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3.45nm)、孔径较大且分布窄(平均孔径为2.0nm)、高比表面积(SBET=502.0m2/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。
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°C. 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.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2004年第1期17-22,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金项目(29706011)
浙江省自然科学基金项目(201057)
关键词
复合材料
纳孔粘土
蒙脱石
合成
催化
Acidity
Adsorption isotherms
Alcohols
Alkylation
Aluminum
Ammonia
Catalysis
Clay
Composite materials
Desorption
Hydrolysis
Silica
Synthesis (chemical)
Thermodynamic stability
Thermogravimetric analysis
X ray diffraction analysis