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Zhou, Han
Publications (10 of 11) Show all publications
Zhou, H., Mouzon, J., Farzaneh, A., Antzutkin, O., Grahn, M. & Hedlund, J. (2015). Colloidal Defect-Free Silicalite-1 Single Crystals: Preparation, Structure Characterization, Adsorption, and Separation Properties for Alcohol/Water Mixtures (ed.). Paper presented at . Langmuir, 31(30), 8488-8494
Open this publication in new window or tab >>Colloidal Defect-Free Silicalite-1 Single Crystals: Preparation, Structure Characterization, Adsorption, and Separation Properties for Alcohol/Water Mixtures
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2015 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 31, no 30, p. 8488-8494Article in journal (Refereed) Published
Abstract [en]

In this work, colloidal silicalite-1 single crystals are for the first time synthesized using fluoride as mineralizing agent at near neutral pH. SEM, TEM, DLS, XRD, solid-state 29Si MAS NMR, and adsorption/desorption experiments using nitrogen, water, n-butanol, and ethanol as adsorbates were used to characterize the crystals. The single crystals have a platelike habit with a length of less than 170 nm and an aspect ratio (length/width) of about 1.2, and the thickness of the crystals is less than 40 nm. Compared with silicalite-1 crystals grown using hydroxide as mineralizing agent, the amount of structural defects in the lattice is significantly reduced and the hydrophobicity is increased. Membrane separation and adsorption results show that the synthesized defect-free crystals present high selectivity to alcohols from alcohol/water mixtures. The n-butanol/water adsorption selectivities were ca. 165 and 14 for the defect-free crystals and a reference sample containing defects, respectively, illustrating the improvement in n-butanol/water selectivity by eliminating the polar silanol defects.

National Category
Chemical Process Engineering Physical Chemistry
Research subject
Chemical Technology; Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-7846 (URN)10.1021/acs.langmuir.5b02520 (DOI)000359278000034 ()2-s2.0-84938674785 (Scopus ID)64403f34-d43d-43de-9d6f-b5e17b81fbdc (Local ID)64403f34-d43d-43de-9d6f-b5e17b81fbdc (Archive number)64403f34-d43d-43de-9d6f-b5e17b81fbdc (OAI)
Note
Validerad; 2015; Nivå 2; 20150725 (magr)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Korelskiy, D., Ye, P., Zhou, H., Mouzon, J. & Hedlund, J. (2014). An experimental study of micropore defects in MFI membranes (ed.). Paper presented at . Microporous and Mesoporous Materials, 186, 194-200
Open this publication in new window or tab >>An experimental study of micropore defects in MFI membranes
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2014 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 186, p. 194-200Article in journal (Refereed) Published
Abstract [en]

In the present work, two ultra-thin MFI membranes, prepared using hydroxide and fluoride ions as mineralizing agents, respectively, were carefully examined by permporometry. The amount of micropore defects, as determined by permporometry, differed significantly between the two different membranes. For the first time, it was demonstrated that the micropore defects determined by permporometry were most likely open grain boundaries. The results were verified by direct observation of the open grain boundaries by a state-of-the-art XHR-scanning electron microscopy instrument. In addition, the permporometry data were also consistent with permeation data using 1,3,5-trimethylbenzene (TMB) as a probe molecule, separation data using an equimolar mixture of n-hexane and TMB, and nitrogen adsorption data.

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-2863 (URN)10.1016/j.micromeso.2013.12.002 (DOI)000330916600028 ()2-s2.0-84891506365 (Scopus ID)094405c9-34fe-4755-b382-0f52e2f83981 (Local ID)094405c9-34fe-4755-b382-0f52e2f83981 (Archive number)094405c9-34fe-4755-b382-0f52e2f83981 (OAI)
Note
Validerad; 2014; 20131204 (dankor)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Korelskiy, D., Ye, P., Zhou, H., Mouzon, J. & Hedlund, J. (2014). Correction: An experimental study of micropore defects in MFI membranes (ed.). Paper presented at . Microporous and Mesoporous Materials, 197, 358
Open this publication in new window or tab >>Correction: An experimental study of micropore defects in MFI membranes
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2014 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 197, p. 358-Article in journal (Refereed) Published
Abstract [en]

