在无外加酸体系中改变晶化温度合成AlSBAˉ15介孔材料,并以此为刚性模板,蔗糖为碳源,合成出一系列具有不同孔结构的有序介孔炭材料CMKˉ3,系统考察晶化温度对AlSBAˉ15和其反相复制结构CMKˉ3孔道结构的影响。结果显示在无外加酸合成体系中改变晶化温度可对AlSBAˉ15的孔道结构进行有效调控,通过结构复制技术可制备出具有不同结构的CMKˉ3。控制刚性模板AlSBAˉ15的晶化温度为90益,所得介孔炭材料CMKˉ3(CMKˉ3(90))结构最佳,除介孔排列高度有序外,还具有高比表面积(1688 m2·g-1)和大孔容(0.95 cm3·g-1)。另外,对CMKˉ3的微孔性质与刚性模板孔壁中的次级介孔结构的内在联系进行研究,发现调变刚性模板的晶化温度可以有效改善有序介孔炭材料CMKˉ3的结构性质。
Highly ordered mesoporous carbons ( OMCs) designated CMKˉ3 were synthesized using mesoporous AlˉSBAˉ15 with different textural properties as hard templates and sucrose as a carbon source. AlˉSBAˉ15 is an ordered mesoporous aluminaˉsilica synthesized with a soft template, P123. The effect of the aging temperature for the hard templates on the pore structure of CMKˉ3 was investigated. Xˉray diffraction, N2 adsorption and transmission electron microscopy were used to characterize the pore structures of the hard templates and the resultant CMKˉ3. Result indicates that CMKˉ3 with different pore structures can be obtained by tailorˉ ing the pore structures of the hard templates bysimply controlling the aging temperature in an acidˉfree medium. The best CMKˉ3 possessed a highlyˉordered pore structure, and a very high BET surface area (1 688 m2 ·g-1 ) and pore volume (0. 95 cm3 ·g-1 ) when the hard template was aged at 90 ℃. The microporous character of the CMKˉ3 was related to the thickness of the mesopore wall of the hard templates. The textural characteristics of the resultant CMKˉ3 can be improved by simply adjusting the aging temˉ perature in the synthesis of the hard templates to control their mesopore structure.
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