELER und Urs BALTENSPERGER, 1996. Heterogeneous chemical processing of 13NO2 by monodisperse carbon aerosols at very low concentrations. The Journal of Physical Chemistry. 19 September 1996. Bd. 100, Nr. 38, S. 15487–15493. DOI 10.1021/jp9606974. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46915

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