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Featured researches published by Hoang Vinh-Thang.


RSC Advances | 2015

Membrane gas separation technologies for biogas upgrading

Xiao Yuan Chen; Hoang Vinh-Thang; Antonio Avalos Ramirez; Denis Rodrigue

Biogas is a renewable energy source like solar and wind energies and mostly produced from anaerobic digestion (AD). The production of biogas is a well-established technology, but its commercial utilization is limited because on-site purification is needed before its transport or use. Biogas composition varies with the biomass digested and contains mainly methane (CH4) and carbon dioxide (CO2), as well as traces of hydrogen sulfide (H2S), ammonia (NH3), hydrogen (H2), nitrogen (N2), carbon monoxide (CO), oxygen (O2). In some cases dust particles and siloxanes are present. Several purification processes including pressurized water scrubbing, amine swing absorption, pressure swing adsorption, temperature swing adsorption, cryogenic separation and membrane technologies have been developed. Nevertheless, membrane technology is a relatively recent but very promising technology. Also, hybrid processes where membranes are combined with other processes are believed to have lower investment and operation costs compared with other processes. In this report, a discussion on the different materials used to produce membranes for gas separation is given including inorganic, organic and mixed matrix membranes, as well as polymer of intrinsic microporosity (PIM). Advantages and limitations for each type are discussed and comparisons are made in terms of permeability and diffusivity for a range of operating conditions.


Journal of Materials Chemistry | 2015

Polymer functionalization to enhance interface quality of mixed matrix membranes for high CO2/CH4 gas separation

Nguyen Tien-Binh; Hoang Vinh-Thang; Xiao Yuan Chen; Denis Rodrigue

Hydroxyl-functionalized homo- and co-polyimides 6FDA–(DAM)x–(HAB)y (with x : y molar ratio of 1 : 0; 2 : 1; 1 : 1; 1 : 2) and two metal–organic frameworks (MOFs), MIL-53(Al) and NH2-MIL-53(Al) were synthesized for preparation of mixed matrix membranes (MMMs). The MOF loadings were varied over the range of 10–20 wt% for NH2-MIL-53(Al) and 10–15 wt% for MIL-53(Al). The incorporation of hydroxyl groups into the polyimide backbone is expected to improve the interfacial interaction between the polymer matrix and fillers, consequently, enhancing gas separation performance of MMMs. A big increase in glass transition temperature (Tg) for MMMs confirmed the polymer chain rigidification, which was caused by a strong interaction between the hydroxyl groups in the copolyimides and the amine groups in NH2-MIL-53(Al). Additionally, SEM results showed that the hydroxyl groups facilitated the particle dispersion in the MMMs, either was NH2-MIL-53(Al) or MIL-53 used as filler. Gas separation performances of MMMs were characterized by both CO2/CH4 pure gas and binary permeation measurements at 35 °C and 150 psi. The incorporation of NH2-MIL-53(Al) in the hydroxyl-copolyimides was found to significantly improve the CO2/CH4 separation factor while maintaining CO2 permeability of the MMMs as high as those of the neat corresponding copolyimides, therefore greatly enhancing the MMM separation performance. For example, the MMM prepared from 6FDA–DAM–HAB (1 : 1) copolyimide and 10 wt% NH2-MIL-53(Al) showed a permeability/selectivity behavior approaching the 2008 Robesons upper bound making it attractive for practical usage. The significant improvement in CO2/CH4 separation factor observed for the MMMs made of the hydroxyl-copolyimides and the amine-functionalized MOFs was due to (i) the enhanced polymer–filler compatibility originating from a mutual interaction between the polymer-functional moieties and the amine-functionalized MOF surface yielding defect-free MMMs and (ii) the high CO2/CH4 selective adsorption in the NH2-MIL-53(Al) framework.


RSC Advances | 2014

Effect of macrovoids in nano-silica/polyimide mixed matrix membranes for high flux CO2/CH4 gas separation

Xiao Yuan Chen; Hoang Vinh-Thang; Denis Rodrigue

Macrovoid structured mixed matrix membranes (MMMs) composed of nano-size (200 nm) silica particles and co-polyimide were prepared from 6FDA–ODA–DAM (6FDA = 4,4′-(hexafluoroiso-propylidene)diphthalic anhydride; ODA = 4,4′-oxidianiline; DAM = 1,3,5-trimethyl-2,6-phenylenediamine) with different proportions (1 : 1 and 1 : 4) and tetraethoxysilane (TEOS) via the sol–gel method. The separation performance of MMMs with 6FDA–ODA–DAM treated at high temperature (450 °C) was excellent for CO2/CH4 separation (for 6FOD–ODA–DAM (1 : 1): CO2 permeability ∼265 Barrer and CO2/CH4 selectivity ∼32; for 6FOD–ODA–DAM (1 : 4): CO2 permeability ∼302 Barrer and CO2/CH4 selectivity ∼25). Remarkably, the best membrane could resist pressure up to 600 psi without any loss of permselectivity. The CO2/CH4 separation performance of a series of silica–6FDA–ODA–DAM(11) MMMs with different SiO2 loadings is theoretically predicted using a modified Maxwell model where both gas permeability and macrovoid shape factor are simultaneously considered as adjustable parameters. Applying the optimized values, the modified Maxwell model predictions were in excellent agreement with experimental permeability data (less than 2% deviation).


Chemical Reviews | 2013

Predictive Models for Mixed-Matrix Membrane Performance: A Review

Hoang Vinh-Thang


Industrial & Engineering Chemistry Research | 2012

Amine-Functionalized MIL-53 Metal–Organic Framework in Polyimide Mixed Matrix Membranes for CO2/CH4 Separation

Xiao Yuan Chen; Hoang Vinh-Thang; Denis Rodrigue


Microporous and Mesoporous Materials | 2006

Adsorption of n-heptane, toluene and o-xylene on mesoporous UL-ZSM5 materials

Qinglin Huang; Hoang Vinh-Thang; Amir Malekian; Mladen Eić; Do Trong-On


Langmuir | 2005

Adsorption of C7 hydrocarbons on biporous SBA-15 mesoporous silica

Hoang Vinh-Thang; Qinglin Huang; Mladen Eić; Do Trong-On


Journal of Power Sources | 2013

Electrocatalyst synthesized from metal organic frameworks

Foroughazam Afsahi; Hoang Vinh-Thang; Serguei D. Mikhailenko


Langmuir | 2006

Structural and diffusion characterizations of steam-stable mesostructured zeolitic UL-ZSM-5 materials

Hoang Vinh-Thang; Qinglin Huang; Adrian Ungureanu; Mladen Eić; Do Trong-On


Journal of Membrane Science | 2016

Crosslinked MOF-polymer to enhance gas separation of mixed matrix membranes

Nguyen Tien-Binh; Hoang Vinh-Thang; Xiao Yuan Chen; Denis Rodrigue

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Qinglin Huang

University of New Brunswick

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Mladen Eić

University of New Brunswick

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Amir Malekian

University of New Brunswick

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