An ideal textbook developed other than monographs for semester courses at graduate levelContents suitably prepared thereby making an inter-disciplinary subject into a formidable oneTheoretical and practical features are considered according to industrial standardsABOUT THE BOOK:Heterogeneous Catalysis is a subject of great industrial importance. Almost eighty per cent of the heavy chemicals are produced by employing heterogeneous catalysts at some stage or other. This is why it has become necessary to introduce the subject in the graduate programmes in Chemistry and Chemical Technology.The first few chapters are concerned with the adsorption phenomenon-physical adsorption and chemisorption. The next some chapters discuss some general principles of catalysis, catalysis by metals, semiconductors and acidic solids including zeolites and clays. It also presents the mechanism of some selected reactions. Various experimental techniques such as infrared and Raman spectroscopy, thermal methods, ESCA and Auger methods as well as NMR, EPR and Mossbauer spectroscopic methods for characterizing solid catalysts have been discussed in other chapters. The last two chapters of the book have catalyst preparation and the role of diffusion in heterogeneous catalysis.The author` principle objective in writing this book was ``No prior knowledge of catalysis is required and the book can also be used for self-study``.