Chemistry is a wonderful subject to learn. In this nature each and every object/thing made up with the chemical combination of different types of elements, that is the importance of CHEMISTRY. In this book the authors Dr Aravind Kumar Rathod and Mrs Aruna Rathod want to explain the necessity of the catalysts (Homogeneous and Heterogeneous) in chemical reactions. If you can go through the book chapters you can understand clearly the development of new synthetic methodologies using different types of catalysts. Authors try to explain various types of Heterogeneous catalysts that are available commercially and self (Laboratory) prepared Heterogeneous catalysts. They clearly try to explain how to Recycle and Reuse the same catalyst in other reactions two to three times without loosing the reaction yield (%, purity and quantity of reaction). This book explains the application of heterogeneous catalysts subjected to different named reactions in chemical sciences. This book is very helpful to the Undergraduate (UG) and Postgraduate (PG) students to know the importance of catalysts and their different use in laboratory. All the very best!