Chapter 4 Properties of nanomaterials
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Catalysis<br />
Catalysis is the change in rate <strong>of</strong> a chemical reac;on due to the par;cipa;on <strong>of</strong> a<br />
substance called a catalyst.<br />
Unlike other reagents that par;cipate in the chemical reac;on, a catalyst is not<br />
consumed by the reac;on itself.<br />
A catalyst may par;cipate in mul;ple chemical transforma;ons.<br />
Catalysts that speed the reac;on are called posi;ve catalysts.<br />
Substances that interact with catalysts to slow the reac;on are called inhibitors (or<br />
nega;ve catalysts).<br />
Substances that increase the ac;vity <strong>of</strong> catalysts are called promoters, and<br />
substances that deac;vate catalysts are called cataly;c poisons.
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