Multicomponent Adsorption of Butane, NO₂ and SO₂ on Activated Carbon

Abstract

Dynamic adsorption experiments have been carried out with the help of an FT-IR (Fourier-Transform InfraRed) spectrometer. Fixed bed adsorption breakthrough curves were obtained for n-butane, SO 2 and NO 2 gases as well as for the reaction products NO, N 2 O and CO 2 . The adsorption of SO 2 and NO 2 on activated carbon was studied both during single-and co-adsorption experiments at 30ºC. The activated carbon used exhibited a disadvantage towards NO 2 adsorption in that it was partly converted to NO and immediately desorbed as NO. A further reaction to N 2 O could also be observed. The activated carbon was rapidly altered and lost a notable part of its loading capacity as a result of the presence of water and oxygen. During co-adsorption, SO 2 reacted with NO 2 (both as adsorbed species) and produced an additional amount of NO. An ash-tree spherical activated carbon with an extended surface area (1000 m 2 /g) was used in all experiments.

Laboratory comparison of relative performance of gas phase filtration media at high and low O 3 /NO 2 challenge concentrations (ASHRAE RP-1557)

“…Because of this erratic trend, the NOx and NO profiles showed different trends from the NO 2 overall trend. Media #2 NO case at high concentration as in Figure 3c presented a typical trend of NO in removing NO 2 found in the literature (Ahnert and Heschel 2002;Shirahama et al 2002). Further desorption of NO remained or adsorbed on the surface of ACs was observed at a lower RH than the standard conditions, especially in Media #1 and #2.…”

“…It was clearly seen that ACbased media (Media #1-#4) generated NO as a byproduct in removing NO 2 , but non-AC media maintained a similar level of NO concentration during the entire testing period to that of the background supply air, indicating that there was almost no generation of NO during the testing, as indicated in Figures 3a and 3b. Ahnert and Heschel (2002) and Klose and Rincón (2007) studied the chemical reaction mechanisms and byproducts of ACs with NO 2 and summarized the reaction as follows:…”

Synthesis of Magnesium Oxide Nanoplates and Their Application in Nitrogen Dioxide and Sulfur Dioxide Adsorption

“…e adsorption capacity and experimental conditions of these materials are summarized in Table 2. Interestingly, the MgO nanoplates exhibited relatively higher adsorption capacity than microporous activated carbon and zeolite [36,37].…”

The Use of Nanocarbons as Chemical Filters for the Selective Detection of Nitrogen Dioxide and Ozone

“…As an example, the mechanical grinding of CNFs led to enhanced NO 2 filtering yields. The interactions of carbons with NO 2 were already investigated in the cases of activated carbon fibres, 25 activated carbon, 26 carbon black 27 and various nanocarbons such as SWCNTs, 28 MWCNTs. 29 Nevertheless, it is important to note that these studies have been performed with NO 2 concentration range of 0.5-100 ppm, 31 400 or 600 ppm 29 250-1000 ppm, 27 i.e., significantly higher than in our conditions.…”