Using natural Na montmorillonite as the host clay, porous silica-pillared montmorillonites (Si-PILC) were prepared by the template synthesis method. Furthermore, the texture and structure of such composite materials w...Using natural Na montmorillonite as the host clay, porous silica-pillared montmorillonites (Si-PILC) were prepared by the template synthesis method. Furthermore, the texture and structure of such composite materials were investigated by using modern several physicochemical techniques such as powder X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Fourier Transformation Infra-red Spectra (FT-IR), and N2 adsorption/desorption measurements. The results reveal that tetrathylorthosilicate (TEOS) agent has been successfully intercalated into the montmorillonite and the characteristic d001 spacing of Si-PILC increases from 1.28nm to 3.15nm. The resultant products with large gallery height possess BJH pore volume as large as 0.30cm^3/g, remarkably high BET specific surface area of over 592.0m^2/g, pore size distribution in the mesopore region 3.3nm^4.3nm after thermal treatment at 800℃.展开更多
以河南某地的钠基蒙脱土为原料,用模板剂前驱法合成了一类新型的多孔Si层柱蒙脱土材料(Si-MMT).通过粉末X射线衍射(XRD)、N2吸附-脱附分析、程序升温氨脱附(NH3-TPD)2、7Al和29Si的魔角旋转核磁共振(29Si MAS NMR和27Al MAS NMR)、吡啶...以河南某地的钠基蒙脱土为原料,用模板剂前驱法合成了一类新型的多孔Si层柱蒙脱土材料(Si-MMT).通过粉末X射线衍射(XRD)、N2吸附-脱附分析、程序升温氨脱附(NH3-TPD)2、7Al和29Si的魔角旋转核磁共振(29Si MAS NMR和27Al MAS NMR)、吡啶吸附红外光谱法、水热老化法等测试手段,研究了材料水热稳定性和酸性.结果表明:Si-MMT的水热稳定性可维持在600℃,比表面积和比孔容分别为523 m2/g和0.29 cm3/g;与原土相比,Si-MMT层柱蒙脱土多孔材料的总酸量增加了将近1倍;合成材料同时存在B酸和L酸,L酸主要来源于层柱,B酸则主要来源于焙烧过程有机物分解释放质子和黏土中四面体存在Al的同晶取代Si.展开更多
文摘Using natural Na montmorillonite as the host clay, porous silica-pillared montmorillonites (Si-PILC) were prepared by the template synthesis method. Furthermore, the texture and structure of such composite materials were investigated by using modern several physicochemical techniques such as powder X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Fourier Transformation Infra-red Spectra (FT-IR), and N2 adsorption/desorption measurements. The results reveal that tetrathylorthosilicate (TEOS) agent has been successfully intercalated into the montmorillonite and the characteristic d001 spacing of Si-PILC increases from 1.28nm to 3.15nm. The resultant products with large gallery height possess BJH pore volume as large as 0.30cm^3/g, remarkably high BET specific surface area of over 592.0m^2/g, pore size distribution in the mesopore region 3.3nm^4.3nm after thermal treatment at 800℃.
文摘以河南某地的钠基蒙脱土为原料,用模板剂前驱法合成了一类新型的多孔Si层柱蒙脱土材料(Si-MMT).通过粉末X射线衍射(XRD)、N2吸附-脱附分析、程序升温氨脱附(NH3-TPD)2、7Al和29Si的魔角旋转核磁共振(29Si MAS NMR和27Al MAS NMR)、吡啶吸附红外光谱法、水热老化法等测试手段,研究了材料水热稳定性和酸性.结果表明:Si-MMT的水热稳定性可维持在600℃,比表面积和比孔容分别为523 m2/g和0.29 cm3/g;与原土相比,Si-MMT层柱蒙脱土多孔材料的总酸量增加了将近1倍;合成材料同时存在B酸和L酸,L酸主要来源于层柱,B酸则主要来源于焙烧过程有机物分解释放质子和黏土中四面体存在Al的同晶取代Si.
