Preparación y propiedades de una arcilla montmorillonita pilareada con polihidroxicationes de aluminio

Pergher, Sibele B. C.; Corma, Avelino; Fornés, Vicente

doi:10.1590/s0100-40421999000500004

Cited by 11 publications

(9 citation statements)

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“…In montmorillonites, which belong to this group, isomorphic substitutions occur in which the resulting negative charge is compensated by the adsorption of hydrated cations into the interlayer region 1,2 . These properties are useful for different industrial applications, such as in catalysis and adsorption, and can be modified using the pillarization process with aluminum polioxocations, which provides a permanent porosity and a Lewis acid characteristic to the material 3 . Acid treatments also result in an increase of the porosity in clays.…”

Section: Introductionmentioning

confidence: 99%

Acid treatments of montmorillonite-rich clay for Fe removal using a factorial design method

et al. 2013

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Montmorillonite clays are of great interest for industrial processes such as catalysis and adsorption. The textural properties of clays can be modified in an attempt to increase their uses. This paper describes the acid treatment of natural montmorillonite clay. The materials were characterized using X-ray diffraction (XRD), atomic absorption spectroscopy (AA) and BET surface area measurements. Three different acids (HCl, HNO 3 and H 2 SO 4 ) were tested, and HCl and H 2 SO 4 were more efficient for removing Fe from the clay. The results indicate that HCl better preserves the material structure because less Al is removed. A central composite design (CCD) 2 2 was applied to evaluate the treatment using /75 °C, assured that Fe was removed with less damage to the structure.

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Section: Introductionmentioning

confidence: 99%

Acid treatments of montmorillonite-rich clay for Fe removal using a factorial design method

et al. 2013

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“…The pillaring processes were developed with intercalation of Al 13 O 4 (OH) 24 (H 2 O) 12 7+ /Ti(OC 2 H 5 ) 4 and Al 13 O 4 (OH) 24 (H 2 O) 12 7+ /ZrOCl 2 ·6H 2 O. Various parameters related to the chemical compositions of the matrices, temperature of calcination, synthetic methodology to obtain PILC and zinc adsorption from aqueous solution at room temperature have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive, thermodynamic and kinetic performances of Al/Ti and Al/Zr-pillared clays from the Brazilian Amazon region for zinc cation removal

Guerra

Airoldi

Lemos

et al. 2008

Journal of Hazardous Materials

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“…It shows the diffraction peak position at 4.7º, which corresponds to basal space of 18.95 Å. The crystallinity can be inferred by the broadening of the peak [16] and the less intense peak at 9.2º and basal distance 9.6 Å for samples (c) and (d) respectively are typical of collapsed layers on nontronite [27]. Table I presents the mentioned structural parameters.…”

Section: Physical and Chemical Characterizationmentioning

confidence: 99%

N-octane catalytic isomerization with aluminium and aluminiumlanthanum pillared nontronite

et al. 2015

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Nontronite samples pillared with aluminium (Pt/Al-PilM) and aluminium-lanthanum (Pt/AlLa-PilM) were prepared from natural nontronite, characterized and tested as catalyst in n-octane hydroisomerization reaction. The results were compared with those obtained from the same reaction using commercial Y-zeolite impregnated with platinum (Pt-Y). Experiments with commercial zeolite show that platinum is essential to maintain the reactional selectivity of the products. The conversion capacities of (Pt/AlPilM) and (Pt/AlLa-PilM) were 70% and 40%, respectively, surpassing the Pt-Y performance of 30%, but with the same selectivity. X-ray diffraction data show that organic matter oxidation followed by cationic homogenization is of paramount importance for pillared clay preparation. Keywords: pillared nontronite, aluminium-lanthanum pillars, n-octane isomerization, platinum impregnation. (Pt/Al-PilM) Resumo Amostras de nontronita pilarizadas com alumínio (Pt/Al-PilM) e alumínio-lantânio (Pt/AlLa-PilM) foram preparadas a partir de nontronita natural, caracterizadas e testadas como catalisador na reação de hidroisomerização do n-octano. Os resultados foram comparados com os obtidos da mesma reação, usando zeólita Y comercial impregnada com platina (Pt-Y). Experimentos com zeólita comercial mostraram que a platina é essencial para manter a seletividade reacional dos produtos. A capacidade de conversão das amostras

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Preparación y propiedades de una arcilla montmorillonita pilareada con polihidroxicationes de aluminio

Cited by 11 publications

References 0 publications

Acid treatments of montmorillonite-rich clay for Fe removal using a factorial design method

Acid treatments of montmorillonite-rich clay for Fe removal using a factorial design method

Adsorptive, thermodynamic and kinetic performances of Al/Ti and Al/Zr-pillared clays from the Brazilian Amazon region for zinc cation removal

N-octane catalytic isomerization with aluminium and aluminiumlanthanum pillared nontronite

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