Síntesis de Zeolitas tipo Cancrinita de Sulfato mediante la reacción Redox Permanganato-Tiosulfato
Synthesis of Sulphate Cancrinite-type Zeolite by the Redox Permanganate-Thiosulfate ions reaction
DOI:
https://doi.org/10.15446/rev.fac.cienc.v8n2.78901Keywords:
Cancrinita, permanganato, reacciones redox, tiosulfato. (es)Cancrinite, permanganate, reaction redox, thiosulfate. (en)
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Se estudió la influencia de la composición aniónica en la reacción redox permanganato-tiosulfato en la síntesis de la zeolita tipo cancrinita de sulfato, utilizando diferentes concentraciones de NaOH: 8, 12 y 16 M, y diferentes relaciones en peso KMnO4/(Na2S2O3+KMnO4) comprendidos entre 0 y 100%. La síntesis se realizó a partir de zeolita X, presión autógena y 80 ºC por 240 h. Los sólidos fueron caracterizados mediante las técnicas de difracción de rayos X (DRX), espectroscopia infrarrojo con transformada de Fourier (FT-IR) y análisis elemental por EDX. Los resultados mostraron, independientemente de la concentración de la base: que con un 100% de KMnO4, se generó la cancrinita de manganato. Con un 0, 25 y 50 % p/p en KMnO4 en el gel de reacción, se forma la cancrinita de tiosulfato. Para un 75% p/p en KMnO4 se obtuvo la cancrinita de sulfato producto de la reacción redox entre el permanganato y el tiosulfato. En base a los resultados obtenidos, se puede concluir que ocurrió una reacción redox para las composiciones aniónicas 25, 50, 75 y 100% en KMnO4. El orden de poder moldeante en la formación de la zeolita tipo cancrinita es: S2O32- >SO42- >>MnO4-
The influence of the anionic composition in the redox permanganate-thiosulfate ions reaction in the synthesis of suphate cancrinite-type zeolite was studied, using different concentrations of NaOH: 8, 12 and 16 M, and different KMnO4/Na2S2O3 ratios between 0 and 100 w/w %. The synthesis was carried out from zeolite X, 80 ° C and autogenous pressure for 240 h. Solids obtained were characterized by: X-ray diffraction (XRD), infrared spectroscopy with Fourier transform (FT-IR) and elemental analysis by EDX. Results showed that manganate cancrinite was produced at permanganate ion 100 w/w% and for all base concentrations. At 0, 25 and 50 w/w% KMnO4 and all NaOH concentrations, the thiosulphate cancrinite. For 75 w/w% KMnO4 and all NaOH concentrations, the sulphate cancrinite is produced by the redox thiosulfate-permanganate anions reaction. Based in obtained results, it can be concluded that a redox reaction at: 25, 50, 75 and 100 w/w % in KMnO4 has occurred. The template power to the synthesis of cancrinite-type zeolites is S2O32- >SO42- >>MnO4- .
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