Gas adsorption microcalorimetry and modelling to characterise zeolites and related materials

Llewellyn, Philip L.; Maurin, Guillaume

doi:10.1016/j.crci.2004.11.004

Cited by 136 publications

(121 citation statements)

References 47 publications

(49 reference statements)

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“…We note that the experimental and predicted enthalpies for CH 4 ) currently obtained for many other MOFs. 4,12,19,20,23,32 This can be related to the high degree of confinement created by the MIL-91(Al) pores whose dimensions are very close to the kinetic diameter of methane.…”

Section: Resultsmentioning

confidence: 99%

“…The buoyancy effect on the adsorbent and the adsorbent phases is taken into account to obtain excess and absolute isotherms, respectively. 19,32 It should be noticed that the experimental excess amounts have been converted into the absolute values using the pore volumes measured for the sample outgassed at the corresponding temperature.…”

Section: −1mentioning

confidence: 99%

“…32 Approximately 0.5 g of sample was used for these experiments and first activated ex situ by heating under secondary vacuum at its activation temperature using samplecontrolled thermal analysis for 16 h. For each injection of gas, the equilibrium was assumed to have been reached after 90 min.…”

Section: Adsorption and Calorimetry Measurements The Single-componenmentioning

confidence: 99%

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Structural Origin of Unusual CO₂Adsorption Behavior of a Small-Pore Aluminum Bisphosphonate MOF

et al. 2015

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The adsorption of CO 2 , CH 4 , and N 2 at 303 K by MIL-91(Al), one of the few porous phosphonate-based-MOFs, has been investigated by combining advanced experimental and computational tools. Whereas CH 4 and N 2 adsorption isotherms exhibit type I behavior, the reversible CO 2 isotherm displays an unusual inflection point at low pressure. In situ X-ray powder diffraction and infrared spectroscopy showed structural changes of this small-pore MOF upon CO 2 adsorption. Grand canonical Monte Carlo simulations delivered a detailed picture of the adsorption mechanisms at the microscopic level. The so-predicted arrangements of the confined CO 2 molecules were supported by analysis of the in situ diffraction and infrared experiments. It was shown that while adsorbed CH 4 and N 2 are located mainly in the center of the pores, CO 2 molecules interact with the hydrogen-bonded POH−N acid−base pairs. This results in a relatively high adsorption enthalpy for CO 2 of ca. −40 kJ mol −1 , which suggests that this material might be of interest for CO 2 capture at low pressure (postcombustion).

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Section: Resultsmentioning

confidence: 99%

Section: −1mentioning

confidence: 99%

Section: Adsorption and Calorimetry Measurements The Single-componenmentioning

confidence: 99%

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Structural Origin of Unusual CO₂Adsorption Behavior of a Small-Pore Aluminum Bisphosphonate MOF

et al. 2015

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“…( Figure 2b) is opposite to what is usually observed for cationic zeolites, where the first molecules to be adsorbed are located at the most strongly adsorbing sites. 47 We speculate that the lower initial heats might be associated with the energy that must be expended to allow Li + cations to move away from the framework to coordinate to CO 2 molecules, although the unit cell measurements indicate that expansion continues to pressures corresponding to uptakes of several mmol g -1 . Detailed studies are required to investigate this observation further.…”

Section: Adsorption On Li-rhomentioning

confidence: 99%

Cation Control of Molecular Sieving by Flexible Li-Containing Zeolite Rho

et al. 2016

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The adsorption of CO 2 on zeolite Li-Rho (unit cell composition Li 9.8 Al 9.8 Si 38.2 O 96 ) has been investigated by the measurement of adsorption isotherms (273 -300 K), breakthrough curves with a CO 2 /CH 4 /He mixture (308 K) and in situ synchrotron X-ray powder diffraction in CO 2 (298 K). The Rho framework distorts when in the Li-form to give a shape selective adsorbent for CO 2 over CH 4 , although breakthrough curves reveal diffusional limitations. In situ synchrotron powder XRD follows the expansion of the Li-Rho unit cell upon adsorption, which remains single phase to a CO 2 pressure of ca. 0.6 bar. Partial cation exchange of Li-2 Rho by Na + or Cs + gives two series of M,Li-Rho zeolites (M = Na, Cs). Where the occupancy of window sites (8R, D8R) between lta cages is less than 50%, hysteresis is not observed in CO 2 isotherms at 298 K. For Cs 1.8 Li 8 -Rho, which has a larger unit cell and a wider window than zeolite Li-Rho due to the presence of large Cs + cations in double 8-ring sites, breakthrough curves indicate faster CO 2 diffusion without significant loss of selectivity. We propose this control of adsorption kinetics of the flexible zeolite Rho via modification of cation content as a mechanism for cation controlled molecular sieving.

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“…[4] This apparatus allows the simultaneous measurement of the isotherm and corresponding differential enthalpies of adsorption up to a maximum pressure of 40 bar in the present study.…”

Section: Adsorption Calorimetry At 30°cmentioning

confidence: 99%

MIL-91(Ti), a small pore metal–organic framework which fulfils several criteria: an upscaled green synthesis, excellent water stability, high CO₂selectivity and fast CO₂transport

et al. 2016

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Gas adsorption microcalorimetry and modelling to characterise zeolites and related materials

Cited by 136 publications

References 47 publications

Structural Origin of Unusual CO₂Adsorption Behavior of a Small-Pore Aluminum Bisphosphonate MOF

Structural Origin of Unusual CO₂Adsorption Behavior of a Small-Pore Aluminum Bisphosphonate MOF

Cation Control of Molecular Sieving by Flexible Li-Containing Zeolite Rho

MIL-91(Ti), a small pore metal–organic framework which fulfils several criteria: an upscaled green synthesis, excellent water stability, high CO₂selectivity and fast CO₂transport

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Gas adsorption microcalorimetry and modelling to characterise zeolites and related materials

Cited by 136 publications

References 47 publications

Structural Origin of Unusual CO2Adsorption Behavior of a Small-Pore Aluminum Bisphosphonate MOF

Structural Origin of Unusual CO2Adsorption Behavior of a Small-Pore Aluminum Bisphosphonate MOF

Cation Control of Molecular Sieving by Flexible Li-Containing Zeolite Rho

MIL-91(Ti), a small pore metal–organic framework which fulfils several criteria: an upscaled green synthesis, excellent water stability, high CO2selectivity and fast CO2transport

Contact Info

Product

Resources

About

Structural Origin of Unusual CO₂Adsorption Behavior of a Small-Pore Aluminum Bisphosphonate MOF

Structural Origin of Unusual CO₂Adsorption Behavior of a Small-Pore Aluminum Bisphosphonate MOF

MIL-91(Ti), a small pore metal–organic framework which fulfils several criteria: an upscaled green synthesis, excellent water stability, high CO₂selectivity and fast CO₂transport