Publicación: CATALYTIC OXIDATION OF 2-(METHYLTHIO)-BENZOTHIAZOLE ON ALKALINE EARTH TITANATES, ATIO(3) (A = CA, SR, 13A)
Fecha
2017
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Resumen
THE EFFECT OF THE NATURE OF THE A-CATION IN ALKALINE EARTH TITANATES, ATIO3 (A = CA, SR, BA), AND THE CALCINATION TEMPERATURE (600 °C, 700 °C) ON THE CATALYTIC PERFORMANCE FOR THE OXIDATION OF 2-(METHYLTHIO)-BENZOTHIAZOLE IS REPORTED. THE SOLIDS WERE CHARACTERIZED BY NITROGEN ADSORPTION ISOTHERMS, POWDER X-RAY DIFFRACTION, O2 TEMPERATURE-PROGRAMMED DESORPTION, TEMPERATURE-PROGRAMMED REDUCTION, FOURIER TRANSFORM INFRARED SPECTROSCOPY, AND DIFFUSE REFLECTANCE SPECTROSCOPY/UV?VIS TECHNIQUES. A LARGER EXTENT OF THE PEROVSKITE-TYPE STRUCTURE WAS OBTAINED FOR THE ALKALINE EARTH TITANATES AT A CALCINATION TEMPERATURE OF 700 °C. THE INCREASES IN THE CATALYTIC OXIDATION WITH THE IONIC RATIO OF THE A-CATION (BATIO3 > SRTIO3 > CATIO3) WAS ATTRIBUTED TO THE WELL-DEFINED PEROVSKITE STRUCTURE WITH A LOWER EXTENT OF SEGREGATED PHASES. FOR THE CATALYSTS CALCINED AT 700 °C, A LARGER CONVERSION LEVEL (>75 MOL%) AND SELECTIVITY TOWARDS THE CORRESPONDING SULFONE (>95 MOL%) WAS ACHIEVED AT A REACTION TEMPERATURE OF 60 °C USING H2O2 (30%) AS AN OXIDANT. BATIO3 CALCINED AT 700 °C, PROVIDED THE BETTER CATALYTIC PERFORMANCE AND NO ACTIVITY LOSS AFTER FOUR REUSES, INDICATIVE OF THE LARGEST STABILITY IN THE REACTION MEDIUM.
