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Physical Chemistry Chemical Physics Vol -19

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Organic surfaces excited by low-energy ions: atomic collisions, molecular desorption and buckminsterfullerenes

Position-dependent energy of molecules in nano-confined water

Translational self diffusion anisotropy in the smectic A phase measured by a static fringe field gradient ¹H NMR diffusometry approach

Investigation of the surface structure of zeolite A

Infrared spectra of the Cl^––C₂H₄ and Br^––C₂H₄ anion dimers

Photophysics of ruthenium polypyridyl complexes formed with lacunary polyoxotungstates with iron addenda

A kinetic model for uptake of HNO₃ and HCl on ice in a coated wall flow system

Kinetics of model energy landscapes: an approach to complex systems

Time-resolved total internal reflection fluorescence spectroscopyPart I. Photophysics of Coumarin 343 at liquid/liquid interface

Conformation of glycosaminoglycans by ion mobility mass spectrometry and molecular modelling

Reduced and oxidized cytochrome c₄ exhibit differences in dynamics

Protein–lipid interactions at the air/water interface

Monte Carlo simulation of an inhomogeneous dielectric continuum model for B-DNA

Simulation of proliferation of neural stem cells on a surface with emphasis on spatial constraints on cell division

Guest–host encapsulation of microporous zeolites in ordered mesoporous materials by molecular simulations

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A kinetic model for uptake of HNO₃ and HCl on ice in a coated wall flow system

Content Provider	Royal Society of Chemistry (RSC)
Author	Cox, R. Anthony Ullerstam, Maria Abbatt, Jonathan P. D. Symington, Angela Fernandez, Miguel A.
Copyright Year	2005
Abstract	A simple model of gas flow and surface exchange with a single site Langmuir mechanism has been developed to describe effects of adsorption and desorption on trace gas concentrations at the outflow from a coated wall flow tube reactor. The model was tested by simulating experimental results for the uptake of HNO3 and HCl on ice films at temperatures and gas concentrations corresponding to the ice stability region in the upper troposphere. The experimental time-dependent uptake profiles were best fitted with an additional process involving diffusion of the adsorbed molecules into the ice film. The model allowed true surface coverages to be distinguished from total uptake including transfer to the bulk, leading to more accurate estimates of the Langmuir constant, Keq, for surface adsorption. A revised expression was obtained for the temperature dependence of the Keq = −(4.43 ± 0.77) × 105T + (10.72 ± 1.75) × 107 hPa−1. Reasonable fits to the desorption profiles observed following cessation of exposure of the film to HNO3 or HCl were obtained at high surface coverage but at low coverage desorption was too slow. The analysis suggested that the ice surface was characterised by sites of different binding energy, some weakly bound sites from which the acid molecules desorbed rapidly, and some strong-binding sites which led to essentially irreversible uptake. Experiments involving competitive co-adsorption of HNO3 and HCl, conducted at relatively high equilibrium surface coverage, were well simulated by the model, as were those where the same surface was repeatedly exposed to gas phase acids.
Starting Page	3434
Ending Page	3442
Page Count	9
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	7
Issue Number	19
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/b506683b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Adsorption Dependent and independent variables Langmuir Keq Binding energy Troposphere Hydrogen chloride Diffusion Langmuir adsorption model Nitric acid Pascal (unit)
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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A kinetic model for uptake of HNO₃ and HCl on ice in a coated wall flow system

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A kinetic model for uptake of HNO3 and HCl on ice in a coated wall flow system

A kinetic model for uptake of HNO₃ and HCl on ice in a coated wall flow system