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Prieto, O.; Vicente, M.A.; Ban̄ares-Muñoz, M.A.

doi:10.1023/a:1009657312123

Cited by 37 publications

(23 citation statements)

References 22 publications

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“…The acid-treatment of Na-TSM also led to an increase in specific surface area and pore volume although the values for acid-treated Na-TSM were much smaller those for acid-treated APMs. Several studies have been conducted on the acid leaching of swellable or non-swellable clay minerals to obtain porous solids [13][14][15][16][17][18][19][20][21][22][23][24]. These studies have yielded porous silica having micro-or mesopores depending on both the species of starting clay mineral and the leaching conditions.…”

Section: Methodsmentioning

confidence: 99%

“…Although saponite, a magnesic silicate like Na-TSM, led to the formation of high surface area solids exceptionally under mild acid-treatment conditions [23,24], Na-TSM having much larger particle size didn't alter into high surface area solids under the mild acid-leaching. These facts indicate that the acid-treatment of APM-500 has an advantage over that of the non-pillared clay minerals including Na-TSM because modification of pore properties can be achieved under milder conditions.…”

Section: Methodsmentioning

confidence: 99%

“…Acid-treatment of various clay minerals, such as kaolinite [13,14], phlogopite [15,16], vermiculite [17], montmorillonite [18,19], fluorohectorite [15], talc [20,21], chlorite [22], saponite [23,24], has been reported. The acid-treated products typically show micro-or mesopores, depending on the starting clay mineral species and the acid-treatment conditions.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of novel porous solids from alumina-pillared fluorine micas by acid-treatment

Yamaguchi

Yoshimura

Yamakami

et al. 2008

Microporous and Mesoporous Materials

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New porous solids from alumina-pillared fluorine micas (APMs), which were obtained from synthetic Na-tetrasilicic fluorine mica [NaMg 2.5 Si 4 O 10 F 2 ], were prepared by sulfuric acid-treatment under mild conditions at 25˚C. The products were investigated by XRD, ICP, SEM, TEM and N 2 adsorption-desorption isotherm at 77 K. XRD measurements indicated that the interlayer pillared structure having a large basal spacing collapsed during the early stages of the acid-treatment. ICP analyses indicated that Al 3+ and Mg 2+ ions were leached out from the pillared micas during the acid-treatment. The pore properties of the leached products were found to differ from those of the mother pillared micas: the acid leaching of the pillared micas leads to the formation of mesopores around 3.2 nm in diameter. The correlation between the change in pore properties and cation elution behavior suggests that the mesopore formation results from the leaching of Mg 2+ ions from the octahedral sheet of the pillared micas. The leached products thus obtained retained the flaky morphology of the mother pillared micas. These results show that the mild acid-treatment using APMs provides a novel route for obtaining unique mesopore solids having the large particle sizes of the mother micas.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of novel porous solids from alumina-pillared fluorine micas by acid-treatment

Yamaguchi

Yoshimura

Yamakami

et al. 2008

Microporous and Mesoporous Materials

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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: 99%

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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“…Specific surface area of raw saponite collected from different deposits determined using nitrogen adsorption ranged from 30 to 70 m 2 g −1 [5,18,22]. A considerably higher BET specific surface area of 202 m 2 g −1 was determined for a raw sample of saponite from Vicalvaro (Spain) [13].…”

mentioning

confidence: 98%

Structural, Mineral and Elemental Composition Features of Iron-Rich Saponite Clay from Tashkiv Deposit (Ukraine)

Sokol¹,

Sprynskyy

Ganzyuk

et al. 2019

Colloids and Interfaces

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Low-temperature nitrogen adsorption–desorption isotherms, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, as well as infrared spectroscopy were used to characterize structural features of raw and acid-treated saponite from Tashkiv deposit of Ukraine. It was determined that raw saponite is predominantly composed of trioctahedral saponite with an admixture of dioctahedral nontronite and associated minerals such as quartz, hematite, and anatase. Raw saponite clay was characterized by a high content of iron (19.3%) and titanium (1.1%). Iron is present in the form of hematite particles, isomorphic replacements in octahedral and tetrahedral sheets of a clay structure, or as a charge-balancing cation in the interlayer space. Titanium is homogeneously dispersed as submicrometer anatase particles. The porous structure of both saponite forms consists of micro-meso porous system with narrow slit mesopores dominating. As a consequence of the acid treatment, the specific surface area increased from 47 to 189 m2 g−1, the total pore volume from 0.134 to 0.201 cm3 g−1, and the volume of the micropores increased sevenfold. Using the data of our research allowed us to utilize these mineral resources wisely and to process saponite more efficiently.

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Cited by 37 publications

References 22 publications

Preparation of novel porous solids from alumina-pillared fluorine micas by acid-treatment

Preparation of novel porous solids from alumina-pillared fluorine micas by acid-treatment

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

Structural, Mineral and Elemental Composition Features of Iron-Rich Saponite Clay from Tashkiv Deposit (Ukraine)

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