Selective liquid sorption and wetting of pillared montmorillonites

AbstractPillared montmorillonite was used as an adsorbent for binary mixtures of hydrocarbons and alcohols (benzene/n-heptane; ethanol/cyclohexane; ethanol/toluene; propanol/ toluene). The adsorbent was prepared from the Na-form of a bentonite from Milos by reaction with polyhydroxoaluminium solutions. The adsorption behaviour of the pillared montmorillonite was characterized by the adsorption excess isotherms and the heats of immersion. Sorption capacities and wetting properties differed significantly from those of the Na-montmorillonite. Benzene was adsorbed preferentially from mixtures with n-heptane. Ethanol and propanol were also preferentially adsorbed from mixtures with cyclohexane and toluene but the curves showed azeotropic points at molar fractions of alcohols of 0.7-0.9. The calorimetric data revealed the partially hydrophobic character of the pillared montmorillonite. The heat of wetting of benzene or toluene on the pillared samples was distinctly higher than that of ethanol whereas ethanol gave the highest wetting enthalpies on Na-montmorillonite.

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Heat of Wetting of Carbon by Liquid Binary Mixtures

The Journal of Physical Chemistry ◽

10.1021/j150305a008 ◽

1929 ◽

Vol 33 (11) ◽

pp. 1758-1768 ◽

Cited By ~ 8

Author(s):

F. E. Bartell ◽

Ying Fu

Keyword(s):

Binary Mixtures ◽

Heat Of Wetting ◽

Liquid Binary Mixtures

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Wetting properties of simple binary mixtures and systems with one self‐associating component

The Journal of Chemical Physics ◽

10.1063/1.467104 ◽

1994 ◽

Vol 100 (8) ◽

pp. 5913-5921 ◽

Cited By ~ 6

Author(s):

C. Pérez ◽

P. Roquero ◽

V. Talanquer

Keyword(s):

Binary Mixtures ◽

Wetting Properties

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Preparation and Catalytic Performance of Fe-Cr-Si-Pillared Montmorillonite as Coal Liquefaction Catalyst

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.557-559.1629 ◽

2012 ◽

Vol 557-559 ◽

pp. 1629-1632

Author(s):

Xing Shun Cong ◽

Min Li

Keyword(s):

Catalytic Performance ◽

Silica Sol ◽

High Thermal Stability ◽

Coal Liquefaction ◽

Basal Spacing ◽

X Ray Diffraction ◽

X Ray ◽

Pillared Montmorillonite ◽

Pillared Montmorillonites ◽

Coal Residue

A set of pillared montmorillonite (PILM) catalysts were prepared by exchanging Na+ with iron pillars, chromium pillars, complexes pillars of iron and chromium with different proportion, as well as complexes pillar of silica sol and iron and chromium, respectively. X-ray diffraction (XRD), X-ray fluorescence (XRF), thermogravimetry (TG) and differential thermal analysis (DTA) were used to characterize the catalysts. The XRD results reveal that Fe-Cr complexes pillared montmorillonites (Fe/Cr-PILM) have the basal spacing of about 2.04 nm after calcination at 300 °C for 2 h, while sole metal PILM have that of about 1.0 nm; in particular, the basal spacing of silica sol complexes pillared montmorillonite (Fe-Cr-Si-PILM) are expanded up to 4.33 nm. The TG-DTA results show that both Fe-Cr-PILM and Fe-Cr-Si-PILM have high thermal stability up to 640 °C. Catalytic activity of Fe/Cr-Si-PILM in Longkou lignite (LL) and ShengLi coal residue (SCR) liquefaction was studied, which showed that PILM had a good catalytic performance in coal conversion field.

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Adsorption behaviour of the binary mixtures of octane and nonane at sub-monolayer coverage on graphite

Physical Chemistry Chemical Physics ◽

10.1039/b102054o ◽

2001 ◽

Vol 3 (17) ◽

pp. 3774-3777 ◽

Cited By ~ 13

Author(s):

Miguel Castro ◽

Stuart M. Clarke ◽

Akira Inaba ◽

Robert K. Thomas ◽

Thomas Arnold

Keyword(s):

Binary Mixtures ◽

Adsorption Behaviour ◽

Monolayer Coverage

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PREPARATION AND CATALYTIC ACTIVITY FOR ISOPROPYL BENZENE CRACKING OF Co, Mo AND Co/Mo-Al2O3-PILLARED MONTMORILLONITE CATALYSTS

Indonesian Journal of Chemistry ◽

10.22146/ijc.21528 ◽

2010 ◽

Vol 9 (2) ◽

pp. 189-194 ◽

Cited By ~ 1

Author(s):

Hasanudin Hasanudin ◽

Karna Wijaya ◽

Budi Santoso

Keyword(s):

Catalytic Activity ◽

Total Pore Volume ◽

Raw Material ◽

Spectroscopy Analysis ◽

Pillared Montmorillonite ◽

Ft Ir ◽

Pillared Montmorillonites ◽

And Performance ◽

Adsorption Desorption ◽

Isopropyl Benzene

It has been prepared Co, Mo and Co/Mo-Al2O3-pillared montmorillonite catalysts using montmorillonite clay as raw material. The structure and porosity of the catalysts were determined using N2 adsorption-desorption and FT-IR spectroscopy analysis methods. Isopropyl benzene cracking using these catalysts were used to test the catalytic activity and performance of Co, Mo and Co/Mo-Al2O3-pillared montmorillonites. Characterization results showed that pillarization resulted in the increase of the total pore volume and specific surface area of the clay. Meanwhile, transition metals (Co, Mo and Co/Mo) loaded on Al2O3-pillared monmorillonites could increase the catalytic activity of the catalysts for isopropyl benzene cracking significantly. Keywords: pillared monmorillonite, isopropyl benzene and cracking catalyst

