On some new clathrates of hydroquinone

Peyronel, Giorgio; Barbieri, Giorgio

doi:10.1016/0022-1902(58)80233-x

Cited by 7 publications

(10 citation statements)

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“…from 6.0 to 9.0 MPa) has no significant impact on q. It is possible that the increase in transient capacity related to the enhancement of gas capture kinetics with pressure is affected by a reduction in clathrate occupancy at high pressure as observed in literature [37]. Now, re garding the effect of temperature, we perceive that the high tempera ture slightly enhances the kinetics in agreement with literature data [30].…”

Section: Evaluation Of Native Hqsupporting

confidence: 91%

Hydroquinone clathrate based gas separation (HCBGS): Application to the CO2/CH4 gas mixture

Coupan

Dicharry

Torré

2018

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Hydroquinone (HQ) clathrates have recently been identified as promising candidates for selective gas capture and storage processes. This study evaluates the effectiveness of HQ clathrates in the separation of CO 2 from CO 2 / CH 4 gas mixtures, through direct gas/solid reactions in a fixed-bed reactor. The influence of the process operating parameters (i.e. reaction time, pressure, temperature and feed gas composition) on the CO 2 capture kinetics, selectivity towards CO 2 , and transient storage capacity were investigated. The experiments were performed using either pure HQ or HQ-based composite materials, with temperatures ranging from about 283 to 343 K, pressures from 3.0 to 9.0 MPa, and CO 2 mole fraction in the gas mixture ranging from 0.2 to 1. The experimental results show that over the range of gas composition investigated, the enclathration reaction is selective to CO 2. This preferential CO 2 capture is enhanced at high CO 2 mole fractions, low temperatures and high pressures. Regarding gas capture kinetics, it was confirmed that the composite material is much more efficient than pure HQ crystals. The CO 2 enclathration rate increases with temperature, pressure and CO 2 fraction in the feed gas. For the first time, the feasibility of such gas separation techniques using HQ clathrates was demonstrated at bench scale.

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Section: Evaluation Of Native Hqsupporting

confidence: 91%

Hydroquinone clathrate based gas separation (HCBGS): Application to the CO2/CH4 gas mixture

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Dicharry

Torré

2018

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“…Note that other authors have found lower clathrate occupancy values in different experimental conditions: 0.74 was obtained for 30 h of gas–solid reaction at 293–353 K and at a CO 2 pressure of 4.0 MPa and 0.76 after 45 days of reaction at 323 K and 3.0 MPa . Furthermore, our occupancy result is also higher than what is generally found for CO 2 -HQ clathrates formed by crystallization from a solvent. − This point is not surprising as the method for synthesizing gas–solid clathrates is different from the one used for “liquid-phase” synthesis. Consequently, we can assume that it is possible to reach occupancies very close to unity (such as those found in our study with x = 0.94 ± 0.05) when the gas–solid reaction is performed in suitable operating conditions.…”

Section: Resultsmentioning

confidence: 39%

“…Its chemical formula is 3C 6 H 4 (OH) 2 · x G, where G is the guest molecule in the clathrate structure and x is the clathrate occupancy (i.e., the proportion of cavities filled by guest molecules, ranging from 0 for guest-free clathrates to 1 for full clathrates). ,− This stoichiometric relationship has been used to determine that the maximum storage capacity of HQ clathrates is 3.03 mol Guest /kg HQ . The highest clathrate occupancy observed so far is approximately 0.74 for the CO 2 -HQ clathrates formed by crystallization from a solvent. − For CH 4 -HQ, full occupancy has already been achieved (i.e., the clathrate occupancy is equal to 1) …”

Section: Introductionmentioning

confidence: 97%

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Characterization Study of CO₂, CH₄, and CO₂/CH₄ Hydroquinone Clathrates Formed by Gas–Solid Reaction

et al. 2017

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Hydroquinone (HQ) is known to form organic clathrates with some gaseous species such as CO2 and CH4. This work presents spectroscopic data, surface and internal morphologies, gas storage capacities, guest release temperatures, and structural transition temperatures for HQ clathrates obtained from pure CO2, pure CH4, and an equimolar CO2/CH4 mixture. All analyses are performed on clathrates formed by direct gas–solid reaction after 1 month’s reaction at ambient temperature conditions and under a pressure of 3.0 MPa. A collection of spectroscopic data (Raman, FT-IR, and 13C NMR) is presented, and the results confirm total conversion of the native HQ (α-HQ) into HQ clathrates (β-HQ) at the end of the reaction. Optical microscopy and SEM analyses reveal morphology changes after the enclathration reaction, such as the presence of surface asperities. Gas porosimetry measurements show that HQ clathrates and native HQ are neither micro- nor mesoporous materials. However, as highlighted by TEM analyses and X-ray tomography, α- and β-HQ contain unsuspected macroscopic voids and channels, which create a macroporosity inside the crystals that decreases due to the enclathration reaction. TGA and in situ Raman spectroscopy give the guest release temperatures as well as the structural transition temperatures from β-HQ to α-HQ. The gas storage capacity of the clathrates is also quantified by means of different types of gravimetric analyses (mass balance and TGA). After having been formed under pressure, the characterized clathrates exhibit exceptional metastability: the gases remain in the clathrate structure at ambient conditions over time scales of more than 1 month. Consequently, HQ gas clathrates display very interesting properties for gas storage and sequestration applications.

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“…These experimental conditions were chosen for two main reasons: (i) CO 2 HQ clathrates can form under relatively high temperature (e.g. 323 K) and pressure [20] condi tions, which could be economically very advantageous when the raw gas is already hot and pressurized, the case for example of a production gas containing CO 2 /CH 4 ; (ii) CO 2 HQ clathrates may reach their maximum capacity when the formation pressure is close to 3.0 MPa [30], justifying the operating pressure chosen for these tests.…”

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confidence: 99%

Creating innovative composite materials to enhance the kinetics of CO 2 capture by hydroquinone clathrates

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Plantier

Torré

et al. 2017

Chemical Engineering Journal

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On some new clathrates of hydroquinone

Cited by 7 publications

References 4 publications

Hydroquinone clathrate based gas separation (HCBGS): Application to the CO2/CH4 gas mixture

Hydroquinone clathrate based gas separation (HCBGS): Application to the CO2/CH4 gas mixture

Characterization Study of CO₂, CH₄, and CO₂/CH₄ Hydroquinone Clathrates Formed by Gas–Solid Reaction

Creating innovative composite materials to enhance the kinetics of CO 2 capture by hydroquinone clathrates

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On some new clathrates of hydroquinone

Cited by 7 publications

References 4 publications

Hydroquinone clathrate based gas separation (HCBGS): Application to the CO2/CH4 gas mixture

Hydroquinone clathrate based gas separation (HCBGS): Application to the CO2/CH4 gas mixture

Characterization Study of CO2, CH4, and CO2/CH4 Hydroquinone Clathrates Formed by Gas–Solid Reaction

Creating innovative composite materials to enhance the kinetics of CO 2 capture by hydroquinone clathrates

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Characterization Study of CO₂, CH₄, and CO₂/CH₄ Hydroquinone Clathrates Formed by Gas–Solid Reaction