Synthesis and Characterization of bimodal mesoporous materials Ti-UVM-7 by direct incorporation into the starting gel.
Síntesis y caracterización de materiales mesoporosos bimodales Ti-UVM-7 por incorporación directa en el gel de partida
Abstract
In this work, it was studied the synthesis of bimodal mesoporous solids Ti-UVM-7, using the synthesis strategy known as the atrane way, with incorporation of Ti into synthesis gel in Si/Ti molar ratios of 10, 25, 50 and 100. The characterizations used were: X-ray diffraction, N2 adsorption-desorption isotherms, transmission electron microscopy and X-ray energy dispersive. For all solids, X-ray patterns showed peaks around 2.02 degrees of 2θ, isotherms were type IV, with two volume steps at relative pressures of 0.4 and 0.9, typical of UVM-7 materials, and BET surface areas of 1216 to 128 m2/g, decreasing as the content of Ti increased (decrease of the Si / Ti molar ratio). The amount of Ti incorporated was too similar to that initial placed in the synthesis gel, except for the solid with a Si/Ti molar ratio of 100 (initial), which only reached Si / Ti = 127.
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