Temperature: Higher temperatures generally increase the kinetic energy of molecules, enhancing diffusivity. Pressure: In gases, higher pressure can decrease diffusivity by increasing the number of molecular collisions. Molecular Size: Larger molecules diffuse more slowly due to increased resistance. Medium: The nature of the medium (gas, liquid, or solid) significantly affects diffusivity. For instance, molecules diffuse much faster in gases than in liquids or solids. Pore Size: In porous catalysts, the size and structure of the pores can either facilitate or hinder diffusion.
