Catalysts,heterogeneous,homogeneous,andenzyme,areusuallynanoparticles.These areofvitalforthefunctioningofthehumanbody,forphotosynthesis,andforproducing fuels and chemicals in the petroleum and chemical industries. Interest in nanoscience and in nanotechnology in recent years has focused attention on the opportunity to develop catalysts that exhibit 100% selectivity for a desired product, thus removing byproducts and eliminating waste. This type of selective process is often called green chemistry or green technology. This book is the third Volume of Nanotechnology in Catalysis. It is mainly based on the symposium on Nanotechnology in Catalysis III which was held in fall 2004 at th the ACS 228 National Meeting in Philadelphia, PA. Several chapters were also from the authors who did not attend the symposium. We invited a few experts in the ?eld to write on a topic which we see is needed to make the book comprehensive. It has been about 2 years since Volumes 1 and 2 were published. Many new c- tributions and breakthroughs have been made by researchers worldwide, showing the dynamics in the area of nanotechnology in catalysis.

Nanotechnology and Heterogeneous Catalysis.- Oxide-Supported Metal Thin-Film Catalysts: The How and Why.- Developing Catalytic Nanomotors.- Catalysis by Gold: Recent Advances in Oxidation Reactions.- Gold Catalysts Supported on Nanostructured Materials: Support Effects.- Highly Effective Nanocatalysts Prepared Through Sol¿Gel Technique.- Dendrimer Templates for Supported Nanoparticle Catalysts.- Tungsten Oxide Nanorods: Synthesis, Characterization, and Application.- Catalysis by Metal and Oxide Nanoparticles, Single Metal Atoms and Di-Nuclear Oxo-Ions in Zeolites.- A Dual Catalytic Role of Co Nanoparticles in Bulk Synthesis of Si-Based Nanowires.- Influence of Particle Size and Interaction with the Support on Redox and Catalytic Properties of Metals, Metal Oxides, and Metal Complexes.- Thermo-Catalytic Oxidation of Dihydroxybenzenes in the Presence of Nanoparticle Iron Oxide.- Synthesis of Palladium-Based Supported Catalysts by Colloidal Oxide Chemistry.- Gold-Based Nanoparticle Catalysts for Fuel Cell Reactions.- Carbon-Supported Core-Shell PtSn Nanoparticles: Synthesis, Characterization and Performance as Anode Catalysts for Direct Ethanol Fuel Cell.