Advances in Hydrogen Separation and Purification with Membrane Technology

Zornoza, Beatriz; Casado, Clara; Navajas, Alberto

doi:10.1016/b978-0-444-56352-1.00011-8

Cited by 40 publications

(47 citation statements)

References 154 publications

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“…Mixed matrix membranes (MMMs) have been considered as an effective approach to enhance the gas transport properties . The influence of particles with a variety of size, type (inorganic and organic), shapes (cubic, spherical, sheet‐like, etc), and pore diameters has been extensively studied . Also, the interaction of particles with polymer chains greatly effects on the gas separation performance.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane‐mesoporous silica gas separation membranes

Ghalei

Isfahani

Sadeghi

et al. 2017

Polymers for Advanced Techs

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The concept of mixed matrix membrane comprising dispersed inorganic fillers into a polymer media has revealed appealing to tune the gas separation performance. In this work, the membranes were prepared by incorporation of mesoporous silica into polyurethane (PU). Mesoporous silica particles with different pore size and structures, MCM-41, cubic MCM-48 and SBA-16, were synthesized by templating method and functionalized with 3-aminopropyltriethoxysilane (APTES). High porosity and aminated surface of the mesoporous silica enhance the adhesion of the particles to the PU matrix. The SEM and FTIR results showed strong interactions between the particles and the PU chains. Moreover, the thermal stability of the hybrid PUs improved compared to the pure polymer. Gas transport properties of the membranes were measured for pure CO 2 , CH 4 , O 2 , and N 2 gases at 10 bar and 25°C. The results showed that the gas permeabilities enhanced with increasing in the loading of modified mesoporous silica particles. High porosity and amine-functionalized particles render opportunities to enhance the gas diffusivity and solubility through the membranes. The enhanced gas transport properties of the mixed matrix membranes reveal the advantages of mesoporous silica to improve the gas permeability (CO 2 permeability up to~70) without scarifying the gas selectivity (α(CO 2 /N 2 )~30 for 5 wt% SBA-16 content).

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Section: Introductionmentioning

confidence: 99%

Polyurethane‐mesoporous silica gas separation membranes

Ghalei

Isfahani

Sadeghi

et al. 2017

Polymers for Advanced Techs

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“…In the most favorable conditions (1% w/w Pt over La-Ce 2 honeycomb, 600 • C and GHSV = 16,000 h −1 ), they achieved a reduction near to 90%-96% of total organic carbon present in the OMW with a generation of 40 mL of hydrogen per mL of feedstock. Most final applications of hydrogen generated in these thermal processes require a very high level of purity that needs to be achieved by a subsequent purification step [32]. In this context, an interesting proposal is based on the combination of both reaction and separation steps in a unique device, denoted as membrane reactor, in which ultra-pure H 2 produced by the reaction can be directly separated through the membrane [33].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Pure Hydrogen via Co-Valorization of Olive Mill Wastewater and Bioethanol in Pd-Membrane Reactors

et al. 2020

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Olive mill wastewater (OMW) presents high environmental impact due to the fact of its elevated organic load and toxicity, especially in Mediterranean countries. Its valorization for simultaneous pollutants degradation and green energy production is receiving great attention, mainly via steam reforming for hydrogen generation. Following previous works, the present research goes into detail about OMW valorization, particularly investigating for the first time the potential benefits of OMW–bioethanol mixtures co-reforming for ultra-pure hydrogen production in Pd-membrane reactors. In this manner, the typical large dilution of OMW and, hence, excess water can be used as a reactant for obtaining additional hydrogen from ethanol. Fresh OMW was previously conditioned by filtration and distillation processes, analyzing later the effect of pressure (1–5 bar), oxidizing conditions (N2 or air as carrier gas), gas hourly space velocity (150–1500 h−1), and alcohol concentration on the co-reforming process (5–10% v/v). In all cases, the exploitation of OMW as a source of environmentally friendly hydrogen was demonstrated, obtaining up to 30 NmL·min−1 of pure H2 at the most favorable experimental conditions. In the membrane reactor, higher pressures up to 5 bar promoted both total H2 production and pure H2 recovery due to the increase in the permeate flux despite the negative effect on reforming thermodynamics. The increase of ethanol concentration also provoked a positive effect, although not in a proportional relation. Thus, a greater effect was obtained for the increase from 5% to 7.5% v/v in comparison to the additional improvement up to 10% v/v. On the contrary, the use of oxidative conditions slightly decreased the hydrogen production rate, while the effect of gas hourly space velocity needs to be carefully analyzed due to the contrary effect on potential total H2 generation and pure H2 recovery.

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“…Gas separation performance is a direct indicator of the presence or absence of microdefects, 63 and the good dispersion of MOFs in MMMs. There was an obvious difference between the gas separation performances of the MMMs with non-dried and dried MOFs, as given in Fig.…”

Section: Gas Separation Performancementioning

confidence: 99%

Mixed matrix membranes prepared from non-dried MOFs for CO₂/CH₄ separations

2016

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Mixed matrix membranes (MMMs) aim at combining the processibility of polymers with the molecular sieving of fillers to improve gas separation performance. Metal-organic frameworks (MOFs) are a new family of materials with promising potential as fillers. The first part of this work reports on exploiting the versatility of MOF synthesis routes by forming ZIF-8 particles in polymer solutions to subsequently cast membranes directly from the solution. Although MOFs can be synthesised in a polymer medium, the decline in the synthesis yield does not allow for high loading in the MMMs. The second part describes a method for preparing MMMs with the commercial polyimide (PI) Matrimid® and ZIF-8, ZIF-7 and NH 2 -MIL-53(Al) as non-dried filler with 30 wt% and 50 wt% loading. A comparison of this method with the conventional approach of drying MOFs prior to incorporation exhibits the flexibility MOFs provide in membrane synthesis, in contrast to e.g. zeolites which intrinsically have to be calcined to become useful. The membranes with non-dried MOFs show some improvement in performance as compared to the unfilled polymer-only membranes, while those with dried MOFs even lose the inherent selectivity of the polymer.

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Advances in Hydrogen Separation and Purification with Membrane Technology

Cited by 40 publications

References 154 publications

Polyurethane‐mesoporous silica gas separation membranes

Polyurethane‐mesoporous silica gas separation membranes

Ultra-Pure Hydrogen via Co-Valorization of Olive Mill Wastewater and Bioethanol in Pd-Membrane Reactors

Mixed matrix membranes prepared from non-dried MOFs for CO₂/CH₄ separations

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Advances in Hydrogen Separation and Purification with Membrane Technology

Cited by 40 publications

References 154 publications

Polyurethane‐mesoporous silica gas separation membranes

Polyurethane‐mesoporous silica gas separation membranes

Ultra-Pure Hydrogen via Co-Valorization of Olive Mill Wastewater and Bioethanol in Pd-Membrane Reactors

Mixed matrix membranes prepared from non-dried MOFs for CO2/CH4 separations

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Mixed matrix membranes prepared from non-dried MOFs for CO₂/CH₄ separations