Catalytic performance of iron (III) and chromium (III) exchanged pillared clays

Skoularikis, N. D.; Coughlin, Robert W.; Kostapapas, A.; Carrado, Kathleen A.; Suib, S. L.

doi:10.1016/s0166-9834(00)80939-2

Cited by 35 publications

(9 citation statements)

References 13 publications

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“…Most work has focussed on the intercalation of smectites with hydroxy polymers of Cr alone (Pinnavaia et al 1985) or of Cr along with A1 (Carrado et al 1986, Skoularikis et al 1988. These clays are then heated to produce fixed oxide pillars which give the clay catalytic properties.…”

mentioning

confidence: 99%

Electron Microscope Observations of Chromium Hydroxide-Induced Montmorillonite Microclusters

Dubbin

Goh

1995

Clays and clay miner.

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confidence: 99%

Electron Microscope Observations of Chromium Hydroxide-Induced Montmorillonite Microclusters

Dubbin

Goh

1995

Clays and clay miner.

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“…Mixed pillared clays were first synthesized in 1979, but are still scarce. The few reported publications concern A1-Cr (Carrado et al, 1986a,b;Skoularikis et al, 1988), A1-Zr (Occelli & Finseth, 1986;Occelli & Rennard, 1984;Occelli, 1986Occelli, , 1987, A1-Si (Occelli & Rennard, 1984;Occelli, 1986Occelli, , 1987Vaughan et al, 1979Vaughan et al, , 1981Gaaf et al, 1983;Sterte & Shabtai, 1987), A1-Mg (Vaughan etal., 1979, 1981, A1-M (M = transition metal) (Vaughan, 1987), A1-UO2 ++ (Suib et al, 1986); A1-Ga (Bradley et al, 1991) and also AI-Fe (Carrado et al, 1986b;Skoularikis et al, 1988;Kostapapas et al, 1986;Lee & Tatarchuk, 1988;Lee et al, 1989). For most of the mixed pillared clays containing Fe, M6ssbauer spectroscopy was used but did not clarify the location of the Fe atoms and the existence of mixed (A1-Fe) pillars has not been proved.…”

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confidence: 99%

Pillaring of synthetic hectorite by mixed [Al_13-xFe_x] Pillars

Bergaya

Hassoun²,

Barrault³

et al. 1993

Clay miner.

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The pillaring of a Laponite by alumina pillars, iron pillars and mixed AI-Fe pillars was obtained by a simple in situ method starting from A1CI3 and/or FeCI 3 solutions with different molar ratio Fe/(Fe + AI), and from NaOH solution added simultaneously to the clay suspension. The All 3 pillars were evidenced by XRD and NMR spectra. The density and the charge of these pillars were calculated from the chemical analysis. The Fe pillars (in samples with Fe content >26%) are larger than A113 pillars and slowly reducible by hydrogen temperature programmed reduction (H2TPR), but we do not have any information on their structure. There is also an excess of non-pillar Fe retained by the pillared clays probably as oxyhydroxides. The isomorphic substitution in the mixed (A1-Fe)a3 pillars (in samples with an Fe content >26%) was evidenced by H2TPR results compared to the chemical analyses and by the interpretation of the 27A1 peaks in the NMR spectra.

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“…Another possible method to obtain mixed-metalpillared clays has been the introduction of transitionmetal ions by impregnation into the pillared clays, with the pillared clay acting as a support. In this way, pillared clays have been prepared by exchanging cations into clays or into pillared clays, either before or after pillaring (Carrado et al, 1986a,b;Skoularikis et al, 1988;Suzuki et al, 1988). In others works (Bergaya et al, 1993;Bradley et al, 1990a;Fetter et al, 1995;Lee et al, 1989;Occelli, 1986;Shabtai and Fijal, 1986;Sterte and Shabtai, 1987;Vaughan, 1987;Viera Coelho and Poncelet, 1991), pillared clays have been prepared by first combining the transition-metal ion with the pillaring agent, the resulting species being subsequently used to pillar the clay.…”

Section: Introductionmentioning

confidence: 99%

“…In others works (Bergaya et al, 1993;Bradley et al, 1990a;Fetter et al, 1995;Lee et al, 1989;Occelli, 1986;Shabtai and Fijal, 1986;Sterte and Shabtai, 1987;Vaughan, 1987;Viera Coelho and Poncelet, 1991), pillared clays have been prepared by first combining the transition-metal ion with the pillaring agent, the resulting species being subsequently used to pillar the clay. Carrado et al (1986a,b;Skoularikis et al, 1988) reported the synthesis of alumina-pillared clays containing transition-metal ions. Chromium and iron ions were selectively incorporated either into the pillars or into the interlamellar region of the pillared clay.…”

Section: Introductionmentioning

confidence: 99%

Metathesis of Propene on Molybdenum−Alumina-Pillared Montmorillonite

Gil

Montes

1997

Ind. Eng. Chem. Res.

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The preparation, characterization, and catalytic activity of molybdenum-alumina-pillared clays for the metathesis of propene were studied. Two solutions containing molybdenum and aluminum were used in the preparation of the intercalation solutions. In the first, a mixed hydroxy-aluminum-molybdenum solution (MoAl) was prepared by slow addition of NaOH to a solution of mixtures (AlCl 3 and MoCl 5 ). The second solution (Mo + Al) was obtained by dissolving MoCl 5 in an aged solution of aluminum polycation. These solutions were used to prepare two molybdenum-alumina-pillared clays. Finally, an alumina-pillared clay (AlPILC) was used as support and impregnated with a molybdenum solution. Nitrogen adsorption data obtained from very low relative pressures were used for the characterization of the microporosity of the solids. The Dubinin-Radushkevich formalism was used to describe the volume filling of micropores and confirmed the existence of a bimodal distribution of the micropore sizes in the pillared clays. The micropore distributions obtained by the Horvath-Kawazoe approach for the two molybdenum-alumina-pillared clays showed a modification of their microporous surface with respect to the AlPILC. The acidity and catalytic activity in the propene metathesis reaction of the molybdenum-alumina-pillared clays and a comparison with two reference catalysts (Mo/ SiO 2 and Mo/Al 2 O 3 ) are also reported.

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Catalytic performance of iron (III) and chromium (III) exchanged pillared clays

Cited by 35 publications

References 13 publications

Electron Microscope Observations of Chromium Hydroxide-Induced Montmorillonite Microclusters

Electron Microscope Observations of Chromium Hydroxide-Induced Montmorillonite Microclusters

Pillaring of synthetic hectorite by mixed [Al_13-xFe_x] Pillars

Metathesis of Propene on Molybdenum−Alumina-Pillared Montmorillonite

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Catalytic performance of iron (III) and chromium (III) exchanged pillared clays

Cited by 35 publications

References 13 publications

Electron Microscope Observations of Chromium Hydroxide-Induced Montmorillonite Microclusters

Electron Microscope Observations of Chromium Hydroxide-Induced Montmorillonite Microclusters

Pillaring of synthetic hectorite by mixed [Al13-xFex] Pillars

Metathesis of Propene on Molybdenum−Alumina-Pillared Montmorillonite

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Pillaring of synthetic hectorite by mixed [Al_13-xFe_x] Pillars