Nanomaterial-based catalysts are usually
heterogeneous catalysts broken up into
metal nanoparticles in order to speed up the catalytic process. Metal nanoparticles have a higher
surface area so there is increased catalytic activity because more catalytic reactions can occur at the same time. Nanoparticle catalysts can also be easily separated and recycled with more retention of catalytic activity than their bulk counterparts. These catalysts can play two different roles in catalytic processes: they can be the site of
catalysis or they can act as a
support for catalytic processes. They are typically used under mild conditions to prevent decomposition of the nanoparticles at extreme conditions.