Isothermal composite adsorbent. Part I: Thermal characterisation

Adsorption of Carbon Dioxide for Post-combustion Capture: A Review

“…10 Another viable approach is represented by the development of sorbent particles embedded with phase change materials (PCMs), thus being able to absorb the heat released during the CO 2 adsorption with minimal temperature change. 155 Clearly, the dilution of the active phase (i.e., the adsorbent material) with the PCMs causes an unavoidable reduction of the volumetric CO 2 adsorption capacity (i.e., amount of CO 2 adsorbed per volume of reactor), thus still constituting a major challenge for this approach. Obviously, an increase of the volume and costs of the reactor is caused by both of these approaches.…”

“…However, this solution may cause increased heating/cooling time as a result of the poor heat transfer coefficients of fixed bed reactors . Another viable approach is represented by the development of sorbent particles embedded with phase change materials (PCMs), thus being able to absorb the heat released during the CO 2 adsorption with minimal temperature change . Clearly, the dilution of the active phase (i.e., the adsorbent material) with the PCMs causes an unavoidable reduction of the volumetric CO 2 adsorption capacity (i.e., amount of CO 2 adsorbed per volume of reactor), thus still constituting a major challenge for this approach.…”

Review on Reactor Configurations for Adsorption-Based CO2 Capture

“…Various efforts have been made to tackle the heat wave issue encountered in a fixed bed reactor configuration using two different approaches namely external and internal thermal management. The first approach is based on the use of smartly designed adsorbent particles that can absorb the released heat with minimal temperature change by embedding phase change materials (PCMs) into the adsorbent particle . The main challenge associated with this approach is the dilution of the active adsorbent material with the PCMs which leads to a decrease in the absolute capacity (moles of CO 2 adsorbed/m 3 of the reactor).…”

“…Convective heat transfer from the gas phase to the surface of the particle (h i = 20−50 W/(m 2 K)) 32 Diffusion of CO 2 inside the pores of the particle (k LDF = 0.06 s −1 ; D e = 5.35 × 10 −5 m 2 /s at 301 K and 20% CO 2 in N 2 for 13X Zeolite) 33 Heat transfer from surface to the inside pores of the adsorbent particle (k f = 0.259 W/(m K) for ion-exchange resin with a primary benzy sorbent) 34 Heat transfer from the heat transfer fluid to the gas phase (applicable in indirect heating cases (h i = ∼10 W/(m 2 K)) 32 materials (PCMs) into the adsorbent particle. 39 The main challenge associated with this approach is the dilution of the active adsorbent material with the PCMs which leads to a decrease in the absolute capacity (moles of CO 2 adsorbed/m 3 of the reactor). The second approach uses a heat exchanger inserted in the reactor to remove the heat of adsorption, but it suffers from a long heating/cooling time because of the poor heat transfer properties of fixed bed reactors and is therefore not considered a viable option.…”

Ανάπτυξη Νέων Σύνθετων Υλικών Βιοπολυμερούς-Βιοκεραμικού Για Εφαρμογές Ιστομηχανικής

“…Αυτός είναι και ο βασικότερος λόγος που πειραματικές μετρήσεις της ενθαλπίας προσρόφησης ή ρόφησης αερίων σε στερεά είναι περιορισμένες. Συνήθως γίνεται προσπάθεια να μετρηθεί η θερμική μεταβολή που προκαλείται από την είσοδο του αερίου στο κελί, έτσι ώστε να αφαιρεθεί από τη θερμική μεταβολή που θα μετρηθεί κατά τη διάρκεια της ρόφησης (που οφείλεται στην είσοδο του αερίου και στη ρόφηση του)(Banerjee et al 1997, Sircar et al 1999, Meljac et al 2007.…”