title: Kinetic modeling of the adsorption rate of a gaseous adsorbate on a granular adsorbent by ultra-rapid-scanning Fourier transform infrared spectrometry.
abstract: A novel method for determining the rates of adsorption of gaseous adsorbates on granular adsorbents in the millisecond time regime is described. Mixtures of the adsorbate and nitrogen are passed through a solenoid valve and 100 mg of the adsorbent for periods of (typically) 100 ms. The concentration of the adsorbate passing into a low-volume, long path length gas cell is measured with an ultra-rapid-scanning Fourier transform infrared spectrometer capable of gathering 200 mid-infrared spectra per second with 6-cm(-1) resolution. The pressure of the gas entering the cell is measured simultaneously with a capacitance manometer. A dynamic mathematical model was developed to analyze and describe the results in terms of a Langmuir isotherm. The success of this approach is demonstrated by the estimation of the rate of adsorption of vapor-phase acetaldehyde on aminopropylsilylated granular silica gel.
authors.affiliation: Department of Chemistry, University of Idaho, Moscow, ID 83844-2343, USA.
authors.forename: Benjamin A
authors.initials: BA
authors.lastname: Weinstock
authors.forename: Husheng
authors.initials: H
authors.lastname: Yang
authors.forename: Blayne L
authors.initials: BL
authors.lastname: Hirsche
authors.forename: Peter R
authors.initials: PR
authors.lastname: Griffiths