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Ye, Pengcheng
Publications (10 of 18) Show all publications
Korelskiy, D., Ye, P., Nabavi, M. S. & Hedlund, J. (2017). Selective blocking of grain boundary defects in high-flux zeolite membranes by cokin. Journal of Materials Chemistry A, 5(16), 7295-7299
Open this publication in new window or tab >>Selective blocking of grain boundary defects in high-flux zeolite membranes by cokin
2017 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 5, no 16, p. 7295-7299Article in journal (Refereed) Published
Abstract [en]

Commercial application of zeolite membranes has been hindered by the challenge of preparing defect-free membranes. Herein, we report a facile method able to selectively plug grain boundary defects in high-flux MFI zeolite membranes by coking of iso-propanol at 350 °C. After modification, the permeance via defects was reduced by 70%, whereas that via zeolite pores was reduced by only 10%.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-62738 (URN)10.1039/C7TA01268C (DOI)000399390300006 ()2-s2.0-85017599078 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-04-25 (andbra)

Available from: 2017-03-28 Created: 2017-03-28 Last updated: 2019-11-26Bibliographically approved
Yu, L., Grahn, M., Ye, P. & Hedlund, J. (2017). Ultra-thin MFI membranes for olefin/nitrogen separation. Journal of Membrane Science, 524, 428-435
Open this publication in new window or tab >>Ultra-thin MFI membranes for olefin/nitrogen separation
2017 (English)In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 524, p. 428-435Article in journal (Refereed) Published
Abstract [en]

The recovery of light hydrocarbons such as propylene and ethylene from vent streams in polymer plants is desirable since it opens up for more efficient conversion of the monomers with high economic value. Consequently, polymer membrane vapour-gas separation systems have been used for this purpose for decades [1,2]. However, an alternative is zeolite membranes. In this work, ultra-thin MFI zeolite membranes (0.5 µm) were used to separate propylene or ethylene from binary 20/80 olefin/nitrogen mixtures at different temperatures. The membranes were olefin selective with high permeance at all investigated temperatures. At room temperature, the permeance of propylene was 22×10-7 mol m-2 s-1 Pa-1 and the separation factor was 43, which corresponds to a separation selectivity of around 80. For a mixture of 20 mol.% ethylene in nitrogen, the maximum separation factor was 6 (corresponds to a separation selectivity of 8.4) at 277 K with an ethylene permeance of 57×10-7 mol m-2 s-1 Pa-1. The membrane selectivity was governed by more extensive adsorption of olefin, especially propylene, as compared to nitrogen. Comparing with ethylene, propylene has higher heat of adsorption, which probably caused the higher propylene/nitrogen selectivity compared to ethylene/nitrogen selectivity. The permeance and the selectivity for propylene were much higher than for commercial polymeric membranes. For ethylene, the permeance was much higher, and the selectivity was comparable to commercial polymeric membranes. Modelling showed that the pressure drop over the support limited the flux through the membranes especially at higher temperatures and in particular for the ethylene/nitrogen system with high flux. Further, modelling indicated that the result obtained at high temperatures, where the flux was high, was also affected by concentration polarization. However, for the propylene/nitrogen system at the optimum separation temperature, the pressure drop over the support and the concentration polarisation were small. The results show that ultra-thin MFI zeolite membranes are promising candidates for light olefins/nitrogen separation in polymer plants.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Chemical Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-60705 (URN)10.1016/j.memsci.2016.11.077 (DOI)000392769000045 ()2-s2.0-85002293040 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-03-02 (andbra)

Available from: 2016-11-27 Created: 2016-11-27 Last updated: 2018-09-13Bibliographically approved
Korelskiy, D., Grahn, M., Ye, P., Zhou, M. & Hedlund, J. (2016). A study of CO2/CO separation by sub-micron b-oriented MFI membranes (ed.). Paper presented at . RSC Advances, 6(70), 65475-65482
Open this publication in new window or tab >>A study of CO2/CO separation by sub-micron b-oriented MFI membranes
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2016 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 6, no 70, p. 65475-65482Article in journal (Refereed) Published
Abstract [en]

