| 前驱体凝胶中催化剂含量对碳化硅结构和性能的影响 |
| Influences of Catalyst Amount in Xerogels Precursors on the Structure and Property of Silicon Carbide |
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| 摘要: 以糠醇为碳源，正硅酸乙酯为硅源，硝酸钴为催化剂，含氢硅油为结构助剂，通过溶胶凝胶和碳热还原的方法制备出高比表面积多孔碳化硅，采用XRD、SEM、TEM、HRTEM和低温氮吸附-脱附对所制备的样品进行表征。结果表明，催化剂用量对碳化硅的堆积缺陷密度、平均晶粒度、比表面积及孔容有重要的影响，多孔碳化硅的比表面积在49~167 m2·g-1范围内变化。 |
| 关键词: 高比表面积碳化硅 溶胶凝胶 碳热还原 硝酸钴 |
| 基金项目: |
| Abstract: High surface area silicon carbide was prepared by the sol-gel and carbothermal reduction method, in which furfuryl alcohol and tetraethoxysilane(TEOS) were respectively employed as carbon and silica precursors, cobalt nitrate as the catalyst and polymethylhydrosiloxane(PMHS) as pore-adjusting agent. XRD、SEM、TEM、HRTEM and low temperature adsorption-desorption were used to characterize the SiC samples. The results show that the samples are porous silicon carbide with surface area ranging from 49 to 167 m2·g-1, and the amount of the catalyst has important influences on the stacking fault density, average crystallite size, surface area, and pore volume of the SiC products. |
| Keywords: high surface area silicon carbide Sol-gel carbothermal reduction cobalt nitrate |
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| 王冬华,靳国强,郭向云.前驱体凝胶中催化剂含量对碳化硅结构和性能的影响[J].无机化学学报,2009,25(5):794-798. |
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