SURFACE AREA AND POROSITY

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IUPAC classification on pores - Macroporous >50nm - Mesoporus 2-50nm - Microporus
Porosity - pore volume Total pore volume is derived from the amount of vapour adsorbed at a relative temperature close to unity (assuming pores are filled with liquid adsorbate). V ads = volume of gas adsorbed V liq = volume of liquid N 2 in pores V m = molar vol. of liquid adsorbate (N 2 =34.7cm 3 /mol) P a = ambient pressure T = ambient temperature
Page 1 and 2: presented by Neal Leddy CMA Analyti
Page 3 and 4: Characteristics of Physical Adsorpt
Page 5 and 6: Iostherm types described by Brunaue
Page 7 and 8: Type II Most frequently found when
Page 9 and 10: Type IV Occur on porous adsorbents
Page 11 and 12: Adsorbate The most common adsorbat
Page 13 and 14: BET equation requires a linear plot
Page 15 and 16: Single point BET: Involves determin
Page 17 and 18: Relative Pressure P/Po Volume @ STP
Page 19: Langmuir The Langmuir equation des
Page 23 and 24: Adsorption/Desorption Isotherm
Page 25 and 26: Other Methods Barrett-Jo
Page 27 and 28: Analysis Adsorbate is introduced i

SURFACE AREA AND POROSITY

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