A microcalorimetric comparison of the adsorption of various gases on two microporous adsorbents: a model aluminophosphate and a natural clay

Tosi-Pellenq, N.; Grillet, Y.; Rouquérol, J.; Llewellyn, Philip L.

doi:10.1016/0040-6031(92)80317-p

Cited by 26 publications

(14 citation statements)

References 11 publications

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“…The channels (11.5 Å Â 5.3 Å ) that move along the fibres confer the solid a microporous structure with a high surface area, similar to that of the AlPO-5 [62][63][64]. The extraction of the ions (i.e.…”

Section: Effect Of Different Parameters On the Enzymatic Activitymentioning

confidence: 98%

Sustainable preparation of a novel glycerol-free biofuel by using pig pancreatic lipase: Partial 1,3-regiospecific alcoholysis of sunflower oil

Caballero

Bautista

Campelo

et al. 2009

Process Biochemistry

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Section: Effect Of Different Parameters On the Enzymatic Activitymentioning

confidence: 98%

Sustainable preparation of a novel glycerol-free biofuel by using pig pancreatic lipase: Partial 1,3-regiospecific alcoholysis of sunflower oil

Caballero

Bautista

Campelo

et al. 2009

Process Biochemistry

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“…6 The isosteric heat of adsorption curve calculated with the PN type potential model reproduces quite well the experimental characteristic heat of adsorption behavior. 5,6 Isosteric heats calculated with M4 and M5 model are shown in Figure 3. Experimentally, the isosteric heat of adsorption increases slowly between 0 and 4 molecules adsorbed per unit cell; at a loading of 4 molecules it decreases by about 2 kJ‚mol -1 , increases again, and falls to zero at the maximum of loading.…”

Section: Adsorption Isotherms and Calorimetricmentioning

confidence: 99%

Molecular Simulation Study of the Structural Rearrangement of Methane Adsorbed in Aluminophosphate AlPO₄-5

et al. 1996

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Grand canonical Monte Carlo simulations have been performed for methane adsorbed in the aluminophosphate AlPO 4 -5. Several approaches were used in order to model the methane-methane as well as the methaneadsorbent interactions. It is shown that a potential function of the Pellenq and Nicholson (PN) type, which includes two-body, three-body dispersion terms, induced interactions and exponential repulsions with each individual framework species can adequately describe the experimentally observed substep in the adsorption isotherms. The correspondence between the calculated and experimental adsorption isotherms, assuming a rigid microporous crystal, confirms that the observed substep may be attributed to a structural rearrangement of the adsorbed phase, similar in nature to a phase transition. A good agreement was also found between the simulated and experimental isosteric heats of adsorption curves. The pressure at which the step is observed in the simulations depends crucially on the value of the repulsive oxygen-methane parameter. Two structures of the adsorbed phase with maximum loading were found, using slightly different values of this latter parameter. Calculated neutron diffraction spectra for both structures agree fairly well with experiments. These two phases are presumably close to each other in energy and stability and further experiments are needed in order to conclude on the exact nature of the confined methane structure at high pressure.

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“…More recently, Grillet et al have measured a methane sorption isotherm characterized by a substep existence in the high-loading regime. In addition, an exothermic heat peak is observed at the same CH 4 sorbed quantity. , Hitherto, such phase transitions in sorbate species have been pointed out only during the sorption of simple gases (i.e., Ar, Kr, N 2 , and CO) in silicalite-I. − Silicalite-I, which is the pure silicic form of the MFI-type zeolite, has a rather complex inner surface composed of at least three kinds of sorption sites and a complex micropore network constituted of straight channels and sinusoidal channels.…”

Section: Introductionmentioning

confidence: 99%

Sorption Properties of AlPO₄-5 and SAPO-5 Zeolite-like Materials

et al. 1998

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We have studied by volumetric adsorption isotherm measurements the sorption properties of different AlPO4-5 or SAPO-5 samples, for sorbate species characterized by a large range of molecular size: D2, Kr, Ar, C2D2, CO2, CH4, CF4, and C(CH3)4. The highest sorption capacities, Q max, greatly depend on the sorbate molecular size. A difference of 1 order of magnitude is observed between hydrogen and neopentane. In addition, we have found that the sorption capacities of the four analyzed AlPO4-5 or SAPO-5 samples vary by almost a factor of 2. This result clearly shows that, as a consequence of the one-dimensional character of the AFI micropore network, Q max is very sensitive to small amounts of crystalline defects or impurities. For methane, Q max is equal to 6 mol/uc, a quantity that is not compatible with the commonly accepted value of the internal diameter of the AlPO4-5 micropore diameter, ⌀M = 7.3 Å. Moreover, an interesting phase transition phenomenon has been observed during the sorption of krypton and methane, a result that can be the consequence of the good parametric agreement between such sorbate species and the AlPO4-5 inner surface.

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A microcalorimetric comparison of the adsorption of various gases on two microporous adsorbents: a model aluminophosphate and a natural clay

Cited by 26 publications

References 11 publications

Sustainable preparation of a novel glycerol-free biofuel by using pig pancreatic lipase: Partial 1,3-regiospecific alcoholysis of sunflower oil

Sustainable preparation of a novel glycerol-free biofuel by using pig pancreatic lipase: Partial 1,3-regiospecific alcoholysis of sunflower oil

Molecular Simulation Study of the Structural Rearrangement of Methane Adsorbed in Aluminophosphate AlPO₄-5

Sorption Properties of AlPO₄-5 and SAPO-5 Zeolite-like Materials

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A microcalorimetric comparison of the adsorption of various gases on two microporous adsorbents: a model aluminophosphate and a natural clay

Cited by 26 publications

References 11 publications

Sustainable preparation of a novel glycerol-free biofuel by using pig pancreatic lipase: Partial 1,3-regiospecific alcoholysis of sunflower oil

Sustainable preparation of a novel glycerol-free biofuel by using pig pancreatic lipase: Partial 1,3-regiospecific alcoholysis of sunflower oil

Molecular Simulation Study of the Structural Rearrangement of Methane Adsorbed in Aluminophosphate AlPO4-5

Sorption Properties of AlPO4-5 and SAPO-5 Zeolite-like Materials

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Molecular Simulation Study of the Structural Rearrangement of Methane Adsorbed in Aluminophosphate AlPO₄-5

Sorption Properties of AlPO₄-5 and SAPO-5 Zeolite-like Materials