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Characterizing nonzeolitic pores in MFI membranes / Yu Miao in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3943–3948 Titre : Characterizing nonzeolitic pores in MFI membranes Type de document : texte imprimé Auteurs : Yu Miao, Auteur ; Falconer, John L., Auteur ; Richard D. Noble, Auteur Année de publication : 2008 Article en page(s) : p. 3943–3948 Note générale : Bibliogr. p. 3947-3948 Langues : Anglais (eng) Mots-clés : n-hexane;  MFI  zeolite  membranes Résumé : Methods that use n-hexane (n-hexane permporosimetry and n-hexane/2,2-dimethylybutane (DMB) separation) are shown to not be effective for characterizing MFI zeolite membranes because n-hexane adsorption swells MFI crystals and shrinks the size of nonzeolitic pores. Measurements on a membrane in which 30% of its helium flux at 300 K was through nonzeolitic pores demonstrate that benzene permporosimetry and isooctane vapor permeation as a function of feed activity provide better characterizations. Isooctane condensed in nonzeolitic pores at high activities, and this was used to estimate the sizes of those pores. The average nonzeolitic pore size in this membrane decreased from approximately 3.0 to 1.5 nm as the temperature increased from 300 to 348 K, apparently due to thermal expansion of MFI crystals. Benzene permporosimetry yielded dramatically different results from n-hexane permporosimetry because benzene does not swell the MFI crystals significantly. Single-component pervaporation fluxes as a function of molecular kinetic diameter verified the results from benzene permporosimetry. Larger molecules had higher fluxes than n-hexane because they diffused through nonzeolitic pores that were shrunk by n-hexane adsorption. Nonzeolitic pores were estimated to account for only 0.5% of the membrane permeation area, but 30% of the helium flux, because these pores were significantly larger than MFI pores. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071577t [article] Characterizing nonzeolitic pores in MFI membranes [texte imprimé] / Yu Miao, Auteur ; Falconer, John L., Auteur ; Richard D. Noble, Auteur . - 2008 . - p. 3943–3948. Bibliogr. p. 3947-3948 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3943–3948 Mots-clés : n-hexane;  MFI  zeolite  membranes Résumé : Methods that use n-hexane (n-hexane permporosimetry and n-hexane/2,2-dimethylybutane (DMB) separation) are shown to not be effective for characterizing MFI zeolite membranes because n-hexane adsorption swells MFI crystals and shrinks the size of nonzeolitic pores. Measurements on a membrane in which 30% of its helium flux at 300 K was through nonzeolitic pores demonstrate that benzene permporosimetry and isooctane vapor permeation as a function of feed activity provide better characterizations. Isooctane condensed in nonzeolitic pores at high activities, and this was used to estimate the sizes of those pores. The average nonzeolitic pore size in this membrane decreased from approximately 3.0 to 1.5 nm as the temperature increased from 300 to 348 K, apparently due to thermal expansion of MFI crystals. Benzene permporosimetry yielded dramatically different results from n-hexane permporosimetry because benzene does not swell the MFI crystals significantly. Single-component pervaporation fluxes as a function of molecular kinetic diameter verified the results from benzene permporosimetry. Larger molecules had higher fluxes than n-hexane because they diffused through nonzeolitic pores that were shrunk by n-hexane adsorption. Nonzeolitic pores were estimated to account for only 0.5% of the membrane permeation area, but 30% of the helium flux, because these pores were significantly larger than MFI pores. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071577t

