CO2 Adsorption Technologies Quiz

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Which type of solids are used for ambient temperature CO2 adsorption?

Polyethylene and polypropylene

Zeolites and metal-organic frameworks (MOFs) (correct)

Activated carbon and graphene

Silica and aluminum based high surface area porous solids

What is a major disadvantage of current adsorption processes for CO2?

High energy consumption

Difficulty in regeneration of adsorbents

Limited to small-to-medium scale tonnage separations (correct)

Inability to capture CO2 at low temperatures

What modification is made to silica and aluminum based high surface area porous solids to adsorb CO2 at low temperatures?

Introduction of fluorine atoms

Incorporation of metal nanoparticles

Addition of amine groups (correct)

Doping with carbon nanotubes

What is the selectivity mechanism for CO2 adsorption on aminophenyl surface groups?

Large number of aminophenyl groups Signup and view all the answers

What type of equilibria serves as the selectivity mechanism for CO2 adsorption?

Adsorption equilibria Signup and view all the answers

What is the ideal isotherm for CO2 adsorption?

Ideal isotherm for the hexa-amino group Signup and view all the answers

What is a disadvantage of liquid phase chemical absorption systems for CO2 capture?

Amine breakdown during regeneration Signup and view all the answers

What are the alternatives mentioned for CO2 adsorption?

Physical adsorption using molecular sieving zeolites, metal-organic frameworks (MOFs) Signup and view all the answers

What will enhance capacity in CO2 adsorption processes?

Improved adsorbents Signup and view all the answers

What type of equilibrium condition is represented by ci(A) = Kici(B) where Ki >> 1?

Under equilibrium conditions Signup and view all the answers

What type of equilibria is mentioned in the context of CO2 adsorption?

Adsorption equilibria Signup and view all the answers

What is the disadvantage of current adsorption processes for CO2?

Limited to small-to-medium scale tonnage separations Signup and view all the answers

In the context of CO2 capture, what does a steep curve in the amount adsorbed vs. pressure graph indicate?

High loading of CO2 at low pressures Signup and view all the answers

What does the selectivity to CO2 indicate in the given graph?

Increasing CO2 selectivity Signup and view all the answers

What does the equation $c (B) i,IN$ represent in the context of sorption with regeneration?

Initial concentration of component i in the interstitial fluid Signup and view all the answers

What does the term 'bed voidage' ($\ñB$) represent in the context of sorption with regeneration?

Volume of the void spaces in the adsorbent bed Signup and view all the answers

In the context of membrane separations, what does the term 'Ls' represent?

Length of the selective layer Signup and view all the answers

What does the equation $\ñB = bed voidage$ represent in the context of sorption with regeneration?

Equation for the bed voidage Signup and view all the answers

What does the term 'Ki >> 1' indicate in the context of sorption equilibrium?

Strong preference for component A over component B Signup and view all the answers

What does the term 'DB, D(A)' represent in the context of sorption with regeneration?

Dispersion and pore diffusion coefficients Signup and view all the answers

What does the equation $ci (t,L) = c (B) i,IN$ represent in the context of sorption with regeneration?

Equilibrium concentration of component i in the interstitial fluid Signup and view all the answers

What does the term 'μ' represent in the context of sorption with regeneration?

Dimensionless time parameter Signup and view all the answers

What does the term 'Gpi' represent in the context of sorption with regeneration?

Pore diffusion coefficient Signup and view all the answers