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Methanol adsorption by amorphous silica alumina in the critical temperature range

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Abstract

The methanol adsorption capacity of an amorphous silica-alumina was measured using an equilibrium technique. The experimental temperature range was of 140 to 260°C and the pure methanol pressure range was 0.1 to 1.2 MPa. A multilayer adsorption was found, also for temperatures above the critical temperature of the adsorbate. Based on the Jovanovic adsorption model, the mean residence times of the adsorbed molecules were calculated. Surprisingly, the heat of adsorption was found to be independent of the temperature in the multilayer adsorption range.

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Abbreviations

a :

parameter defined by Equation (7)

a′ :

parameter defined by Equation (10) Pa

a(T):

parameter in the Peng-Robinson equation Pa/(mol/m3)2

b :

parameter defined by Equation (8)

b′ :

parameter defined by Equation (11) Pa−1

b(T):

parameter in the Peng-Robinson equation m3 mol−1

c :

constant in the BET equation

k :

Boltzmann constant, being 1.3806 · 10−23 JK−1

K :

characteristic constant in the Peng-Robinson equation

m :

mass of one adsorbate molecule kg

p :

pressure Pa

q :

adsorption capacity g/g

Q :

heat of adsorption J mol−1

R :

gas constant, being 8.314 J mol−1 K−1

T :

absolute temperature K

V :

molar volume m3 mol−1

x :

relative pressure (=p/p 0)

σ :

active molecule area m2

τ :

residence time s

ω :

acentric factor

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Author notes

  1. M. Kuczynski

    Present address: Chemical Reaction Engineering Laboratories, Department of Chemical Engineering, Twente University of Technology, Enschede, The Netherlands

Authors and Affiliations

  1. Chemical Reaction Engineering Laboratories, Department of Chemical Engineering, Twente University of Technology, Enschede, The Netherlands

    A. van Ooteghem & K. R. Westerterp

Authors
  1. M. Kuczynski
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  2. A. van Ooteghem
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  3. K. R. Westerterp
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Kuczynski, M., van Ooteghem, A. & Westerterp, K.R. Methanol adsorption by amorphous silica alumina in the critical temperature range. Colloid & Polymer Sci 264, 362–367 (1986). https://doi.org/10.1007/BF01418197

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  • DOI: https://doi.org/10.1007/BF01418197

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