Porosity

Question 1

Define porosity accessibility

Answer 1

○ Open - connected to external surface allows passage of adsorbate
○ Closed - isolated void within solid, not connected to external surface
○ Transport - connect parts of external surface to inner micro porosity
○Blind - not isolated but not leading to other pores/surface

Question 2

Define pores

Answer 2

· Pores are minute openings accessible to vapours and gases

=> have irregular shape in carbon and regular shape in zeolites

Question 3

Does porosity interact with the adsorbate?

Answer 3

Not porosity that interacts directly with adsorbate but the internal surface of adsorbent

Question 4

Define internal surface

Answer 4

Area surrounding closed pores as well as fissures and cracks which penetrate deeply into interior of adsorbent = deeper than wide

Question 5

Describe external surface

Answer 5

Protrusions and superficial cracks = wider than deep

Question 6

Pore classification

Answer 6

Micropore
Mesopore
Macropore