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 10 publications

(7 citation statements)

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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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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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“…Determinations were performed on a Shimadzu thermal analyzer, TA 50 model, under N 2 atmosphere with a flux of 20 mL•min −1 and the rate of heating 20˚C•min −1 using a platinum pan [20]. The calibration curve was obtained under the same conditions with an empty pan, which was subtracted from the experimental curves.…”

Section: Thermogravimetric Analysis (Tg)mentioning

confidence: 99%

Mineralogical Horizon (A) Evaluation of a Toposequence of Soils Derived from Basalt by Thermal Analysis

Peternele¹,

Costa²

2014

JMMCE

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Thermogravimetry (TG) is a technique where the mass change of a substance is evaluated in function of temperature or time at a constant temperature while submitted to a controlled program in a specific environment. The minerals obtained from a clay fraction are highly susceptible to significant changes in composition as a response to thermal processes in function of temperature or dynamic as a function of time at a constant temperature. Thermogravimetric curves (TG) show mass changes preferentially during the heating processes. The DTG curve derived from the TG curve, shows changes in the inclination that are not exposed in the TG curve. DTG curve thus can show higher values of mass loss which are associated to an elevated degree of weathering for those reactions which involve mass changes, such as desorption, dehydration and reactions of dehydroxilation, observed in clay fraction without iron oxide-hydroxide, indicating kaolinite as a dominant mineral, with higher value 70.97% of the fraction to soil class LVdf.

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

Cited by 10 publications

References 0 publications

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

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

Mineralogical Horizon (A) Evaluation of a Toposequence of Soils Derived from Basalt by Thermal Analysis

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