I was studying about heterogenous catalysis, and my Professor said something along the line, "When the adsorption energy is comparable to (or lower than) heat of evaporation, then it is physisorption. When it is larger than that, it tends to be chemisorption"
By this logic, that meant the energy for chemisorption is different for each chemical species. Is this statement true? Or am I understanding it wrong?If anyone have a reference on this, please let me know. I've been searching for quite a while.