Synthesis and Characterization of Metal Mixed Oxides from Layered Double Hydroxides

Bálsamo, Nancy; Mendieta, Silvia Nazaret; Oliva, Marcos Iván; Eimer, Griselda A.; Crivello, Mónica E.

doi:10.1016/j.mspro.2012.06.068

Cited by 26 publications

(19 citation statements)

References 19 publications

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“…The synthesis procedure consisted of a number of steps, including homogenisation of the starting mixture, calcination, rinsing, milling and drying. The amounts of the starting materials taken for the procedure are given in Table I (Balsamo et al, 2012):…”

Section: Pigment Preparation Proceduresmentioning

confidence: 99%

Investigation of the anticorossion properties of perovskites in epoxy-ester resin based organic coating materials

Kalendová

Hejdová

Vesely

2015

Anti-Corrosion Methods and Materials

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Purpose -The purpose of this paper is to synthesize anticorrosion pigments of the perovskite type, YXO 3 , where X ϭ Ti, Zr, Mn or Al and Y ϭ Ca, Sr, La or Fe, for coating materials intended for corrosion protection of metals. Also, to synthesize pigments containing hexavalent Mo and W (double perovskites). Design/methodology/approach -The anticorrosion pigments were synthesized from oxides or carbonates by a high-temperature process. The following pigments were synthesized: CaTiO . The pigments were characterized by the physico-chemical properties of the powders, by X-ray diffraction analysis and by scanning electron microscopy. Epoxy-ester coating materials containing the pigments at a volume concentration PVC ϭ 10 per cent were prepared and subjected to tests examining their physico-mechanical properties and tests in simulated corrosion atmospheres. Findings -The perovskite structure was identified in the majority of the pigments. The pigments were found to impart good corrosion inhibiting properties to coating materials. The highest calculated anticorrosion efficiency was found for paints containing CaMnO 3 or SrMnO 3 as the pigments. Practical implications -The pigments synthesized can be used with advantage in paints intended for corrosion protection of the substrate metals. Originality/value -The use of the above pigments in anticorrosion coating materials to protect metals is new. Especially beneficial are the uses and procedures for the synthesis of anticorrosion pigments which do not contain heavy metals and are acceptable from the environmental protection aspect.

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Section: Pigment Preparation Proceduresmentioning

confidence: 99%

Investigation of the anticorossion properties of perovskites in epoxy-ester resin based organic coating materials

Kalendová

Hejdová

Vesely

2015

Anti-Corrosion Methods and Materials

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“…However, the most suitable network was a two-layer structure with 35 neurons in the sigmoidal hidden layer and a linear neuron in the output layer. In addition, the impact produced by different numbers of neurons (5,15,35 and 60) in the hidden layer was analysed for the selected ANN. It was found that the best accuracy was related to the 3-35-1 final model.…”

Section: Discussionmentioning

confidence: 99%

“…They improve the longterm stability of food emulsions and facilitate the displacement of protein from oil surfaces [3]. The transesterification reaction can be catalysed by solid bases such as mixed oxides derived from layered double hydroxides (LDH) modified with metal ions [4,5].…”

Section: Introductionmentioning

confidence: 99%

r Comparison of Neural Networks. An Estimation Model in Yield of Monoglycerides from Biodiesel by-Product

Álvarez¹,

Bálsamo²,

Modesti³

et al. 2019

JESTR

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Biodiesel is generally manufactured by transesterification, obtaining glycerol as a by-product. The transesterification of methyl stearate selectively produced monoglycerides, for glycerol valuation. Mixed oxides containing lithium catalysed the reaction. The purpose of this work was to develop and compare mathematical models obtained through artificial neural networks (ANN), capable for characterising the relationship between the mole percent conversion of methyl stearate and the yield of the products mono-, di-and triglycerides. The lowest mean squared error (MSE), the highest correlation coefficient (R), similarity in the evolution of validation and simulation errors and absence of data overlearning were considered to select the best model. Three ANNs with backpropagation structures were compared. They evidenced high correspondence between the estimated product yield values and the interpolated experimental ones. The ANN containing 35 neurons with sigmoid transfer function in the hidden layer and a linear neuron in the output one was the simplest. Consequently, the 5, 15 and 60 neurons were also explored in the hidden layer. The ANN structured with an intermediate number of neurons (35) achieved the most adequate MSE, considering mono-and diglyceride products (0.011193, 0.000489). The development of these models contributes to the dynamic estimation of the process.

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“…Após a calcinação, o material foi macerado e armazenado. 13 Os espectros na região do infravermelho do catalisador foram registrados entre 4000 e 400 cm -1 em um espectrofotômetro de absorção molecular na região do infravermelho com transformada de Fourier Perkin Elmer (FTIR), a partir de pastilhas contendo uma mistura da amostra com KBr, na concentração de 1 % m/m. A resolução utilizada foi de 4 cm -1 e os espectros foram obtidos com 16 varreduras.…”

Section: Preparo E Caracterização Do Catalisador K 2 O:al 2 Ounclassified

Synthetic and Reusable Potassium Aluminate Heterogeneous Catalyst for Biodiesel Production

Santos¹,

Cestari²

2014

Revista Virtual De Química

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The objective of this work was the synthesis of a heterogeneous catalyst (K 2 O:Al 2 O 3 mixed oxide), for use in biodiesel production through refined soybean oil transesterification. The catalyst was analyzed by FTIR and by basic sites titration. In the transesterification reaction it was used 17.5 % w/w of catalyst compared to soybean oil, molar ratio methanol:oil equal to 9.4:1, with 6 hours of reaction time at 60 °C and 250 rpm. The obtained biodiesel showed specific gravity at 20 °C of 881.53 kg/m 3 , ester content above 96.5 % w/w (correlated to specific mass) and water content of 236.73 mg/kg. It was possible to perform a reaction and 3 recycles with the catalyst without catalytic activity apparent loss.

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Synthesis and Characterization of Metal Mixed Oxides from Layered Double Hydroxides

Cited by 26 publications

References 19 publications

Investigation of the anticorossion properties of perovskites in epoxy-ester resin based organic coating materials

Investigation of the anticorossion properties of perovskites in epoxy-ester resin based organic coating materials

r Comparison of Neural Networks. An Estimation Model in Yield of Monoglycerides from Biodiesel by-Product

Synthetic and Reusable Potassium Aluminate Heterogeneous Catalyst for Biodiesel Production

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