Characterization of natural Brazilian clays and their utilization as catalysts in the coiodination of alkenes with water and alcohols

Villegas, Raul Alberto Sodré; Santo, José Luiz do Espírito; Mattos, Marcio C. S. de; Aguiar, Mônica Lopes; Guarino, Alcides Wagner Serpa

doi:10.1590/s0103-50532005000400012

Cited by 22 publications

(2 citation statements)

References 3 publications

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“…This can be attributed to the fact that in the first case the specimen under test is in dry state, and then the inter-layer of the clays gets suppressed [45][46][47]. SS BET values are consistent with other observations made on mixed-layer clay minerals [48][49][50]. Both specific surface values (SS BET and SS EGME ) of the mudstones were high and similar to the values expected for natural bentonites, which indicates that the influence of smectite prevails over the other clay minerals.…”

Section: Physicochemical Propertiessupporting

confidence: 87%

Potential use of calcareous mudstones in low hydraulic conductivity earthen barriers for environmental applications

Musso

Francisca

Parolo

et al. 2013

Environmental Technology

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Earthen layers play a significant role in isolating contaminants in the subsurface, controlling the migration of contaminant plumes, and as landfill liners and covers. The physical, chemical and mineralogical properties of three calcareous mudstones from the Jagüel and Roca formations in North Patagonia, Argentina, are evaluated to determine their potential for the construction of liners. These mudstones were deposited in a marine environment in the Upper Cretaceous-Paleocene. The tested specimens mainly comprise silt and clay-sized particles, and their mineralogy is dominated by a smectite/illite mixed layer (70-90% Sm) and calcite in smaller proportion. Powdered mudstone samples have little viscosity and swelling potential when suspended in water. The hydraulic conductivity of compacted mudstones and sand-mudstone mixtures is very low (around 1-3 x 10(-10) m/s) and in good agreement with the expected hydraulic behaviour of compacted earthen layers. This behaviour can be attributed to the large amount of fine particles, high specific surface and the close packing of particles as confirmed by scanning electron microscope analysis. The tested materials also show a high cation exchange capacity (50-70 cmol/kg), indicating a high contaminant retardation capability. The calcareous mudstones show satisfactory mineralogical and chemical properties as well as an adequate hydraulic behaviour, demonstrating the potential use of these materials for the construction of compacted liners for the containment of leachate or as covers in landfills. These findings confirm the potential usage of marine calcareous mudstones as a low-cost geomaterial in environmental engineering projects.

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Section: Physicochemical Propertiessupporting

confidence: 87%

Potential use of calcareous mudstones in low hydraulic conductivity earthen barriers for environmental applications

Musso

Francisca

Parolo

et al. 2013

Environmental Technology

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“…12 Among of them, it can catalyze the addition of thio-compounds to alkenes. 13 The reaction of (R)-limonene with S-thioacetic acid (1 mol equiv.)…”

Section: Resultsmentioning

confidence: 99%

The reaction of (R)-limonene with S-thioacids

Mattos¹,

Bernini²

2007

J. Braz. Chem. Soc.

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A reação do (R)-limoneno com uma quantidade equimolar de ácidos S-tioacético ou Stiobenzóico em tolueno sob refluxo ocorre com regiosseletividade anti-Markovnikoff produzindo os 9-[(4R, 8RS)-p-mentenil] S-tiocarboxilatos em 71 e 61% de rendimento, respectivamente. A mesma reação do ácido S-tioacético catalisada pela argila montmorilonita K-10 levou ao Stioéster em 65% de rendimento, além de p-mentadienos e p-cimeno. Foi observado que a argila K-10 promove a isomerização do limoneno aos mentadienos, e sua disproporcionação para o pcimeno The reaction of (R)-limonene with equimolar amount of S-thioacetic or S-thiobenzoic acids in refluxing toluene proceeded regioselectively in anti-Markovnikoff fashion forming 9-[(4R, 8RS)-p-menthenyl] S-thiocarboxylates (71 and 61% yield, respectively). The montmorillonite K-10 clay-catalyzed reaction of (R)-limonene with S-thioacetic acid led to the S-thioester (65%) along with p-menthadienes and p-cymene. It was observed that K-10 clay promoted the isomerization of limonene to p-menthadienes and further disproportionation to p-cymene.

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Coiodination of styrene with commercial clays: a convenient preparation of styrene oxide

2008

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Characterization of natural Brazilian clays and their utilization as catalysts in the coiodination of alkenes with water and alcohols

Cited by 22 publications

References 3 publications

Potential use of calcareous mudstones in low hydraulic conductivity earthen barriers for environmental applications

Potential use of calcareous mudstones in low hydraulic conductivity earthen barriers for environmental applications

The reaction of (R)-limonene with S-thioacids

Coiodination of styrene with commercial clays: a convenient preparation of styrene oxide

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