Lecture-2

What is the primary chemical composition of activated alumina adsorbents?

• Al2O3

• SiO2

• Fe2O3

• CaO

Which property of activated alumina provides adsorption selectivity?

• Large surface area

• Fine pore structure

• Surface chemistry

• High purity

What is the typical Al2O3 content in preferred activated alumina materials?

• 90%

• 95%

• 99%

• 100%

Which gases are commonly dried using activated alumina?

• Oxygen and nitrogen

• Air and argon

• Helium and methane

• Chlorine and sulfur dioxide

What does the capacity for water adsorption with activated alumina depend on?

• Adsorption temperature

• Surface area

• Purity

• Particle size

What is the primary purpose of using activated carbon canisters on automobile fuel tanks?

• To increase fuel efficiency

• To reduce hydrocarbon emissions

• To improve engine performance

• To store excess fuel

What type of activated carbon is often used for solvent recovery due to its regenerative nature?

• Liquid-phase activated carbon

• Gas-phase activated carbon

• Granulated activated carbon

• Aerogels

What is the primary characteristic of liquid-phase activated carbons that makes them suitable for decolorizing aqueous solutions?

• High surface area

• Large pore size

• Affinity for organic compounds

• Low density