纳米孔硅铝层柱蒙脱石复合材料的制备和性能研究

周春晖; 李庆伟; 葛忠华; 李小年; 郭红强

纳米孔硅铝层柱蒙脱石复合材料的制备和性能研究

浙江工业大学化工与材料学院催化新材料研究室, 杭州 310014

基金项目: 国家自然科学基金项目(29706011);浙江省自然科学基金项目(201057)

详细信息

通讯作者:
周春晖,博士,主要从事粘土矿物化学和催化新材料研究 E-mail: catalysis8@yahoo.com.cn

中图分类号: TB232; O643
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出版历程
- 收稿日期: 2002-11-11
- 修回日期: 2003-02-19
- 刊出日期: 2004-02-14

STUDY ON PREPARATION AND PROPERTIES OF NANOPOROUS SILICA/ALUMINA PILLARED MONTMORILLONITE COMPOSITES

Laboratory of Advanced Catalytic Materials, College of Chemical Engineering and Materials Science Zhejiang University of Technology, Hangzhou 310014, China

摘要

摘要: 以蒙脱石为原料、十六烷基三甲基溴化铵和十二烷胺为结构导向剂,直接利用正硅酸乙酯和异丙醇铝混合物为层柱前驱体,合成了新型纳米孔径硅铝层柱蒙脱石复合材料。运用XRD、TG、FT-IR和N₂等温吸附-脱附等技术表征复合材料。结果表明:合成材料具有大通道(层间距为3.45 nm)、孔径较大且分布窄(平均孔径为2.0 nm)、高比表面积(S_BET=502.0 m²/g)和高热稳定性(大于750 ℃)。和硅层柱多孔粘土复合材料相比,铝的掺入对孔结构和热稳定性影响较小,但明显提高了酸性和酸强度。
- 复合材料 /
- 纳孔粘土 /
- 蒙脱石 /
- 合成 /
- 催化
Abstract: The nanoporous silica/alumina pillared montmorillonite composites were synthesized by direct hydrolysis of inorganic aluminum and silicon precursor in the gallery of layered hosts through an intragallery-templated method. Powder X-ray diffraction, TG, FT-IR and N₂ adsorption-desorption isotherms were used to characterize the synthetic Si/Al-clay composite, which was here designated SA-PMH. The results reveal that the SA-PMH exhibits basal spacing of 3.45 nm, a large BET specific area of 502.0 m²/g , an average pore size 2.0 nm and a high thermal stability up to 750 ℃. In comparison to the silica-PMH, little change in textural porosity and thermal stability was observed, but the SA-PMH has more surface acidity and medium-strong acid sites, as confirmed by the temperature-programmed desorption of ammonia and acid-catalyzed reactivity of catechol alkylation with tert-butyl alcohol.
- composites /
- nanoporous clays /
- montmorillonite /
- synthesis /
- catalysis