adsorption - Adsorption Reading Chap 12 Physical vs...

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9/13/11 Aerosol & Particulate Research Lab 11 Adsorption Physical vs chemical adsorption Sorbent materials Mechanism Isotherm Effects of humidity Fixed-bed systems Regeneration Rotary bed and fluidized bed systems Pressure drop Reading: Chap. 12
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9/13/11 Aerosol & Particulate Research Lab 22 Definition The concentration of gases, liquids or dissolved substances ( adsorbate ) on the surface of solids ( adsorbent ) Physical Adsorption ( van der Waals adsorption ): weak bonding of gas molecules to the solid; exothermic (~ 0.1 Kcal/mole); reversible Chemisorption : chemical bonding by reaction; exothermic (10 Kcal/mole); irreversible Q: Examples in your daily life? Physical vs Chemical
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9/13/11 Aerosol & Particulate Research Lab 33 Sorbent Materials Activated Carbon Activated Alumina Air Pollution Engineering Manual., 1992 Silica Gel Molecular Sieves Polar and Non-polar adsorbents Q: If an activated carbon granule is a solid particle with 1 mm diameter, what is the specific surface area ( ρ = 0.7 g/cm3)? Properties of Activated Carbon Bulk Density 22-34 lb/ft3 Heat Capacity 0.27-0.36 BTU/lboF Pore Volume 0.56-1.20 cm3/g Surface Area 600-1600 m2/g Average Pore Diameter 15-25 Å Regeneration Temperature (Steaming) 100-140 oC Maximum Allowable Temperature 150 oC http://www.activatedcarbonindia.com/activated_carbon.htm Tennis court in a bean!
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9/13/11 Aerosol & Particulate Research Lab 44 OH OH heating H2O H2O hydrophilic OH OH O hydrophobic H2O Q: What if it is heated over 250 oC? Properties of Silica Gel Bulk Density 44-56 lb/ft3 Heat Capacity 0.22-0.26 BTU/ lboF Pore Volume 0.37 cm3/g Surface Area 750 m2/g Average Pore Diameter 22 Å Regeneration Temperature 120-250 oC Maximum Allowable Temperature 400 oC
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9/13/11 Aerosol & Particulate Research Lab 55 Crystalline zeolite
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