COMPOSITE ZEOLITES SYNTHESIZED FROM (TEA)2O-Na2O- Al2O3-SiO2-H2O SYSTEM : STRUCTURAL CHARACTERISTICS AND HYDRATION ACTIVITY

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Abstract
Several catalysts of composite zeolites were synthesized from (TEA) 2O-Na2O-Al2O3-SiO2-H2O system adopting different conditions of the preparation. The prepared zeolites, in the hydrogen-exchanged form were characterized by EDS and XRD. The obtained catalysts consisted of ß-zeolite composited with different amounts of other zeolites such as morderute and/or analcime. Acidic properties of these composite zeolites were measured potentiometrically in an aqueous medium. The hydration of butene-1 over the H-exchanged composite zeolites was carried out at 250°C and 180 atm, and with a water/olefin ratio of 3.86. The hydration activity was discussed in terms of structural characteristics and acidic properties of the prepared catalysts.