Preface. List of Contributors. 1. Theoretical Principles of Single-- and Mixed--Gas Adsorption Equilibria on Heterogeneous Solid Surfaces (G.F. Cerofolini, W. Rudzinski). 2. Application of Lattice--Gas Models to Describe Mixed--Gas Adsorption Equilibria on Heterogeneous Solid Surfaces (Yu,K. Tovbin). 3. Theories of the Adsorption--Desorption Kinetics on Homogeneous Surfaces (H.J. Kreuzer, S.H. Payne). 4. Theory of Adsorption--Desorption Kinetics on Flat Homogeneous Surfaces (Yu.K. Tovbin). 5. Statistical Rate Theory and the Material Properties Controlling Adsorption Kinetics on Well Defined Surfaces (J.A.W. Elliot, C.A. Ward). 6. A New Theoretical Approach to Adsorption--Desorption Kinetics on Energetically Heterogeneous Flat Solid Surfaces Based on Statistical Rate Theory of Interfacial Transport (W. Rudzinski). 7. Surface Diffusion of Adsorbates on Heterogeneous Substrates (G. Zgrablich). 8. Computer Simulation of Surface Diffusion in Adsorbed Phases (W.A. Steele). 9. Multicomponent Diffusion in Zeolites and Multicomponent Surface Diffusion (Y.D. Chen, R.T. Yang). 10. Energy and Structure Heterogeneities for the Adsorption in Zeolites (A.S.T. Chiang, C.K. Lee, W. Rudzinski, J. Narkiewicz--Michalek, P. Szabelski). 11. Static and Dynamic Studies of the Energetic Surface Heterogeneity of Clay Minerals (F. Villieras (et al.). 12. Multilayer Adsorption as a Tool to Investigate the Fractal Nature of Porous Adsorbents (P. Pfeifer, K.-Y. Liu). 13. Heterogeneous Surface Structures of Adsorbents (K. Kaneko). 14. Characterization of Geometrical and Energetic Heterogeneities of Active Carbons by Using Sorption Measurements (M. Jaroniec, J. Choma). 15. Structure of Porous Adsorbents: Analysis Using Density Functional Theory and Molecular Simulation (C.M. Lastoskie, N. Quirke, K.E. Gubbins). 16. Dynamics of Adsorption in Heterogeneous Solids (D.D. Do). 17. Sorption Rate Processes in Carbon Molecular Sieves (J.M.D. MacElroy, N.A. Seaton, S.P. Friedman). Subject Index.