In the present work, two ultra-thin MFI membranes, prepared using hydroxide and fluoride ions as mineralizing agents, respectively, were carefully examined by permporometry. The amount of micropore defects, as determined by permporometry, differed significantly between the two different membranes. For the first time, it was demonstrated that the micropore defects determined by permporometry were most likely open grain boundaries. The results were verified by direct observation of the open grain boundaries by a state-of-the-art XHR-scanning electron microscopy instrument. In addition, the permporometry data were also consistent with permeation data using 1,3,5-trimethylbenzene (TMB) as a probe molecule, separation data using an equimolar mixture of n-hexane and TMB, and nitrogen adsorption data

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-6755 (URN)10.1016/j.micromeso.2014.05.026 (DOI)000340990200045 ()2-s2.0-84955670674 (Scopus ID)50a5bcad-ad0a-4b90-bc67-9383864e98a2 (Local ID)50a5bcad-ad0a-4b90-bc67-9383864e98a2 (Archive number)50a5bcad-ad0a-4b90-bc67-9383864e98a2 (OAI)
Note
Godkänd; 2014; 20140925 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Korelskiy, D., Ye, P., Zhou, H., Mouzon, J. & Hedlund, J. (2014). Reprint of: An experimental study of micropore defects in MFI membranes (ed.). Paper presented at . Microporous and Mesoporous Materials, 192, 69-75
Open this publication in new window or tab >>Reprint of: An experimental study of micropore defects in MFI membranes
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2014 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 192, p. 69-75Article in journal (Refereed) Published
Abstract [en]

In the present work, two ultra-thin MFI membranes, prepared using hydroxide and fluoride ions as mineralizing agents, respectively, were carefully examined by permporometry. The amount of micropore defects, as determined by permporometry, differed significantly between the two different membranes. For the first time, it was demonstrated that the micropore defects determined by permporometry were most likely open grain boundaries. The results were verified by direct observation of the open grain boundaries by a state-of-the-art XHR-scanning electron microscopy instrument. In addition, the permporometry data were also consistent with permeation data using 1,3,5-trimethylbenzene (TMB) as a probe molecule, separation data using an equimolar mixture of n-hexane and TMB, and nitrogen adsorption data

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-14517 (URN)10.1016/j.micromeso.2014.03.039 (DOI)000336713100012 ()2-s2.0-84900475071 (Scopus ID)de2c83e7-6ab0-4cb1-97e5-d741b9e8272b (Local ID)de2c83e7-6ab0-4cb1-97e5-d741b9e8272b (Archive number)de2c83e7-6ab0-4cb1-97e5-d741b9e8272b (OAI)
Note
Godkänd; 2014; 20140527 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Zhou, M., Grahn, M., Zhou, H., Holmgren, A. & Hedlund, J. (2014). The facile assembly of nanocrystals by optimizing humidity (ed.). Paper presented at . Chemical Communications, 50(91), 14261-14264
Open this publication in new window or tab >>The facile assembly of nanocrystals by optimizing humidity
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2014 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 50, no 91, p. 14261-14264Article in journal (Refereed) Published
Abstract [en]

The ambient humidity and the nature of substrates are considered coordinately in the assembly of nano-sized crystals. The nanocrystal monolayers show large-area uniformity without any aggregates. Zeolite and hematite monolayers with thicknesses of 20–100 nm and excellent orientations are produced.

