This book is about the nanoparticles which are metal supported and shows catalytic applications. generally, nanoparticle is defined as a particle which has at least one of its dimensions in the range of 1 to 100 nm. they have remarkably different properties as compared to their bulk equivalents which is mainly due to degenerated density of energy states in comparaison to bulk metals and a large surface to volume ratio.the catalytic activity of nanoparticles represents a rich resource for chemical processes, employed both in industry and in academia. nanoform enhances the exposed surface area of the catalyst, thereby enhancing the contact between reactants molecules and catalyst dramatically and thus mimicking homogeneous catalysts.