Development of a MnO2-coated,cylindrical denuder for removing NO2 from atmospheric samples |
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| Institution: | 1. University of Crete, Department of Chemistry, Environmental Chemical Processes Laboratory (ECPL), 71003 Heraklion, Crete, Greece;2. National Observatory of Athens, Institute for Environmental Research and Sustainable Development, 15236 P. Penteli, Athens, Greece;3. IMT Lille Douai, Institut Mines-Télécom, Univ. Lille, Centre for Energy and Environment, F-59000 Lille, France;4. LSCE, Laboratoire des Sciences Du Climat et de L''Environnement, Unité Mixte CNRS-CEA-UVSQ, CEA/Orme des Merisiers, 91191 Gif-sur-Yvette Cedex, France;1. MINTOTA Research Group, Departament de Química Analítica, Facultat de Química, Universitat de València, Dr. Moliner 50, Burjassot, 46100 València, Spain;2. Departamento de Control Químico, Facultad de Química y Farmacia, Universidad Nacional Autónoma de Honduras, Ciudad Universitaria, Tegucigalpa, Honduras |
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| Abstract: | In order to develop a diffusion denuder for the removal of NO2 from ambient atmospheric samples, a number of materials were screened for their ability to adsorb NO2: - 1.(1) MgO;
- 2.(2) MnO2 on alpha-Al2O3;
- 3.(3) water-treated MnO2 on alpha-Al2O3; and
- 4.(4) MnO2 (activated).
A simple cylindrical denuder coated with MnO2 (activated) was very effective in the removal of NO2 from a feedgas of NO2 in air at ambient temperature and pressure. The other materials were unsatisfactory. The strong oxidizing properties, along with the hydrated surface of the MnO2 (activated), appear to be important for the sorption of NO2, as suggested in applications elsewhere. Quantification of denuder sorption efficiencies indicates that MnO2 (activated) is nearly a perfect sorbent for NO2. The diffusion coefficient of NO2 in air was found to be 10.8 ± 0.3 cm2 min?1 at 22–23°C, which compares favourably with a theoretical estimate. Although MnO2 (activated)-coated denuders were also found to adsorb SO2, interference with NO2 sorption was not sufficient to impair ambient applications. |
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