(1) Activity. It is a measure of the effectiveness of the catalyst. Industrially, it is usually expressed in terms of the number of products obtained per unit time per unit volume (or by weight) of the catalyst under certain conditions.
(2) Selectivity. It refers to the specificity of the action of the catalyst, that is, under certain conditions, a certain catalyst only accelerates a certain chemical reaction. The selectivity is usually expressed as a percentage of the ratio of the number of moles of the desired product obtained after the reaction to the number of moles of the starting material participating in the reaction.
(3) Stability. Refers to the ability of the catalyst to maintain its activity and selectivity during use, usually expressed in terms of service life. The good performance of the catalyst depends not only on the intrinsic properties of the active metal (the electronic structure of the atom, etc.) but also on its crystal structure, particle size, specific surface area, pore structure and dispersion state. In addition, the cocatalyst and support also have a significant impact on the performance of the catalyst.