Elucidating the role of particle downsizing in offretite zeolites for dynamic CO2/N2 separation
Abstract
Zeolites are promising selective CO₂ adsorbents, but their performance is often limited by diffusion constraints. Here, we explore the utilization of a large-pore offretite-type zeolite prepared from an organic-free precursor mixture as an adsorbent in dynamic CO 2 separation. Furthermore, by applying a one-dimensional pressure downsizing approach, nano-sized offretite zeolite composed of particles <200 nm (OFF-200) was produced from the parent micron-sized offretite of 2000 nm (OFF-2000). The performance of the nano-sized OFF-200 in the separation of dilute CO 2 from N 2 was comprehensively compared to that of the micron-sized OFF-2000, both possessing identical chemical compositions but differing in particle size. Breakthrough curve analysis of these samples was conducted in order to understand the CO 2 diffusion behaviour of the samples with different particle sizes. The greater CO 2 separation performance of OFF-200 in terms of higher CO 2 selectivity and faster kinetics is attributed to the more rapid diffusion and improved accessibility of the adsorption sites. The weaker strength of the adsorption sites of OFF-200 at low CO 2 coverage results in a higher proportion of desorbed CO 2 , leading to a more efficient separation cycle. The OFF-200 achieved a higher estimated monthly CO 2 removal (1039 vs 850 mmol g −1 month −1 at 60 °C), highlighting the potential of nano-sized OFF as a solid adsorbent for CO 2 separation.
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BibTeX
@article{wang2026elucidating,
title = {{Elucidating the role of particle downsizing in offretite zeolites for dynamic CO2/N2 separation}},
author = {Risheng Wang and Sajjad Ghojavand and Edwin Clatworthy and Diógenes Honorato Piva and Marie Desmurs and Valérie Ruaux and Svetlana Mintova},
journal = {Chemical engineering journal. Green and sustainable},
year = {2026},
month = nov,
doi = {10.1016/j.cejgas.2026.100036},
url = {https://hal.science/hal-05854906v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Elucidating the role of particle downsizing in offretite zeolites for dynamic CO2/N2 separation
AU - Risheng Wang
AU - Sajjad Ghojavand
AU - Edwin Clatworthy
AU - Diógenes Honorato Piva
AU - Marie Desmurs
AU - Valérie Ruaux
AU - Svetlana Mintova
PY - 2026
DA - 2026/11/06
JO - Chemical engineering journal. Green and sustainable
DO - 10.1016/j.cejgas.2026.100036
UR - https://hal.science/hal-05854906v1
AB - Zeolites are promising selective CO₂ adsorbents, but their performance is often limited by diffusion constraints. Here, we explore the utilization of a large-pore offretite-type zeolite prepared from an organic-free precursor mixture as an adsorbent in dynamic CO 2 separation. Furthermore, by applying a one-dimensional pressure downsizing approach, nano-sized offretite zeolite composed of particles <200 nm (OFF-200) was produced from the parent micron-sized offretite of 2000 nm (OFF-2000). The performance of the nano-sized OFF-200 in the separation of dilute CO 2 from N 2 was comprehensively compared to that of the micron-sized OFF-2000, both possessing identical chemical compositions but differing in particle size. Breakthrough curve analysis of these samples was conducted in order to understand the CO 2 diffusion behaviour of the samples with different particle sizes. The greater CO 2 separation performance of OFF-200 in terms of higher CO 2 selectivity and faster kinetics is attributed to the more rapid diffusion and improved accessibility of the adsorption sites. The weaker strength of the adsorption sites of OFF-200 at low CO 2 coverage results in a higher proportion of desorbed CO 2 , leading to a more efficient separation cycle. The OFF-200 achieved a higher estimated monthly CO 2 removal (1039 vs 850 mmol g −1 month −1 at 60 °C), highlighting the potential of nano-sized OFF as a solid adsorbent for CO 2 separation.
SN - 3051-0031
SN - 3051-0031
ER -