How to add the catalyst in the rate equation in Aspen HYSYS. Currently, it is showing as the function of reactor volume (m3), and there is no option that can make the units as mol/s.g-cat.Pa. Thank you.
Can you please specify what you mean. The catalyst determines the character of rata low. So a given equation with specified parameters concerns a given catalyst.
You can convert to units of kgcat by using equation which has the properties of the catalyst and reactor such as void fraction, catalyst density, particle size.