The exact mechanism by which modifiers influence catalytic activity depends on the nature of the modifier and the catalyst. Some common mechanisms include:
Electronic effects: Modifiers can donate or withdraw electrons from the active site, altering its electronic properties and affecting adsorption and reaction rates. Geometric effects: Modifiers can block certain sites on the catalyst surface, influencing the distribution and arrangement of active sites. Chemical effects: Modifiers can react with the catalyst or the reactants to form new active species or intermediates.