Separation of CO2 and CO is of great importance for many industrial applications. Today, CO2 is removed from CO mainly by adsorption or physical or chemical absorption systems that are energy-intensive and expensive. Membranes are listed among the most promising sustainable and energy-efficient alternatives for CO2 separation. Here, we study CO2/CO separation by novel sub-micron b-oriented MFI zeolite membranes in a temperature range of 258-303 K and at a feed pressure of 9 bar. Under all experimental conditions studied, the membranes were CO2-selective and displayed high CO2 permeance ranging from 17 000 to 23 000 gpu. With decreasing temperature, the CO2/CO selectivity was increasing, reaching a maximum of 26 at 258 K. We also developed a mathematical model to describe the membrane process, and it indicated that the membrane separation performance was a result of selective adsorption of CO2 on the polar zeolite. The heat of adsorption of CO2 on the zeolite is more negative due to the high quadrupole moment and polarisability of the molecule as compared to CO. At the same time, diffusional coupling (correlation effects) at high adsorbed loadings was found to favour the overall CO2/CO selectivity of the membranes by reducing the diffusivity of the lighter CO molecule in the ca. 0.55 nm pores in the zeolite. The model also indicated that the separation performance was limited by the mass transfer resistance in the support and concentration polarisation on the feed side of the membrane.

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-7211 (URN)10.1039/C6RA14544B (DOI)000379577800024 ()2-s2.0-84978766579 (Scopus ID)58af75f0-175a-4e0c-ba22-8052ab996b55 (Local ID)58af75f0-175a-4e0c-ba22-8052ab996b55 (Archive number)58af75f0-175a-4e0c-ba22-8052ab996b55 (OAI)
Note
Validerad; 2016; Nivå 2; 20160705 (dankor)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ye, P., Grahn, M., Korelskiy, D. & Hedlund, J. (2016). Efficient Separation of N2 and He at Low Temperature Using MFI Membranes (ed.). AIChE Journal, 62(8), 2833-2842
Open this publication in new window or tab >>Efficient Separation of N2 and He at Low Temperature Using MFI Membranes
2016 (English)In: AIChE Journal, ISSN 0001-1541, E-ISSN 1547-5905, Vol. 62, no 8, p. 2833-2842Article in journal (Refereed) Published
Abstract [en]

Ultra-thin MFI membranes were evaluated for N2/He separation over the temperature range of 85–260 K for the first time. The membranes were rather nitrogen selective at all the conditions investigated. A highest N2/He selectivity of 75.7 with a high N2 flux of 83 kg/m2/h was observed at 124 K. The separation was attributed to adsorption selectivity to N2, effectively hindering the transport of He in the zeolite pores. The exceedingly high permeance even at low temperatures was ascribed to the ultrathin (<1μm) membrane used. As the pressure ratios increased, a better separation performance was obtained. A mathematical model showed the largest difference of adsorbed loading over the film at ca. 120 K was the main reason for the observed maximum selectivity. Further, the modelling indicated the selectivity would increase 2–3 times by reducing the influence of defects, concentration polarization, and pressure drop over the support.

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-14246 (URN)10.1002/aic.15258 (DOI)000382986000022 ()2-s2.0-84963838612 (Scopus ID)d9915577-3ec2-44db-b44a-2716f7d3a5c3 (Local ID)d9915577-3ec2-44db-b44a-2716f7d3a5c3 (Archive number)d9915577-3ec2-44db-b44a-2716f7d3a5c3 (OAI)
Note

