Effect of synthesis time and treatment on porosity of mesoporous silica materials |
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Authors: | Asli Ertan Pradeep Kodumuri Orhan Talu Surendra N Tewari |
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Institution: | (1) Department of Chemical and Biomedical Engineering, Cleveland State University, Cleveland, OH 44115, USA |
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Abstract: | Nitrogen adsorption at 77 K on mesoporous silica materials (MPS) with varying synthesis time and treatment conditions was
investigated. Scanning electron microscope (SEM) and X-ray diffraction (XRD) were also used to characterize the mesoporous
materials. This study was performed at 6, 24 and 72-h synthesis times. It is shown that 6-h is not enough for complete formation
of the MPS material and at least 24-h is necessary. The pore structure starts decaying for the 72-h synthesis time. The three-after-synthesis
treatment conditions used were 1) washed, 2) washed and calcined and 3) directly calcined after synthesis. Ethanol/HCl mixtures
were used for washing and calcinations were performed at 550°C. Among these samples, directly washed sample yields the lowest
adsorption capacity while washed and calcined sample yields the highest adsorption capacity. Hence, it is concluded that washing
stabilizes the structure before high temperature treatment. |
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Keywords: | Mesoporous silica synthesis Nitrogen adsorption Treatment Synthesis time |
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