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-4660 (URN)10.1039/C4CC06603K (DOI)000344226000048 ()25286288 (PubMedID)2-s2.0-84908354112 (Scopus ID)2a37a65b-d90a-4c25-af0a-b2b50eca7ed4 (Local ID)2a37a65b-d90a-4c25-af0a-b2b50eca7ed4 (Archive number)2a37a65b-d90a-4c25-af0a-b2b50eca7ed4 (OAI)
Note
Validerad; 2014; 20140929 (magr)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Zhou, H., Korelskiy, D., Sjöberg, E. & Hedlund, J. (2014). Ultrathin Hydrophobic MFI Membranes (ed.). Paper presented at . Microporous and Mesoporous Materials, 192, 76-81
Open this publication in new window or tab >>Ultrathin Hydrophobic MFI Membranes
2014 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 192, p. 76-81Article in journal (Refereed) Published
Abstract [en]

Hydrophobic MFI membranes with a film thickness of less than 500 nm and a very low amount of defects were grown on α-alumina supports in fluoride media at near neutral pH (denoted TPAF-MFI membrane). These membranes are at least 4 times thinner than previous membranes prepared in fluoride media at near neutral pH; moreover, corresponding separation performance is the first time reported in this paper. For comparison, MFI membranes with a film thickness of about 500 nm were grown in hydroxide media at high pH (denoted TPAOH-MFI membrane). According to the permporometry results, the amount of defects in the TPAF-MFI membranes is about half of that in the TPAOH-MFI membranes, and most of the defects in both membranes are smaller than 1 nm. The membranes were evaluated for separation of a feed of 5 kPa n-butanol and 5kPa water, with 91 kPa helium as balance gas and 101 kPa helium as sweep gas. Both membranes displayed high permeance and the TPAF-MFI membrane was more selective to n-butanol than the TPAOH-MFI membrane. Interestingly, the total permeance and n-butanol/water separation factor increased to 11×10-7 mol/(m2 s Pa) and 19, respectively, after activation of the TPAF-MFI membrane at 300 ˚C in a helium flow saturated with n-butanol at 25 ˚C. The TPAF-MFI membrane also displayed a CO2/H2 separation factor of 6 at 25˚C and a CO2 permeance of 26×10-7 mol/(m2 s Pa) for a feed of 450 kPa CO2 and 450 kPa H2 and 101 kPa helium sweep gas.

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-5251 (URN)10.1016/j.micromeso.2013.09.017 (DOI)000336713100013 ()2-s2.0-84900488534 (Scopus ID)34ea329a-6ebd-4c0b-93b8-fc81947234ac (Local ID)34ea329a-6ebd-4c0b-93b8-fc81947234ac (Archive number)34ea329a-6ebd-4c0b-93b8-fc81947234ac (OAI)
Note
Validerad; 2014; Bibliografisk uppgift: Special issue devoted to the 6th International Zeolite Membrane Meeting; 20130911 (dankor)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Korelskiy, D., Zhou, H., Mouzon, J. & Hedlund, J. (2013). An experimental study of micropore defects in MFI membranes (ed.). Paper presented at International Zeolite Membrane Meeting : 15/06/2013 - 19/06/2013. Paper presented at International Zeolite Membrane Meeting : 15/06/2013 - 19/06/2013.
Open this publication in new window or tab >>An experimental study of micropore defects in MFI membranes
2013 (English)Conference paper, Oral presentation only (Refereed)
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-38816 (URN)d544a649-58ed-4410-9f04-ada6853a67f5 (Local ID)d544a649-58ed-4410-9f04-ada6853a67f5 (Archive number)d544a649-58ed-4410-9f04-ada6853a67f5 (OAI)
Conference
International Zeolite Membrane Meeting : 15/06/2013 - 19/06/2013
Note
Godkänd; 2013; 20131129 (dankor)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Korelskiy, D., Leppäjärvi, T., Zhou, H., Grahn, M., Tanskanen, J. & Hedlund, J. (2013). High flux MFI membranes for pervaporation (ed.). Paper presented at . Journal of Membrane Science, 427, 381-389
Open this publication in new window or tab >>High flux MFI membranes for pervaporation
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2013 (English)In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 427, p. 381-389Article in journal (Refereed) Published
Abstract [en]

MFI membranes with a thickness of 0.5 μm prepared on a graded α-alumina support were evaluated for separation of feed mixtures of 3 wt.% n-butanol/water and 10 wt.% ethanol/water by pervaporation. The membranes were selective to n-butanol and ethanol. The flux observed in the present work was about 100 times higher than that previously reported for n-butanol/water separation by pervaporation and about 5 times higher than that for ethanol/water separation by pervaporation. At 60 °C, the observed n-butanol/water flux was about 4 kg m−2 h−1 and the n-butanol/water separation factor was about 10 for the best membrane. At the same temperature, the membrane displayed an ethanol/water flux of ca. 9 kg m−2 h−1 and an ethanol/water separation factor of ca. 5. A mathematical model indicated significant mass transfer resistance in the support, which reduced the flux and the selectivity of the membranes.

