Polyethyleneimine-Modified MCM-48 Membranes: Effect of Water Vapor and Feed Concentration on N2/CO2 Selectivity

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• 作者：Parveen Kumar ; Sangil Kim ; Junichi Ida ; Vadim V. Guliants
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2008
• 出版时间：January 2, 2008
• 年：2008
• 卷：47
• 期：1
• 页码：201 - 208
• 全文大小：167K
• 年卷期：v.47,no.1(January 2, 2008)
• ISSN：1520-5045

文摘

Ordered mesoporous MCM-48 membranes with cubic pore structure were prepared by the solution growthmethod on symmetric -alumina supports using cetyltrimethylammonium bromide as a surfactant. Thesurfactant was removed by Soxhlet extraction using an ethanol/HCl mixture to synthesize defect-free MCM-48 membranes as confirmed by N₂ unsteady-state permeation. MCM-48 membranes and powders weresuccessfully modified with a polymer, polyethyleneimine (PEI) containing amino groups as confirmed by N₂adsorption-desorption data, X-ray diffraction, Thermo gravimetric analysis (TGA), and N₂ unsteady-statepermeation experiments. The PEI/MCM-48 membranes were permeable to N₂ after pore modification,suggesting incomplete filling of MCM-48 pores by PEI, which was confirmed by the N₂ adsorption-desorptionexperiments on the bulk PEI/MCM-48 powder. The PEI-modified MCM-48 membranes were highly selectiveto N₂ permeation from N₂/CO₂ mixtures at room temperature in the presence of ~2.6% water vapor. Binary-gas N₂/CO₂ permeation data for the PEI-modified MCM-48 membranes showed much-higher N₂ permeanceas compared to CO₂ permeance in the presence of water vapor. The selectivities increased with CO₂concentration in the feed, and selectivities greater than 80 were observed. The N₂/CO₂ selectivities diminishedsignificantly at 363 K for the PEI/MCM-48 membranes.