Influence of Preparation Conditions on Structural Stability of Ordered Mesoporous Carbons Synthesized by Evaporation-induced Triconstituent Co-assembly Method |
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Authors: | Bo You Jun Yang Guo-ping Yong Shao-min Liu Wei Xie Qing-de Su |
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Institution: | 1.Department of Chemistry, University of Science and Technology of China, Hefei 230026, China2.Technology Center, China Tobacco Fujian Industrial Corporation, Xiamen 361000, China |
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Abstract: | Various ordered mesoporous carbons (OMCs) have been prepared by evaporation-induced triconstituent co-assembly method. Their mesostructural stability under different carbon content, aging time and acidity were conveniently monitored by X-ray diffraction, transmis-sion electron microscopy, and N2 sorption isotherms techniques. The results show mesostruc-tural stability of OMCs is enhanced as the carbon content increases from 36% to 46%, further increasing carbon content deteriorates the mesostructural stability. Increasing aging time from 0.5 h to 5.0 h make the mesostructural stability go through an optimum (2.0 h) and gradually reduce framework shrinkage of the OMCs. Highly OMCs can only be obtained in the acidity range of 0.2~1.2 mol/L HCl, when the acidity is near the isoelectric point of silica, the resulting OMCs have the best mesostructure stability. Under the optimum condi-tion, the carbon content of 46%, aging time of 2.0 h, and 0.2 mol/L HCl, the resulting OMCs have the best mesostructure stability and the highest BET surface areas of 2281 m2/g. |
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Keywords: | Triblock copolymer Mesostructural stability Self-assembly Ordered meso-porous carbon |
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