Correlation of crystal lattice expansion and membrane properties for MFI zeolites / Stephanie G. Sorenson in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10021–10024 Titre : Correlation of crystal lattice expansion and membrane properties for MFI zeolites Type de document : texte imprimé Auteurs : Stephanie G. Sorenson, Auteur ; Joseph R. Smyth, Auteur ; Richard D. Noble, Auteur Année de publication : 2010 Article en page(s) : pp. 10021–10024 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : MFI  zeolites  Correlation  X-ray  diffraction  measurements Résumé : X-ray diffraction measurements show that saturation loadings of C5−C13 n-alkanes at room temperature increased the unit cell size of silicalite-1 crystals, and the percent volume expansion correlated linearly with the number of carbon atoms per unit cell. Adsorption of tridecane expanded the zeolite the most (1.53 vol %), but all n-alkanes and alcohols studied expanded MFI crystals. Pervaporation fluxes of isooctane through defects in B-ZSM-5 membranes at 313 K decreased 2 orders of magnitude when n-alkanes were added to the feed, and the percentage decrease correlated with crystal expansion; n-alkanes that expanded crystals more caused the flux through defects to decrease more. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901073g [article] Correlation of crystal lattice expansion and membrane properties for MFI zeolites [texte imprimé] / Stephanie G. Sorenson, Auteur ; Joseph R. Smyth, Auteur ; Richard D. Noble, Auteur . - 2010 . - pp. 10021–10024. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10021–10024 Mots-clés : MFI  zeolites  Correlation  X-ray  diffraction  measurements Résumé : X-ray diffraction measurements show that saturation loadings of C5−C13 n-alkanes at room temperature increased the unit cell size of silicalite-1 crystals, and the percent volume expansion correlated linearly with the number of carbon atoms per unit cell. Adsorption of tridecane expanded the zeolite the most (1.53 vol %), but all n-alkanes and alcohols studied expanded MFI crystals. Pervaporation fluxes of isooctane through defects in B-ZSM-5 membranes at 313 K decreased 2 orders of magnitude when n-alkanes were added to the feed, and the percentage decrease correlated with crystal expansion; n-alkanes that expanded crystals more caused the flux through defects to decrease more. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901073g

Effect of anion on gas separation performance of polymer−room-temperature Ionic liquid composite membranes / Jason E. Bara ; Douglas L. Gin ; Richard D. Noble in Industrial & engineering chemistry research, Vol. 47 n°24 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 9919–9924 Titre : Effect of anion on gas separation performance of polymer−room-temperature Ionic liquid composite membranes Type de document : texte imprimé Auteurs : Jason E. Bara, Auteur ; Douglas L. Gin, Auteur ; Richard D. Noble, Auteur Année de publication : 2009 Article en page(s) : p. 9919–9924 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gas  Separation  Performance  of  Polymer  photopolymerization Résumé : Composite gas separation membranes were fabricated by photopolymerization of a room-temperature ionic liquid (RTIL) monomer in the presence of 20 mol % of nonpolymerizable RTILs with various anions. The solid, composite membranes contained polymer-bound cations, “free” cations, and “free” anions. The composite materials exhibit no phase separation between these components. The permeabilities of CO2, N2, and CH4 in these poly(RTIL)−RTIL composites were observed to increase by 2−5 times relative to those in the neat poly(RTIL) without a “free” RTIL component. These largely increased permeabilities resulted in CO2/N2 and CO2/CH4 ideal separation selectivities that were only slightly diminished relative to the poly(RTIL) without a “free” RTIL. When viewed on “Robeson plots”, poly(RTIL)−RTIL composites are shown to be more favorable for CO2/N2 separation than CO2/CH4. Poly(RTIL)−RTIL composites are highly tunable materials with excellent promise as gas separation membranes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801019x [article] Effect of anion on gas separation performance of polymer−room-temperature Ionic liquid composite membranes [texte imprimé] / Jason E. Bara, Auteur ; Douglas L. Gin, Auteur ; Richard D. Noble, Auteur . - 2009 . - p. 9919–9924. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 9919–9924 Mots-clés : Gas  Separation  Performance  of  Polymer  photopolymerization Résumé : Composite gas separation membranes were fabricated by photopolymerization of a room-temperature ionic liquid (RTIL) monomer in the presence of 20 mol % of nonpolymerizable RTILs with various anions. The solid, composite membranes contained polymer-bound cations, “free” cations, and “free” anions. The composite materials exhibit no phase separation between these components. The permeabilities of CO2, N2, and CH4 in these poly(RTIL)−RTIL composites were observed to increase by 2−5 times relative to those in the neat poly(RTIL) without a “free” RTIL component. These largely increased permeabilities resulted in CO2/N2 and CO2/CH4 ideal separation selectivities that were only slightly diminished relative to the poly(RTIL) without a “free” RTIL. When viewed on “Robeson plots”, poly(RTIL)−RTIL composites are shown to be more favorable for CO2/N2 separation than CO2/CH4. Poly(RTIL)−RTIL composites are highly tunable materials with excellent promise as gas separation membranes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801019x

