A flow through behavior of gas across meso-porous membranes

Martunus,; Helwani, Zuchra; Wiheeb, Ahmed Daham; Kim, Jinsoo; Othman, Mohd Roslee

doi:10.1016/j.micromeso.2012.06.053

Cited by 7 publications

(1 citation statement)

References 26 publications

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“…Wu et al (Wu et al, 2013) reported a decrease of approximately 7% in CO 2 adsorption capacity after ten cycles of CO 2 adsorption followed by humid helium flushing. Martunus et al observed a significant drop in CO 2 capacity after 39 cycles of CO 2 adsorption/N 2 flushing, and a gradual decrease after 51 cycles of humid CO 2 adsorption followed by steam purge (Martunus et al, 2012), while Selow et al found stable cyclic capacity for K 2 CO 3 -promoted hydrotalcite after 250 cycles of humid CO 2 / steam rinse (Van Selow et al, 2009a). The stability of potassiumpromoted hydrotalcite during multiple repetitive cycles of adsorption and desorption as well as the mechanisms determining the instability remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Stability of potassium-promoted hydrotalcites for CO2 capture over numerous repetitive adsorption and desorption cycles

Xin,

Boon,

van Dijk

et al. 2024

Front. Chem. Eng.

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Hydrotalcite-based adsorbents have demonstrated their potential for CO2 capture, particularly in the sorption-enhanced water-gas shift (SEWGS) process. This study aims to investigate the long-term stability of a potassium-promoted hydrotalcite-based adsorbent (KMG30) over many repetitive cycles under various operating conditions. The stability of the adsorbent, both in terms of its structure and sorption capacity, is examined through multiple consecutive adsorption and desorption cycles. However, it is observed that the capacity for CO2 adsorption decreases when subjected to many repeated cycles of CO2 adsorption followed by N2 flushing, or to many repeated cycles of H2O adsorption followed by N2 flushing. In-depth investigations employing various techniques such as thermogravimetric experiments, XRD, BET, and SEM-EDX analyses were conducted to elucidate the underlying phenomena that can explain this observed behavior. The former can be attributed to aggregation of K2CO3 from the sorbent during the CO2 adsorption and N2 flushing cycles (which can be reversed by re-dispersing the K2CO3 either by exposure to air or by processing the sorbent with cycles of CO2/H2O adsorption followed by N2 flushing), whereas the latter is ascribed to the only partial regeneration of the reactive site (referred to site C in earlier work), most likely associated with K2CO3 modification on MG30. In this case, morphological changes were found to be insignificant. Remarkable stability of KMG30, as known from SEWGS process studies, was confirmed during cycles of CO2 adsorption/steam purge. These findings significantly enhance our understanding of the stability of potassium-promoted hydrotalcite-based adsorbents and provide valuable insights for the design of diverse sorption processes.

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Section: Introductionmentioning

confidence: 99%