Validerad; 2016; Nivå 2; 20160330 (dankor)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ye, P. (2016). Zeolite Membrane Separation at Low Temperature (ed.). (Doctoral dissertation). Paper presented at . Luleå tekniska universitet
Open this publication in new window or tab >>Zeolite Membrane Separation at Low Temperature
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The energy consumption of separation processes accounts for a large part of the total energy consumption in chemical industry. Membrane separation processes require much less energy than the currently used thermally driven separation processes and could therefore reduce energy consumption in industry considerably. Today, most commercially available membranes are organic polymeric membranes. Inorganic zeolite membranes have several superiorities over polymeric membranes, e.g., higher flux and selectivity, higher chemical and thermal stability, and thus have great potential for a variety of gas and liquid separations. Whereas there have been extensive studies on zeolite membrane separation at high temperature during the past decades, scientific reports on the low temperature applications of zeolite membranes is extremely scarce and there are no reports at cryogenic temperature. This work is pioneering research on investigation of the performance of zeolite membranes for separation of various gas mixtures at unprecedentedly low temperature, down to cryogenic temperature. In the present work, zeolite membranes were, for the first time, evaluated for gas separation at cryogenic temperature. Air separation by ultra-thin MFI membranes was carried out at a feed pressure ranging from 100 mbar to 5 bar over the temperature range of 62–110 K. The membranes were found to be oxygen selective at all the conditions investigated. The observed results were well above the upper bound in the 2008 Robeson selectivity-permeability plot when the feed pressure was less than or equal to 1 bar. The O2/N2 separation factor reached 5.0 at 67 K and 100 mbar, with a high O2 permeance of 8.6 × 10-7 mol m-2 s-1 Pa-1. The performance of our membranes (in terms of selectivity) was comparable to that recently reported for promising polymeric membranes, but 100 times higher in terms of permeance and flux. The membrane selectivity was found to increase with decreasing temperature and feed pressure. The present work has therefore indicated the optimum conditions for air separation using MFI membranes, namely low feed pressures and cryogenic temperatures. A mathematical model showed that the selectivity to O2 emanated from O2/N2 adsorption selectivity. N2/He separation is essential for helium recovery from natural gas and helium reclamation for airships and submarines. Zeolite membranes were evaluated for this separation over the temperature range of 85–260 K, possessing high N2-selectivity at all the conditions investigated. When the feed pressure was 5 bar and the permeate pressure was 0.5 bar, a highest N2/He separation factor of 62 was observed at 124 K. The N2 permeance was rather high, up to 39 ×10−7 mol m−2 s−1 Pa−1. The separation was attributed to adsorption selectivity of the membranes to N2, effectively suppressing the transport of He in the zeolite pores and this effect was more significant at cryogenic temperature. A mathematical model showed that the largest difference of adsorbed loading over the film at ca. 120 K was probably the main reason for the observed maximum selectivity at this temperature. The model also indicated that the selectivity could even be increased by 2–3 times if the membrane was totally defect-free. This work demonstrates that a zeolite membrane process could be rather competitive for N2/He separation. Synthesis gas generated from biomass is a valuable, renewable resource that can be used for production of clean energy and various chemicals. It is mainly a mixture of CO, CO2, and H2. CO2 is an undesired component in the syngas and should, therefore, be removed. In this work, CO2 separation from H2 and CO using zeolite membranes was studied for at low temperatures, down to 235 K and at a feed pressure of 9 bar. The membrane performance in terms of both selectivity and flux was superior to that reported for the state-of-the-art polymeric and inorganic membranes. The highest separation factor was 202 for CO2/H2 separation at 235 K and 21 for CO2/CO separation at 258 K, significantly higher than that at room temperature. The observed CO2 flux was very high, i.e., 300-420 kg m-2 h-1, in the entire temperature range of 235–310 K. Initial cost estimation revealed that high flux zeolite membranes were economically competitive with the present commercial polymeric membranes. Moreover, the process relying on our zeolite membranes was shown to be appreciably more space-efficient. Efficient light olefins/N2 separation technologies are of great interest to recover monomers from N2 purge gas in polymer plants. C3H6/N2 and C2H4/ N2 separation were investigated using zeolite membranes in a temperature range of 258–356 K. The membranes were rather selective towards the hydrocarbons. For C3H6/N2 separation, a maximum separation factor of 43 was observed at room temperature with a C3H6 permeance of 22×10-7 mol m-2 s-1 Pa-1. For C2H4/N2 separation, the maximum separation factor was 6 at 277 K with a C2H4 permeance of 57×10-7 mol m-2 s-1 Pa-1. The findings reveal that zeolite membranes are promising candidates for light olefins/N2 separation in petrochemical processes. The adsorption properties dominate separation performance for systems studied in the present work. The high selectivity emanates from competitive adsorption, e.g., the strongly adsorbing components hinder the permeances of the weakly adsorbing ones and the effect was stronger at low temperature. In addition, gas permeances through zeolite membranes tend to decrease at low temperature most likely due to decreasing diffusivity, especially at cryogenic temperature. However, the permeances of our membranes even at low temperature were still one to two orders of magnitude higher than those reported for inorganic and polymeric membranes. Thus, the high-flux membranes have great superiority in this case. The fairly high permeance even at low temperatures was ascribed to the ultra-thin (< 1µm) film and highly permeable support used. We provide here a promising candidate, ultra-thin zeolite membranes, with high permeance and excellent selectivity for gas separation application at low temperature.