Effect of “free” cation substituent on gas separation performance of polymer−room-temperature Ionic liquid composite membranes / Jason E. Bara in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4607–4610 Titre : Effect of “free” cation substituent on gas separation performance of polymer−room-temperature Ionic liquid composite membranes Type de document : texte imprimé Auteurs : Jason E. Bara, Auteur ; Richard D. Noble, Auteur ; Douglas L. Gin, Auteur Année de publication : 2009 Article en page(s) : pp. 4607–4610 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Room-temperature  ionic  liquid  Imidazolium  cation  poly(RTIL)  matrix Résumé : Room-temperature ionic liquid (RTIL) based monomers were photopolymerized in the presence of nonpolymerizable RTILs with various types of organic functional groups attached to the imidazolium cation. Groups employed include alkyl, ether, nitrile, fluoroalkyl, and siloxane functionalities. This straightforward method allows for a broad range of functional groups to be incorporated into poly(RTIL) matrices without the need to develop new monomers. The resultant poly(RTIL)−RTIL composites were homogeneous, optically transparent solids that exhibited no signs of phase separation, even after many months of storage. As thin films, poly(RTIL)−RTIL composites were utilized as gas separation membranes and tested for their permeabilities to CO2, N2, and CH4. The presence of 20 mol % “free” RTIL within the poly(RTIL) matrix was shown to increase CO2 permeability by ∼100−250% relative to the neat poly(RTIL) membrane with no free RTIL component. The nature of the organic functional group associated with the free RTIL cation can influence both gas permeability and CO2/N2 and CO2/CH4 selectivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801897r [article] Effect of “free” cation substituent on gas separation performance of polymer−room-temperature Ionic liquid composite membranes [texte imprimé] / Jason E. Bara, Auteur ; Richard D. Noble, Auteur ; Douglas L. Gin, Auteur . - 2009 . - pp. 4607–4610. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4607–4610 Mots-clés : Room-temperature  ionic  liquid  Imidazolium  cation  poly(RTIL)  matrix Résumé : Room-temperature ionic liquid (RTIL) based monomers were photopolymerized in the presence of nonpolymerizable RTILs with various types of organic functional groups attached to the imidazolium cation. Groups employed include alkyl, ether, nitrile, fluoroalkyl, and siloxane functionalities. This straightforward method allows for a broad range of functional groups to be incorporated into poly(RTIL) matrices without the need to develop new monomers. The resultant poly(RTIL)−RTIL composites were homogeneous, optically transparent solids that exhibited no signs of phase separation, even after many months of storage. As thin films, poly(RTIL)−RTIL composites were utilized as gas separation membranes and tested for their permeabilities to CO2, N2, and CH4. The presence of 20 mol % “free” RTIL within the poly(RTIL) matrix was shown to increase CO2 permeability by ∼100−250% relative to the neat poly(RTIL) membrane with no free RTIL component. The nature of the organic functional group associated with the free RTIL cation can influence both gas permeability and CO2/N2 and CO2/CH4 selectivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801897r

High water vapor flun membranes based on novel diol − imidazolium polymers / Andrew L. LaFrate in Industrial & engineering chemistry research, Vol. 49 N° 23 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 11914–11919 Titre : High water vapor flun membranes based on novel diol − imidazolium polymers Type de document : texte imprimé Auteurs : Andrew L. LaFrate, Auteur ; Douglas L. Gin, Auteur ; Richard D. Noble, Auteur Année de publication : 2011 Article en page(s) : pp. 11914–11919 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymers Résumé : A breathable membrane that demonstrates high water vapor flux was prepared using a diol-functionalized polymerizable room temperature ionic liquid. A novel monomer material was synthesized and used to fabricate thin films which were tested for their ability to transport water vapor. These materials were tested beside commercial breathable polymers for comparison. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100227h [article] High water vapor flun membranes based on novel diol − imidazolium polymers [texte imprimé] / Andrew L. LaFrate, Auteur ; Douglas L. Gin, Auteur ; Richard D. Noble, Auteur . - 2011 . - pp. 11914–11919. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 11914–11919 Mots-clés : Polymers Résumé : A breathable membrane that demonstrates high water vapor flux was prepared using a diol-functionalized polymerizable room temperature ionic liquid. A novel monomer material was synthesized and used to fabricate thin films which were tested for their ability to transport water vapor. These materials were tested beside commercial breathable polymers for comparison. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100227h

Room-temperature ionic liquids / Alexia Finotello in Industrial & engineering chemistry research, Vol. 47 N°10 (Mai 2008) 

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ZSM-11 Membranes: characterization and pervaporation performance / Li, Shiguang in Aiche journal, Vol. 48 N°2 (Fevrier 2002) 

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