Room temperature synthesis of Si-MCM-41 using polymeric version of ethyl silicate as a source of silica |
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Authors: | TR Gaydhankar |
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Affiliation: | Catalysis Division, National Chemical Laboratory, Pune 411008, India |
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Abstract: | Synthesis of mesoporous MCM-41 materials at room temperature using less expensive polymeric version of ethyl silicate (40 wt% SiO2) as a source of silica was established. The influence of crucial synthesis parameters such as molar ratios of H2O/NH4OH, NH4OH/SiO2 and CTMABr/SiO2 in gel on the quality of the phase formed was investigated. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and low temperature N2 adsorption-desorption isotherms have been employed to characterize the products. The magnitude of orderness, textural properties and thermal stability of the Si-MCM-41 samples prepared under identical judiciously pre-controlled synthesis conditions using ethyl silicate and conventional tetraethyl orthosilicate (TEOS) were assessed. Even though, ethyl silicate has proved to be suitable source for the preparation of MCM-41 at room temperature, there exists an optimum value of H2O/NH4OH for different NH4OH/SiO2 molar ratios in the gel. Changes in the morphology were observed when NH4OH/SiO2, H2O/NH4OH molar ratios in the gels were changed. |
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Keywords: | A Structural materials B Chemical synthesis C X-ray diffraction D Surface properties |
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