Place, publisher, year, edition, pages
Luleå tekniska universitet, 2016. p. 63
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-17447 (URN)36e434c7-43bc-4efb-80e1-f9d9712a9592 (Local ID)978-91-7583-557-0 (ISBN)978-91-7583-558-7 (ISBN)36e434c7-43bc-4efb-80e1-f9d9712a9592 (Archive number)36e434c7-43bc-4efb-80e1-f9d9712a9592 (OAI)
Note

Godkänd; 2016; 20160215 (penyex); Nedanstående person kommer att disputera för avläggande av teknologie doktorsexamen. Namn: Pengcheng Ye Ämne: Kemisk teknologi/Chemical Technology Avhandling: Zeolite Membrane Separation at Low Temperature Opponent: Professor Anne Julbe, European Institute of membranes (IEM), Frankrike. Ordförande: Professor Jonas Hedlund, Avd för kemiteknik, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet. Tid: Fredag 22 april 2016, kl 10.00 Plats: C305, Luleå tekniska universitet

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Ye, P., Korelskiy, D., Grahn, M. & Hedlund, J. (2015). Cryogenic air separation at low pressure using MFI membranes (ed.). Paper presented at . Journal of Membrane Science, 487, 135-140
Open this publication in new window or tab >>Cryogenic air separation at low pressure using MFI membranes
2015 (English)In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 487, p. 135-140Article in journal (Refereed) Published
Abstract [en]

Ultra-thin MFI membranes were for the first time evaluated for air separation at low feed pressures ranging from 100 to 1000 mbar at cryogenic temperature. The membrane separation performance at optimum temperature at all investigated feed pressures was well above the Robeson upper bound for polymeric membranes at near room temperature. The O2/N2 separation factor at optimum temperature increased as the feed pressure was decreased and reached 5.0 at 100 mbar feed pressure and a membrane temperature of 67 K. The corresponding membrane selectivity was 6.3, and the O2 permeance was as high as 8.6×10−7 mol m−2 s−1 Pa−1. This permeance was about 100 times higher than that reported for promising polymeric membranes. The membrane selectivity and high O2 permeance was most likely a result of O2/N2 adsorption selectivity. The increase in O2/N2 separation factor with decreasing pressure and temperature was probably due to increased adsorption selectivity at reduced temperature. This work has demonstrated the potential of MFI zeolite membranes for O2/N2 separations at cryogenic temperature.

