TY - JOUR
T1 - Effect of gas molecule affinities on CO2 separation from the CO2/N2 gas mixture using inorganic membranes as investigated by molecular dynamics simulation
AU - Takaba, H.
AU - Mizukami, K.
AU - Kubo, Momoji
AU - Stirling, A.
AU - Miyamoto, Akira
PY - 1996/12/11
Y1 - 1996/12/11
N2 - Applying molecular dynamics simulation and computer graphics methods we have investigated the dynamic behavior of the separation process of CO2 from the CO2/N2 gas mixture in inorganic membranes at high temperatures. We have demonstrated that the permeation dynamics follows the Knudsen diffusion mechanism in our model system that has a slit-like pore of 6.3 Å. We have analyzed the effect of affinities of gas molecules for the membrane wall on the permeation to predict the optimal affinity strength for high selectivity of CO2. Our results indicate that in the model with the 600 K and 200 K affinities for CO2 and N2, respectively, we can obtain a high selectivity of CO2 even if the temperature is 1073 K. It is also shown that there is an optimal range for the CO2 affinity for the membrane wall to achieve good separation, which was estimated as the range of 400-600 K in our system, if the affinity of N2 is always weaker than that of CO2.
AB - Applying molecular dynamics simulation and computer graphics methods we have investigated the dynamic behavior of the separation process of CO2 from the CO2/N2 gas mixture in inorganic membranes at high temperatures. We have demonstrated that the permeation dynamics follows the Knudsen diffusion mechanism in our model system that has a slit-like pore of 6.3 Å. We have analyzed the effect of affinities of gas molecules for the membrane wall on the permeation to predict the optimal affinity strength for high selectivity of CO2. Our results indicate that in the model with the 600 K and 200 K affinities for CO2 and N2, respectively, we can obtain a high selectivity of CO2 even if the temperature is 1073 K. It is also shown that there is an optimal range for the CO2 affinity for the membrane wall to achieve good separation, which was estimated as the range of 400-600 K in our system, if the affinity of N2 is always weaker than that of CO2.
KW - Affinity membranes
KW - CO removal
KW - Gas separation
KW - Inorganic membranes
KW - Molecular dynamics simulation
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U2 - 10.1016/S0376-7388(96)00193-7
DO - 10.1016/S0376-7388(96)00193-7
M3 - Article
AN - SCOPUS:0030580468
VL - 121
SP - 251
EP - 259
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
SN - 0376-7388
IS - 2
ER -