Accelerated CO2 capture on adsorbent coated finned tube: An experimental study

Highlights: • A novel apparatus is developed for fast cycle CO₂ ad/desorption by coating 13X powder on external surface of a finned tube. • The ad/desorption of CO₂ is well accelerated and the ad/desorption time is reduced to 14 s. • A criterion is developed to estimate the working capacity of the system. -- Abstract: In this study, the external surface of a finned tube was coated by 13X zeolite powder, and the CO₂ adsorption equilibrium and dynamics were investigated experimentally. A slurry consisting of dionized water, 13X zeolite powder, and Acrylic latex emulsion (ALE) was used to coat the finned tube. The finned tube was coated by deep coating method. The equilibrium isotherms were measured at the range of 20–90 °C and fitted well by the dual-site Langmuir model. The average difference between the model and the results obtained from the experiments is about 2.5%. The nitrogen adsorption/desorption at 77 K was used for characterization of adsorbents. A 11% reduction was observed in pore volume and surface area. The dynamic test showed that the desorption of adsorbed CO₂ takes place in about 14 s which is an order of magnitude faster than the fastest developed method. A conservative criterion was developed for estimating adsorbent working capacity. This criterion showed that the working capacities of the adsorbent are about 80% of its ideal values.