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-16000 (URN)10.1016/j.memsci.2012.10.016 (DOI)000311842400040 ()2-s2.0-84871031330 (Scopus ID)f95f5060-5a57-442d-a102-9e656dfc46cd (Local ID)f95f5060-5a57-442d-a102-9e656dfc46cd (Archive number)f95f5060-5a57-442d-a102-9e656dfc46cd (OAI)
Note
Validerad; 2013; 20121024 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Zhou, H., Korelskiy, D., Sjöberg, E. & Hedlund, J. (2013). Ultra-thin hydrophobic MFI membranes (ed.). Paper presented at International Zeolite Membrane Meeting : 15/06/2013 - 19/06/2013. Paper presented at International Zeolite Membrane Meeting : 15/06/2013 - 19/06/2013.
Open this publication in new window or tab >>Ultra-thin hydrophobic MFI membranes
2013 (English)Conference paper, Oral presentation only (Refereed)
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-30150 (URN)3e38b8de-7343-4e75-bbb6-7410ac24ffdb (Local ID)3e38b8de-7343-4e75-bbb6-7410ac24ffdb (Archive number)3e38b8de-7343-4e75-bbb6-7410ac24ffdb (OAI)
Conference
International Zeolite Membrane Meeting : 15/06/2013 - 19/06/2013
Note
Godkänd; 2013; 20131214 (hanzho)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Filippov, A., Dvinskikh, S. V. ., Khakimov, A., Grahn, M., Zhou, H., Furo, I., . . . Hedlund, J. (2012). Dynamic properties of water in silicalite-1 powder (ed.). Paper presented at . Magnetic Resonance Imaging, 30(7), 1022-1031
Open this publication in new window or tab >>Dynamic properties of water in silicalite-1 powder
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2012 (English)In: Magnetic Resonance Imaging, ISSN 0730-725X, E-ISSN 1873-5894, Vol. 30, no 7, p. 1022-1031Article in journal (Refereed) Published
Abstract [en]

Self-diffusion of D 2O in partially filled silicalite-1 crystals was studied at 25°C by 2H nuclear magnetic resonance (NMR) with bipolar field gradient pulses and longitudinal Eddy-current-delay. For the first time, reliable experimental diffusion data for this system were obtained. Analysis of NMR diffusion decays revealed the presence of a continuous distribution of apparent self-diffusion coefficients (SDCs) of water, ranging from 10 -7 to ~10 -10 m 2/s, which include values much higher and lower than that of bulk water (~10 -9 m 2/s) in liquid phase. The observed distribution of SDC changes with variation of the diffusion time in the range of 10-200 ms. A two-site Kärger exchange model was successfully fitted to the data. Finally, the water distribution and exchange in silicalite-1 pores were described by taking into account (a) a gas-like phase in the zeolite pores, a gas-like phase in mesopores and an intercrystalline gas-like phase and (b) intercrystalline liquid droplets with intermediate exchange rate with the other phases. The other phases experience fast exchange on the NMR diffusion time scale. Diffusion coefficients and mean residence times of water in some of these states were estimated

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-8323 (URN)10.1016/j.mri.2012.02.026 (DOI)000306873300014 ()22495241 (PubMedID)2-s2.0-84863998026 (Scopus ID)6d3ecd71-7621-44b7-8f2a-3971847afd63 (Local ID)6d3ecd71-7621-44b7-8f2a-3971847afd63 (Archive number)6d3ecd71-7621-44b7-8f2a-3971847afd63 (OAI)
Note
Validerad; 2012; 20120806 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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