Study of n-hexane adsorption in MCM-41 mesoporous materials: a scaling effect approach of capillary condensation processes

Trens, Philippe; Tanchoux, Nathalie; Maldonado, Daniel Bonilla; Galarneau, Anne; Renzo, Francesco Di; Fajula, François

doi:10.1039/b401094a

Cited by 34 publications

(31 citation statements)

References 21 publications

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“…In Fig. 1, it can be noticed that for the 2.3 MCM-41 the monolayer capacity forms after capillary condensation, which agrees with former findings [15]. Further, in the case of the 3.7 MCM-41 and the 4.4 MCM-41 materials, the monolayer capacity is reached at the very beginning of capillary condensation which again suggests that these systems are also at the border of Scheme 1.…”

Section: Adsorption Of 1-hexene On Mcm-41 Catalystssupporting

confidence: 90%

“…The apparatus is placed in a climatic chamber allowing a thermal stability better than 0.1 K from 250 K up to 350 K. The sample cell can be disconnected from the system to undergo a thermal treatment up to 523 K (if compatible with the thermal stability of the materials) under a vacuum of 10 À3 Torr. The full description of this apparatus has already been published [15].…”

Section: Textural Characterizationmentioning

confidence: 99%

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Heterogeneous catalysis and confinement effects

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Trens

Fajula

et al. 2006

Applied Catalysis A: General

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Section: Adsorption Of 1-hexene On Mcm-41 Catalystssupporting

confidence: 90%

Section: Textural Characterizationmentioning

confidence: 99%

Heterogeneous catalysis and confinement effects

Pariente

Trens

Fajula

et al. 2006

Applied Catalysis A: General

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“…Values of the adsorption heats obtained for other silicas are smaller and agree well with the literature data (Trens et al 2004). Smaller differences between the Henry and BET adsorption heats confirm homogeneity of the surface adsorption sites in these materials, which increases with the increasing diameter of the mesopores.…”

Section: Mesoporous Silicassupporting

confidence: 79%

Application of quasi-equilibrated thermodesorption of hexane and cyclohexane for characterization of porosity of zeolites and ordered mesoporous silicas

et al. 2013

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Quasi equilibrated temperature programmed desorption and adsorption (QE-TPDA) of hexane and cyclohexane was applied for characterization of zeolites 5A, ZSM-5, 13X, Y, NaMOR and ordered mesoporous silicas MCM-41, MCM-41/TMB, SBA-15 and HMS. Similar QE-TPDA profiles of hexane and cyclohexane with a single desorption maximum were observed for the wide pore zeolites. No adsorption of cyclohexane for zeolite 5A and a single desorption maximum for ZSM-5 were found, while two-step desorption profiles of hexane were observed for these zeolites. Similar values of the adsorption enthalpy and entropy of hexane and cyclohexane were obtained by fitting the Langmuir model functions for the zeolites X and Y. For NaMOR and ZSM-5 larger differences in these parameters were found. A single desorption peak found at low temperatures in the QE-TPDA profiles of hexane and cyclohexane for the studied silicas was attributed to the multilayered adsorption on their mesopore surface. The adsorption isobars calculated from the thermodesorption profiles were fitted with the BET function. This way values of the specific surface area and the adsorption heat were calculated. Additionally values of the initial heat of adsorption were found by fitting the Henry's law to the high-temperature sections of the linearized isobars. The largest deviations from the BET and Henry functions and the largest values of the adsorption heats found for SBA-15 indicated the greatest heterogeneity of the adsorption sites on its surface.

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“…The vapour sorption experiments were performed with a set-up developed in our laboratory. [26,27] The adsorbed amounts could be determined by the equilibrium pressure difference before and after adsorption steps. For reaching the appropriate accuracy, two capacitive pressure gauges of 10 Torr and 1000 Torr were used.…”

Section: Introductionmentioning

confidence: 99%