In Memorian Erhard G. Christoffel. 1. Introduction. References. 2. Basic Phenomena and Concepts in Catalysis. Historical. Catalytic systems. Laboratory studies of heterogeneous catalytic processes. References. 3. Investigation of Heterogeneous Catalytic Reaction Systems. Investigation of reaction mechanisms. Dynamic modeling. Mass transport in porous media. Catalyst deactivation. References. 4. Laboratory Reactors. Micropulse reactor. Single-pellet diffusion reactors. Fixed-bed reactors. Recycle reactors. Transient response method. References. Subject Index. Author Index.