RT Journal Article
T1 Carbon molecular sieve membranes for water separation in CO2 hydrogenation reactions: 												Effect of the carbonization temperature
A1 Poto, Serena
A1 Aguirre, A.
A1 Huigh, F.
A1 Llosa-Tanco, Margot Anabell
A1 Pacheco-Tanaka, David Alfredo
A1 Gallucci, Fausto
A1 Neira d'Angelo, M. Fernanda
AB Carbon membranes are a potentially attractive candidate for the in-situ removal of water vapor in CO2 hydrogenation reactions. Their hydrophilicity and pore structure can be tuned by properly adjusting the synthesis procedure. Herein, we assess the effect of the carbonization temperature (450–750 °C) on the performance of supported CMSM in terms of vapor/gas separation, in correlation with changes in their surface functionality and porous structure. FTIR spectra showed that the nature of the functional groups changes with the evolution of the carbonization step, leading to a gradual loss in hydrophilicity (i.e., OH stretching disappears at Tcarb ≥ 600 °C). The extent of water adsorption displays an optimum at Tcarb of 500 °C, with the membrane carbonized at 650 °C being the least hydrophilic. We found that the pore size distribution strongly influences the water permeance. At all Tcarb, adsorption-diffusion (AD) is the dominant transport mechanisms. However, as soon as ultra-micropores appear (Tcarb: 600–700 °C) molecular sieving (MS) contributes to an increase in the water permeance, despites a loss in hydrophilicity. At Tcarb ≥ 750 °C, MS pores disappear, causing a drop in the water permeance. Finally, the permeance of different gases (N2, H2, CO, CO2) is mostly affected by the pore size distribution, with MS being the dominant mechanism over the AD, except for CO2. However, the extent and mechanism of gas permeation drastically change as a function of the water content in the feed, indicating that gas/vapor molecules need to compete to access the pores of the membranes.
SN 0376-7388
YR 2023
FD 2023-07-05
LK https://hdl.handle.net/11556/5214
UL https://hdl.handle.net/11556/5214
LA eng
NO Poto , S , Aguirre , A , Huigh , F , Llosa-Tanco , M A , Pacheco-Tanaka , D A , Gallucci , F & Neira d'Angelo , M F 2023 , ' Carbon molecular sieve membranes for water separation in CO 2 hydrogenation reactions : Effect of the carbonization temperature ' , Journal of Membrane Science , vol. 677 , 121613 . https://doi.org/10.1016/j.memsci.2023.121613
NO Publisher Copyright: © 2023 The Author(s)
NO This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 838014 (C2Fuel project).
DS TECNALIA Publications
RD 29 sept 2024