TY - JOUR
T1 - High-capacity NO2 denuder systems operated at various temperatures (298-473 K)
AU - Wolf, Jan Christoph
AU - Niessner, Reinhard
PY - 2012/12
Y1 - 2012/12
N2 - In this study, we investigated several coatings for high-temperature, high-capacity, and high-efficiency denuder-based NO2 removal, with the scope to face the harsh conditions and requirements of automotive exhaust gas sampling. As first coating, we propose a potassium iodide (KI)/polyethylene glycol coating with a high removal efficiency (ε>98 %) for about 2 h and 50 ppm NO2 at room temperature (298 K). At elevated temperatures (423 K), the initial capacity (100 ppmh) is decreased to 15 ppmh. Furthermore, this is the first proposal of the ionic liquid methylbutyl- imidazolium iodide ([BMIm+][I-]) as denuder coating material. At room temperature, this ionic liquid exhibits far greater capacity (300 ppmh) and NO2 removal efficiency (ε>99.9 %) than KI. Nevertheless, KI exhibits a slightly (~10 %) higher capacity at elevated temperatures than [BMIm+][I-]. Both coatings presented are suitable for applications requiring selective denuding of NO2 at temperatures up to 423 K.
AB - In this study, we investigated several coatings for high-temperature, high-capacity, and high-efficiency denuder-based NO2 removal, with the scope to face the harsh conditions and requirements of automotive exhaust gas sampling. As first coating, we propose a potassium iodide (KI)/polyethylene glycol coating with a high removal efficiency (ε>98 %) for about 2 h and 50 ppm NO2 at room temperature (298 K). At elevated temperatures (423 K), the initial capacity (100 ppmh) is decreased to 15 ppmh. Furthermore, this is the first proposal of the ionic liquid methylbutyl- imidazolium iodide ([BMIm+][I-]) as denuder coating material. At room temperature, this ionic liquid exhibits far greater capacity (300 ppmh) and NO2 removal efficiency (ε>99.9 %) than KI. Nevertheless, KI exhibits a slightly (~10 %) higher capacity at elevated temperatures than [BMIm+][I-]. Both coatings presented are suitable for applications requiring selective denuding of NO2 at temperatures up to 423 K.
KW - Denuder
KW - Elevated temperature
KW - Ionic liquid
KW - Nitrogen dioxide
KW - Potassium iodide
UR - http://www.scopus.com/inward/record.url?scp=84870929744&partnerID=8YFLogxK
U2 - 10.1007/s00216-012-6400-1
DO - 10.1007/s00216-012-6400-1
M3 - Article
AN - SCOPUS:84870929744
SN - 1618-2642
VL - 404
SP - 2901
EP - 2907
JO - Analytical and Bioanalytical Chemistry
JF - Analytical and Bioanalytical Chemistry
IS - 10
ER -