Abstract
Deca-dodecasil 3 rhombohedral (DDR3) membrane has received much attention in CO2 separation from small gas molecules because of its molecular sieving property and stable characteristics. Therefore, the present work is focusing on the utilization of previously fabricated membrane (synthesized in 3 days as reported in our previous work) to study the effect of hydrocarbons and its durability at the previously optimized conditions. Subsequently, gas permeation study was conducted on the DDR3 membrane in CO2 separation from small gas molecules and it was found that the permeance of H2, CO2, N2, and CH4 decreased in the order of H2 > CO2 > N2 > CH4, according to the increase in kinetic diameter of these gas molecules. Besides, it was observed that the ideal selectivities of the gas pairs decreased in the sequence of CO2/CH4 > CO2/N2 > H2/CO2. On the other hand, it was found that the presence of hydrocarbon impurities in the gas mixture containing CO2 and CH4 has directly affected the performance of DDR3 membrane and contributed to the losses of CO2 permeability, CH4 permeability, and CO2/CH4 selectivity of 39.1%, 14.8%, and 4.2%, respectively. Consequently, from the stability test, the performance of DDR3 membrane remained stable for 96 h, even after the separation testing using CO2 and CH4 gas mixture containing hydrocarbon impurities.
Highlights
Over the last few decades, much research has been done on the CO2 separation especially in syngas production and natural gas purification
The significant XRD peaks and FESEM images obtained from the resultant membrane showed comparable crystallinity and hexagonal morphology which are analogous with those findings documented in the researches for DDR3 membrane [9, 10, 25, 26]
It was found that the DDR3 membrane demonstrated an ideal selectivity of 5.22 for CO2/CH4 which was higher than the ideal selectivity of H2/CO2 and CO2/N2 gas pairs
Summary
Over the last few decades, much research has been done on the CO2 separation especially in syngas production (mainly H2) and natural gas purification. The presence of CO2 in the syngas reduces the yield of hydrogen and methane recovery during the Fischer-Tropsch (FT) process [1, 2]. The presence of CO2 decreases the heating value of natural gas and caused equipment corrosion in the existence of water [3, 4]. H2/CO2 selectivity CO2/CH4 selectivity CO2/N2 selectivity CO2 permeance (mol/m2sPa) Ref. Wang and his coworkers [14] from small gas molecules at mHo2/lC/mO22sPsae,leactnidvity70o, f
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