Characterization, pillaring and catalytic properties of a saponite from Vicálvaro, Madrid, Spain

Casal, Blanca; Merino, Jesús; Ruiz‐Hitzky, Eduardo; Gutiérrez, Edixón; Álvarez, Antonio Merchán

doi:10.1180/claymin.1997.032.1.06

Cited by 24 publications

(25 citation statements)

References 17 publications

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“…Beyond the PZC, the excess MB reversed the sign of clay charge from negative to positive (Figure 7), indicating specific adsorption of the cationic dye on the external clay surface, probably as aggregates (dimers, trimers, etc.) (Bergmann and O'Konski, 1963;Cenens and Schoonheydt, 1988) or over other active centers, such as Si-OH groups, by hydrogen bonding (Casal et al, 1997). Knowing the surface area of one MB cation (a MB = 130 Å 2 ) on one hand, and taking into account the values of the PZC determined above on the other hand, the specific surface areas of the raw clay and its purified <2 mm fraction were found to be~302 and 446 m 2 /g, respectively.…”

Section: Cation Exchange Capacity (Cec) and Chemical Analysismentioning

confidence: 95%

Mineralogical and Physico-Chemical Characterizations of Ferruginous Beidellite-Rich Clay from Agadir Basin (Morocco)

Bouna

Rhouta

Daoudi³

et al. 2012

Clays and clay miner.

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 14098To link to this article :Abstract-The mechanism of formation of detrital, beidellite-rich clay occurring in the Agadir basin (Morocco) is well documented, but its detailed characterization is incomplete which limits its application. The aim of the present study was to provide further details of the mineralogical and physico-chemical characteristics of this clay. Bulk raw clay and its Na + -saturated, <2 mm fraction were characterized using chemical, structural, and thermal techniques. Measurements of induced streaming potential (e.g. particle charge) and of specific surface area and porous volume are reported. The raw clay contained carbonate and quartz as associated minerals along with phyllosilicates (<2 mm particle size). X-ray diffraction and scanning electron microscopy analyses showed that the <2 mm fraction was dominated by a dioctahedral smectite. Because dehydroxylation of this mineral occurred at 510ºC, and because it re-expanded in ethylene glycol after Li + -saturation followed by heating at 240ºC for 24 h, the mineral was shown to be a beidellite rather than montmorillonite. This assertion was further supported by 27 Al and 29 Si magic-angle spinning nuclear magnetic resonance spectra showing predominantly negative charges in the tetrahedral sheets due to notable Al-for-Si substitutions. The chemical composition of the <2 mm fraction showed an Fe 2 O 3 content which was~7.52 wt.% greater than those of other beidellite occurrences but not so much that it would be identified as a nontronite. The absence of stretching and bending absorption bands corresponding to characteristic (Fe 2 OH) units in mid-infrared spectra and their corresponding fundamental overtones or combination bands in near-infrared spectra supported this notion. The structural formula of the beidellite in the present study was determined to be (Si 7.51 Al 0.49 )(Al 2.99 Fe 0.68 Mg 0.33 ) (Ca 0.03 Na 0.54 Mg 0.11 )O 20 (OH) 4 , having dioctahedral ferruginous characteristics with almost 60% of the negative charge found in tetrahedral sheets. The cation exchange capacity determined from the structural formula was~108 meq/100 g. The specific surface area and total pore volume were~82.2 m 2 /g and 0.136 cm 3 /g, respectively. Interestingly, a detrital rather than a hydrothermal-alteration origin, as reported for other beidellite occurrences, explains its natural abundance and emphasizes the great interest in it.

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Section: Cation Exchange Capacity (Cec) and Chemical Analysismentioning

confidence: 95%

Mineralogical and Physico-Chemical Characterizations of Ferruginous Beidellite-Rich Clay from Agadir Basin (Morocco)

Bouna

Rhouta

Daoudi³

et al. 2012

Clays and clay miner.