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-10747 (URN)10.1016/j.memsci.2015.03.063 (DOI)000354490700015 ()2-s2.0-84928169403 (Scopus ID)99a46e1f-6cce-41c3-84db-bcca182f12bc (Local ID)99a46e1f-6cce-41c3-84db-bcca182f12bc (Archive number)99a46e1f-6cce-41c3-84db-bcca182f12bc (OAI)
Note
Validerad; 2015; Nivå 2; 20150316 (dankor)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Korelskiy, D., Ye, P., Fouladvand, S., Karimi, S., Sjöberg, E. & Hedlund, J. (2015). Efficient ceramic zeolite membranes for CO2/H2 separation (ed.). Paper presented at . Journal of Materials Chemistry A, 2015(3), 12500-12506
Open this publication in new window or tab >>Efficient ceramic zeolite membranes for CO2/H2 separation
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2015 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 2015, no 3, p. 12500-12506Article in journal (Refereed) Published
Abstract [en]

Membranes are considered one of the most promising technologies for CO2 separation from industrially important gas mixtures like synthesis gas or natural gas. In order for the membrane separation process to be efficient, membranes, in addition to being cost-effective, should be durable and possess high flux and sufficient selectivity. Current CO2-selective membranes are low flux polymeric membranes with limited chemical and thermal stability. In the present work, robust and high flux ceramic MFI zeolite membranes were prepared and evaluated for separation of CO2 from H2, a process of great importance to synthesis gas processing, in a broad temperature range of 235–310 K and at an industrially relevant feed pressure of 9 bar. The observed membrane separation performance in terms both selectivity and flux was superior to that previously reported for the state-of-the-art CO2-selective zeolite and polymeric membranes. Our initial cost estimate of the membrane modules showed that the present membranes were economically viable. We also showed that the ceramic zeolite membrane separation system would be much more compact than a system relying on polymeric membranes. Our findings therefore suggest that the developed high flux ceramic zeolite membranes have great potential for selective, cost-effective and sustainable removal of CO2 from synthesis gas.

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-10306 (URN)10.1039/C5TA02152A (DOI)000355736700047 ()2-s2.0-84930959021 (Scopus ID)91a22b0f-02d2-4414-8c78-7364ca1431e0 (Local ID)91a22b0f-02d2-4414-8c78-7364ca1431e0 (Archive number)91a22b0f-02d2-4414-8c78-7364ca1431e0 (OAI)
Note
Validerad; 2015; Nivå 2; 20150514 (dankor)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Zhou, M., Korelskiy, D., Ye, P., Grahn, M. & Hedlund, J. (2014). A Uniformly Oriented MFI Membrane for Improved CO2 Separation (ed.). Paper presented at . Angewandte Chemie, 126(13), 3560-3563
Open this publication in new window or tab >>A Uniformly Oriented MFI Membrane for Improved CO2 Separation
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2014 (English)In: Angewandte Chemie, ISSN 0044-8249, Vol. 126, no 13, p. 3560-3563Article in journal (Refereed) Published
Abstract [en]

Membrane separation of CO2 from natural gas, biogas, synthesis gas, and flu gas is a simple and energy-efficient alternative to other separation techniques. But results for CO2-selective permeance have always been achieved by randomly oriented and thick zeolite membranes. Thin, oriented membranes have great potential to realize high-flux and high-selectivity separation of mixtures at low energy cost. We now report a facile method for preparing silica MFI membranes in fluoride media on a graded alumina support. In the resulting membrane straight channels are uniformly vertically aligned and the membrane has a thickness of 0.5 μm. The membrane showed a separation selectivity of 109 for CO2/H2 mixtures and a CO2 permeance of 51×10−7 mol m−2 s−1 Pa−1 at −35 °C, making it promising for practical CO2 separation from mixtures

