caa a22 4500 378891782 CHVBK 20180305123456.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/zpch.218.11.1307.50806 doi (NATIONALLICENCE)gruyter-10.1524/zpch.218.11.1307.50806 Reversible Gas Adsorption in Coated Wall Flow Tube Reactors. Model Simulations for Langmuir Kinetics [Elektronische Daten] [P. Behr, A. Terziyski, R. Zellner] A kinetic model has been developed to simulate reversible gas adsorption in coated wall flow tube reactors (CWFTs). The motivation of this work is to provide the theoretical framework for modelling studies in support of the results obtained from CWFT studies on the adsorption and desorption behaviour of atmospheric trace gases on ice surfaces at temperatures relevant to the upper troposphere/lower stratosphere (190-230K). The model consists of an axial sequence of individual flow tube sections of equal volumes in which the gas phase is homogeneously mixed and interactions with the coated wall occur by adsoption and desorption exclusively. The adsorption rate is assumed to be kinetically controlled and not to be transport limited. Moreover, chemical reactions are not considered. Simulations have been performed for the temporal behaviour of the gas phase concentration at the exit of the flow tube as a function of laboratory time for typical operation procedures of CWFTs with moveable injectors i.e. (i) instantaneous injection of the gas, (ii) instantaneous termination of the gas flow and (iii) movements of the injector with constant velocities. It is found that the temporal profiles show complex behaviours due to the overlap of adsorption and desorption upon successive exposure of the gas to different length of the ice surface. The validity of the model is demonstrated for the adsorption of acetone on an ice surface at 200K as a case study. © 2004 Oldenbourg Wissenschaftsverlag GmbH Thermodynamics & statistical physics nationallicence Laboratory techniques, experiments nationallicence Physical chemistry nationallicence Behr P. aut Terziyski A. aut Zellner R. aut Zeitschrift für Physikalische Chemie/International journal of research in physical chemistry and chemical physics Oldenbourg Wissenschaftsverlag GmbH 218/11/2004(2004-11-01), 1307-1327 0942-9352 218:11/2004<1307 2004 218 zpch https://doi.org/10.1524/zpch.218.11.1307.50806 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/zpch.218.11.1307.50806 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Behr P. aut NATIONALLICENCE 700 1- Terziyski A. aut NATIONALLICENCE 700 1- Zellner R. aut NATIONALLICENCE 773 0- Zeitschrift für Physikalische Chemie/International journal of research in physical chemistry and chemical physics Oldenbourg Wissenschaftsverlag GmbH 218/11/2004(2004-11-01), 1307-1327 0942-9352 218:11/2004<1307 2004 218 zpch CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter