adsorption - 9/13/11 Aerosol & Particulate 9/13/11...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 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 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 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 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 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.ht Tennis court in a bean! 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 44 OH OH heating H2O H2O hydrophilic OH OH O hydrophobic H2O Q: What if it is heated over 250 oC?...
View Full Document

This note was uploaded on 09/11/2011 for the course ENV 4121 taught by Professor Lee during the Spring '08 term at University of Florida.

Page1 / 22

adsorption - 9/13/11 Aerosol & Particulate 9/13/11...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online