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“…Sin embargo, aunque los yacimientos de la Cuenca del Tajo contienen aproximadamente el 70% de la reserva mundial de sepiolita 70 , no es esta la única arcilla magnésica existente en el entono Vicálvaro -Vallecas. Las explotaciones de sepiolita en la Cuenca Neógena de Madrid, incluyen secuencias que oscilan entre 10 y 50 m de potencia, en que las esmectitas trioctaédricas de carácter magnésico 71 (saponita 72 o estevensita 73 ) alternan con sepiolita y/o minerales micáceos 74 . Es probable, como se ha dicho, que Sureda ensayara "la tierra de Vallecas" durante su estancia en París e incluso que esta tierra hubiera sido utilizada en las primeras etapas de la Fábrica del Buen Retiro.…”

Section: Materias Primasunclassified

La porcelana de sepiolita de Bartolomé Sureda (1802-1808). Investigación arqueométrica sobre la Real Fábrica de Buen Retiro

Pascual¹,

Criado²,

Recio³

et al. 2011

Bol. Soc. Esp. Ceram. Vidr.

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Este trabajo considera el estudio arqueométrico de un tipo de porcelana muy poco frecuente que se elaboró en los últimos años de la Real Fábrica de Porcelanas del Buen Retiro (1803-1808) bajo la dirección de Bartolomé Sureda. El análisis químico y mineralógico de una selección de fragmentos de vajillas, azulejos y esculturas, que se encontraron en la excavación arqueológica (1996) del solar de la fábrica, ratifica la producción de un nuevo tipo de porcelana dura, en la que se empleaba una arcilla de magnesio, la sepiolita, en lugar del caolín. Las características de las pastas y los vidriados y la investigación del contexto histórico y científico de la porcelana y la cerámica blanca en Europa han permitido establecer los motivos y los parámetros de su producción. La reproducción de la pasta a escala de laboratorio confirma las materias primas utilizadas y el tratamiento térmico empleado. Palabras clave: Keywords: SEM-EDS, Arqueometría, Porcelana, Diagramas de fase, Buen Retiro, Sureda, Siglo XIX. Bartolomé Sureda's sepiolitic porcelain (1803-1808). Archaeometric study of the Buen Retiro Royal Porcelain Manufacture.This work deals with an original class of porcelain produced under the direction of Bartolomé Sureda in the last years (1803-1808) of the Royal Porcelain Factory of Buen Retiro. The results of the chemical and mineralogical analysis of a selection of tableware, tiles and sculpture shards, found in the archaeological excavation (1996) of the site where the factory was built, confirm the production of a new hard-paste porcelain where the kaolin was substituted by a magnesium clay, the sepiolite. The characteristics of pastes and glazes and the investigation of the historic and scientific contexts of porcelain and white earthenware in Europe have allowed establishing the reasons and the technical parameters of this production. Replicas of the paste were done in the laboratory to assert the raw materials and the firing conditions of this porcelain.

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“…Natural saponite shows a high specific surface area value, characteristic of saponites in the Madrid Basin, owing to their small particle size, derived from the sedimentary origin of these deposits [29,30]. The specific surface area and the microporosity increase from the natural clay (191 m 2 g -1 ) to the pillared solid (230 m 2 g -1 ).…”

Section: Characterization Of Ni-claysmentioning

confidence: 98%

Ni/Pillared Clays as Catalysts for the Selective Catalytic Reduction of Nitrogen Oxides by Propene

et al. 2008

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Different and alternative methods for the preparation of Ni/pillared clays based on impregnation and encapsulation procedures are reported. Several nickel precursors and metal loadings are considered in order to evaluate their influence on the structural, textural and catalytic properties of the resulting solids. The behaviour of the optimum solids as catalysts has been proved in the selective catalytic reduction of nitrogen oxides with propene, and the relevance of the oxidant nature was checked by changing the composition of the oxidant mixture. Of all the factors studied, the nature of the nickel precursors appears as the most important one, owing to the formation of different active nickel species during the synthesis procedure.

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Characterization, pillaring and catalytic properties of a saponite from Vicálvaro, Madrid, Spain

Cited by 24 publications

References 17 publications

Mineralogical and Physico-Chemical Characterizations of Ferruginous Beidellite-Rich Clay from Agadir Basin (Morocco)

Mineralogical and Physico-Chemical Characterizations of Ferruginous Beidellite-Rich Clay from Agadir Basin (Morocco)

La porcelana de sepiolita de Bartolomé Sureda (1802-1808). Investigación arqueométrica sobre la Real Fábrica de Buen Retiro

Ni/Pillared Clays as Catalysts for the Selective Catalytic Reduction of Nitrogen Oxides by Propene

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