Obtención y caracterización de la fase vaterita metaestable del carbonato de calcio catalizada por Ag-Mg a temperatura ambiente | Obtaining And Characterization Of The Metastable Vaterite Phase Of Calcium Carbonate Catalyzed by Ag-Mg at room temperature

Loisangela Álvarez, Edgar Márquez, Euclides Velasco

Resumen


RESUMEN

Fue realizada la cristalización de CaCO3, mediante el método de difusión de gas, con CaCl2 y (NH4)2CO3 como fuentes de iones Ca2+ y CO32-, respectivamente, y promovida por un catalizador de HDL Ag-Mg a temperatura ambiente. Por difracción de rayos X, se comprueba que la reacción catalizada promovió la formación de los polimorfos del CaCO3 calcita y vaterita, este último con un porcentaje oscilando el 20% en los casos de variación de las concentraciones de iones Ca2+ y CO32- o variando el catalizador. Por Microscopia Electrónica de Barrido fue comprobada las morfologías romboedral para la calcita y de arreglo esférico de capas para la vaterita. La mayor cantidad de vaterita se obtuvo empleando 5 mmol de CaCl2, 21,1 mmol de (NH4)2CO3 y 0,1 g del catalizador.

PALABRAS CLAVE: CaCO3, polimorfo, catalizador Mg-Ag, calcita, vaterita.

ABSTRACT

The crystallization of CaCO3 was performed with CaCl2 and (NH4)2CO3 as sources of Ca2+ and CO32- ions, respectively, and promoted by a catalyst of Ag-Mg LDH at room temperature. It was demonstrated by X-ray diffraction that the catalyzed reaction promoted the formation of polymorphs of CaCO3 calcite and vaterite, the latter with a percentage ranging 20% in the cases of variation of the concentration of Ca2+ and CO32- ions or varying of catalyst. By Scanning Electronic Microscopy it was tested out the morphologies, rombohedral for calcite and spherical arrangement of layers for vaterite. The highest amount of vaterite was obtained using 5 mmol of CaCl2, 21.1 mmol of (NH4)2CO3 and 0.1 g of the catalyst.

KEY WORDS: CaCO3, polymorph, Ag-Mg catalyst, calcite, vaterite.


Referencias


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