Nitrogen adsorption typically occurs through two main mechanisms:
1. Physisorption: Nitrogen molecules are weakly bound to the catalyst surface through van der Waals forces. This type of adsorption is generally reversible and occurs at lower temperatures.
2. Chemisorption: Nitrogen molecules form stronger chemical bonds with the surface atoms of the catalyst. This process often involves the dissociation of nitrogen molecules into individual nitrogen atoms, which can then participate in further chemical reactions.
