Higher Gas Solubility in Nanoliquids?

Miachon, S.; Syakaev, Victor V.; Rakhmatullin, Aydar; Pera‐Titus, Marc; Caldarelli, Stéfano; Dalmon, J.A.

doi:10.1002/cphc.200700638

Cited by 57 publications

(72 citation statements)

References 30 publications

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“…The experimental trends of H 2 solubility in ethanol with the nanoliquid size depicted in Figure 5 and summarized in Table 2 are qualitatively consistent with those found by 1 H-RMN in our previous study 19 for CH 4 and C 2 H 6 in CCl 4 and CS 2 . H 2 solubility is increased up to four to five times for nanoliquid sizes lower than 5 nm while bulk solubility tends to be recovered beyond 15 nm.…”

Section: Increased Gas Solubility In Nanoliquidssupporting

confidence: 89%

“…Taking into account this experimental observation, gas solubility can be related to the nanoliquid size, d, through a mass-balance based model as proposed previously. 19 Regarding a gas-liquid interface confined in a slit-like mesopore as illustrated in Figure 7 (for simplicity, the meniscus has been omitted and the pore depth has been equaled to the pore size), the overall H 2 solubility, ' H2 , can be obtained from a mass balance as follows…”

Section: Resultsmentioning

confidence: 99%

“…Unit 1 included a stainless steel cell of perfectly known volume, a calibrated reference volume, a differential pressure gauge (Rosemont 3051, Emerson Process Management, USA, accuracy \0.06% full scale, 0-630 mbar), and two total pressure gauges (Keller AG, Jestetten, Germany, 0-20 bar and 0-400 mbar, respectively) to carry out the microvolumetry measurements. Compared to the methodology used in a previous work relying on 1 H-NMR analysis, 19 microvolumetry is not limited to proton-free solvents, and the measurements are faster and easier to perform.…”

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confidence: 96%

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Increased gas solubility in nanoliquids: Improved performance in interfacial catalytic membrane contactors

Pera‐Titus¹,

Miachon²,

Dalmon³

2008

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).The kinetics of gas-liquid catalytic reactions can be strongly promoted when these are performed in interfacial catalytic membrane reactors instead of other three-phase reactors such as slurry stirrers or trickle beds. The well-defined gas-liquid-catalyst contact in this system avoiding diffusional limitations is usually argued as the main reason for such enhancement. In this work, using nitrobenzene hydrogenation as a model reaction, we propose that this increased catalytic performance might also be attributed, at least partially, to increased gas solubilities in mesoconfined solvents (or simply ''nanoliquids'') in interfacial contactors overcoming the values predicted by Henry's Law. To support this hypothesis, we provide experimental evidence of a dramatic increase of H 2 solubility in confined ethanol using mesoporous c-Al 2 O 3 as confining solid. Gas-liquid solubilities can be enhanced up to five times over the corresponding bulk values for nanoliquid sizes lower than 15 nm as long as the gas-liquid interface is confined in a mesoporous array. In such a situation, the volume of the gasliquid interface is no longer negligible compared to the total volume of the confined liquid, and the high surface excess concentrations of the gas adsorbed on the liquid surface make solubility grow up dramatically. According to these measurements, we discuss how nanoliquids might form in catalytic membrane contactors, which gas-liquid configuration in the reactor appears to be more appropriate, and how the structure of the mesoporous catalytic layer contributes to their increased gas solubilization performance.

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Section: Increased Gas Solubility In Nanoliquidssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 96%

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Increased gas solubility in nanoliquids: Improved performance in interfacial catalytic membrane contactors

Pera‐Titus¹,

Miachon²,

Dalmon³

2008

AIChE Journal

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“…It is now well known that such conditions change the chemical reactivity of gas-water-rock systems. In particular, the increase of gas uptake in unsaturated porous media, compared to bulk water, has been observed experimentally (Miachon et al, 2008), studied theoretically (Berkeley and Carey, 2013;Letellier and Turmine, 2013) and/or interpreted from field observations (Henry et al, 1999;Mercury et al, 2004). In addition, recent experiments have shown that capillary constraints also modify the reactivity of simple brine-crystalline salt systems (Bouzid et al, 2011a, b).…”

Section: Desaturation Issuesmentioning

confidence: 95%

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Lassin

Marty

Gailhanou

et al. 2016

Geochimica et Cosmochimica Acta

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, et al.. Equilibrium partial pressure of CO 2 in Callovian-Oxfordian argillite as a func-tion of relative humidity: experiments and modelling. Geochimica et Cosmochimica Acta, Elsevier, 2016Elsevier, , 186, pp.91-104. 10.1016Elsevier, /j.gca.2016 Accepted Manuscript This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractHaving previously demonstrated that the mineral assemblage of claystone can impose its pCO 2 under saturated conditions, we here study the effect of rock desaturation, i.e.the evaporation of pore water, on the partial pressure of CO 2 (pCO 2 ) in CallovianOxfordian argillite from the Paris Basin (France). In this new study, which combines experiments at room temperature and geochemical modelling, we examine the primary role of capillary forces on chemical equilibria for relative humidity values ranging between 50% and 100%. In particular we are able, without any fitting parameters, to model the experimental decrease of pCO 2 as a function of decreasing water content in the argillite. This application to a complex natural system not only confirms the theoretical concepts of geochemistry in capillary contexts, but is promising with respect to other systems, both natural (soil, rock) and industrial (ceramics, granular material).

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“…[1] For example, gas trapped in nanometer-size pores order into crystalline arrays [2] or condenses in the pores at lower pressure that the saturation pressure of the bulk liquid. [3] The so-called finite-size effects are attributed to the competition between fluid-wall and fluid-fluid forces, leading to liquid reorganization and to a change in order level. [4] Although gas solubility in liquids has been reported in the literature for more than a century, studies focusing on gas absorption in liquids at the nanoscale level remain very scarce.…”

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confidence: 99%

Carbon Dioxide Oversolubility in Nanoconfined Liquids for the Synthesis of Cyclic Carbonates

2017

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Higher Gas Solubility in Nanoliquids?

Cited by 57 publications

References 30 publications

Increased gas solubility in nanoliquids: Improved performance in interfacial catalytic membrane contactors

Increased gas solubility in nanoliquids: Improved performance in interfacial catalytic membrane contactors

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Carbon Dioxide Oversolubility in Nanoconfined Liquids for the Synthesis of Cyclic Carbonates

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