ABSTRACT
In porous adsorbent/catalyst pellets or separation membranes (barriers), nonhomogeneitymaybeintroducedeitherdeliberately(laminates,“asymmetric”membranes)orspuriously(e.g.,“skinlayers”onpowdercompactsor extrudedpellets),leadingineachcasetocorrespondingspatialdependence oftherelevantgassorptionanddiffusioncoef„cients,SandDT, which are de„nedhereasfollows(PetropoulosandRoussis1967a,b;Petropoulos1985):
S C a= / (7.1)
CONTENTS
7.1 Introduction ................................................................................................253 7.2 Steady-State Permeability Properties ...................................................... 255
7.2.1 Concentration-Independent Systems ..........................................255 7.2.2Concentration-Dependent Systems .............................................255
7.3 Permeation Time Lags (Concentration-Independent Systems) ...........256 7.3.1 Sorption and Permeation Apparatus for a Gaseous