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-13946 (URN)10.1002/ange.201311324 (DOI)d43b3565-7127-4875-b266-b31760c069dd (Local ID)d43b3565-7127-4875-b266-b31760c069dd (Archive number)d43b3565-7127-4875-b266-b31760c069dd (OAI)
Note
Validerad; 2014; 20140304 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-04-04Bibliographically approved
Zhou, M., Korelskiy, D., Ye, P., Grahn, M. & Hedlund, J. (2014). A Uniformly Oriented MFI Membrane for Improved CO2 Separation (ed.). Paper presented at . Angewandte Chemie International Edition, 53(13), 3492-3495
Open this publication in new window or tab >>A Uniformly Oriented MFI Membrane for Improved CO2 Separation
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2014 (English)In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 53, no 13, p. 3492-3495Article in journal (Refereed) Published
Abstract [en]

Membrane separation of CO2 from natural gas, biogas, synthesis gas, and flu gas is a simple and energy-efficient alternative to other separation techniques. But results for CO2-selective permeance have always been achieved by randomly oriented and thick zeolite membranes. Thin, oriented membranes have great potential to realize high-flux and high-selectivity separation of mixtures at low energy cost. We now report a facile method for preparing silica MFI membranes in fluoride media on a graded alumina support. In the resulting membrane straight channels are uniformly vertically aligned and the membrane has a thickness of 0.5m. The membrane showed a separation selectivity of 109 for CO2/H-2 mixtures and a CO2 permeance of 51x10(-7)molm(-2)s(-1)Pa(-1) at -35 degrees C, making it promising for practical CO2 separation from mixtures

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-8218 (URN)10.1002/anie.201311324 (DOI)000333001500038 ()24590761 (PubMedID)2-s2.0-84896476984 (Scopus ID)6b024022-b777-4f2c-bc21-d8f500b889af (Local ID)6b024022-b777-4f2c-bc21-d8f500b889af (Archive number)6b024022-b777-4f2c-bc21-d8f500b889af (OAI)
Note
Godkänd; 2014; 20140424 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ye, P., Sjöberg, E. & Hedlund, J. (2014). Air Separation at Cryogenic Temperature Using MFI membranes (ed.). Paper presented at . Microporous and Mesoporous Materials, 192, 14-17
Open this publication in new window or tab >>Air Separation at Cryogenic Temperature Using MFI membranes
2014 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 192, p. 14-17Article in journal (Refereed) Published
Abstract [en]

In the present work, zeolite membranes were for the first time evaluated for separations at cryogenic temperatures. MFI membranes were evaluated with a feed of synthetic air, at varying feed pressures between 1– 5 bar and a sweep stream of helium at a constant pressure of 1 bar for temperatures in the range 77 to 110 K. When the feed pressure was 1 bar, the highest O2/N2 separation factor was 3.9, corresponding to a separation selectivity of 4.1, with an oxygen permeance of 6.7×10-7 mol m-2 s-1 Pa-1 at the optimum temperature 79 K. This membrane performance is just above the upper bound in the 2008 Robeson selectivity- permeability plot for polymeric membranes. As the feed pressure increased, the maximum separation factors for O2/N2 decreased while the optimum separation temperatures increased. It is inferred that the separation is governed by condensation and effective transport of oxygen in the zeolite pores under these conditions. However, the adsorption of nitrogen, and thereby the transport of nitrogen, likely increases as the pressure is increased, which reduce the selectivity. To test this hypothesis, the feed was diluted with 33% helium and the total feed pressure was maintained at 1 bar, corresponding to a partial pressure of air of 0.66 bar. In this case, the maximum separation factor increased to 4.3, which supports the proposed separation mechanism.

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-2449 (URN)10.1016/j.micromeso.2013.09.016 (DOI)000336713100004 ()2-s2.0-84900501247 (Scopus ID)0124ef99-455a-4ffb-a0cf-508c2f589740 (Local ID)0124ef99-455a-4ffb-a0cf-508c2f589740 (Archive number)0124ef99-455a-4ffb-a0cf-508c2f589740 (OAI)
Note
Validerad; 2014; Bibliografisk uppgift: Special issue devoted to the 6th International Zeolite Membrane Meeting; 20130919 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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