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Wetting properties of the sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and polyoxyethylene (23) lauryl ether (Brij 35) binary mixtures in the poly(tetrafluoroethylene)-solution-air system

Annales Universitatis Mariae Curie-Sklodowska sectio AA – Chemia ◽

10.1515/umcschem-2015-0010 ◽

2015 ◽

Vol 70 (1) ◽

Cited By ~ 1

Author(s):

Joanna Krawczyk

Keyword(s):

Surface Tension ◽

Aqueous Solutions ◽

Binary Mixtures ◽

Critical Surface ◽

Surface Wetting ◽

Critical Surface Tension ◽

Wetting Properties ◽

Ptfe Surface ◽

Brij 35 ◽

Lauryl Ether

AbstractWettability of poly(tetrafluoroethylene) (PTFE) by aqueous solutions of binary mixtures composed of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) with polyoxyethylene (23) lauryl ether (Brij 35) was considered on the basis of the measured values of contact angle and surface tension. It was shown that the value of the critical surface tension of PTFE surface wetting at the studied system (23.5 mN/m), does not depend on the concentration and composition of the binary mixtures of studied surfactants in water, and it was higer than the surface tension of PTFE (20.2 mN/m). The best wettability of polytetrafluoroethylene (PTFE) by studied aqueous solutions of binary surfactants mixtures occurs at the mixtures concentration corresponding to the critical micelle concentration of their solutions.

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Preparation and Characterization of Chitosan/Hdroxy-Aluminium Pillared Montmorillonite Nanocomposites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.334-335.825 ◽

2007 ◽

Vol 334-335 ◽

pp. 825-828 ◽

Cited By ~ 1

Author(s):

Wei Tan ◽

Yi He Zhang ◽

Yau Shan Szeto ◽

Li Bing Liao

Keyword(s):

Metal Ions ◽

Chitosan Solution ◽

Exchange Capacity ◽

X Ray Diffraction ◽

X Ray ◽

Pillared Montmorillonite ◽

Pillared Montmorillonites ◽

Cationic Exchange ◽

Montmorillonite Nanocomposites

It was shown that chitosan and hydroxy-aluminum pillared montmorillonites were excellent materials for the removal of dyes and metal ions from effluent of dying and finishing. Chitosan/ hydroxy-aluminum pillared montmorillonite nanocomposites are expected to play a multiplex role in the treating process. In this study, the nanocomposite was prepared by incorporating hydroxy-aluminum pillared montmorillonite into chitosan solution that diluted acetic acid was used as solvent for dissolving the chitosan. The ratio of chitosan to the cationic exchange capacity of the montmorillonite was about 1:1, 2:1, 3:1, 4:1 and 6:1, respectively. The nanocomposites were characterized by XRD (X-ray diffraction), SEM (Scanning Electron Microscopy). The experimental results indicated that the presence of hydroxy-aluminum cation was in favor of the chitosan intercalation and the interlayers of MMT was intercalated with the bilayers of chitosan sheets. and they can be used in absorption of organic and metal ions for dying and finishing effluent.

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On the role of partition and surface reactions in the adsorption of binary liquid mixtures on silica gel

Canadian Journal of Chemistry ◽

10.1139/v88-222 ◽

1988 ◽

Vol 66 (6) ◽

pp. 1371-1378

Author(s):

Prem P. Singh ◽

Krishan K. Sharma

Keyword(s):

Binary Mixtures ◽

Silica Gel ◽

Surface Reaction ◽

Adsorption Process ◽

Surface Reactions ◽

Liquid Mixtures ◽

Adsorption Behaviour ◽

Binary Liquid ◽

Distribution Process

The adsorption behaviour of benzene (A), toluene (A), p-xylene (A), and o-xylene (A) in their binary mixtures with o-chlorotoluene (B) on silica gel has been studied at 308.15 K. The data have been analysed in terms of a model that assumes that partition and surface reactions play an important role in the adsorption process, and have revealed that while both partition and surface reactions dictate the adsorption (U-shaped isotherms) of o-chlorotoluene (OCTE) (B) from benzene (A) or toluene (A) + OCTE (B) mixtures, the adsorption of A and B entities of p-xylene (A) or o-xylene (A) + OCTE (B) mixtures (S-shaped isotherms) onto the silica gel surface is governed primarily by the distribution process and secondarily by the surface reaction.

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Time-dependent changes of adsorption and wetting properties of pillared montmorillonites

Clay Minerals ◽

10.1180/000985500547214 ◽

2000 ◽

Vol 35 (5) ◽

pp. 763-769 ◽

Cited By ~ 2

Author(s):

I. Dékány ◽

V. Seefeld ◽

G. Lagaly

Keyword(s):

Room Temperature ◽

Total Pore Volume ◽

Adsorption Properties ◽

Time Dependent ◽

Basal Spacing ◽

Wetting Properties ◽

Surface Character ◽

Activated Bentonite ◽

Pillared Montmorillonites ◽

Enthalpy Of Immersion

AbstractThe changes of adsorption properties of uncalcined Al-pillared montmorillonite were studied. A soda-activated bentonite from Slovakia was reacted with polymeric hydroxoaluminium salt solutions. During storagein air at room temperature for three years, the basal spacing decreased by 0.15–0.2 nm; the specific surface area was reduced by 80% and the total pore volume by 40–60%. Adsorption experiments from ethanol-cyclohexane mixtures revealed the decreasing adsorption capacity and the increasing hydrophobicity. The changing surface character was also evident in the decrease in enthalpy of immersion in ethanol from 65.3 J/g to 8.3 J/g (sample B) and from 37.8 J/g to 5.2 J/g (sample C). The alteration probably arises from gradual formation of gibbsite-like interlayers and the redistribution of charges.

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