کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9617608 49169 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of ZrO2-SiO2 mesocomposite with high ZrO2 content via a novel sol-gel method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Synthesis of ZrO2-SiO2 mesocomposite with high ZrO2 content via a novel sol-gel method
چکیده انگلیسی
A novel, convenient, one step sol-gel technique using sodium silicate and carbonate complex of zirconium in basic medium leads to the synthesis of mesostructured zirconia-silica composite with narrow pore size distribution having moderately high surface area (360-500 m2/g). These materials were characterized by powder low angle X-ray diffraction (XRD), N2 sorption isotherms, HRTEM, 29Si-MAS NMR, and FTIR. The surface acidity of the composites has been analyzed through FTIR spectra of pyridine-adsorbed compounds. Nitrogen adsorption data, HRTEM and XRD patterns confirmed that, the structure, high surface area, and uniform pore size distribution are maintained in the synthesized composites with Si/Zr ratio of 2 to 0.5. Further increase in silica loading showed the reduction of surface area. EDX analyses show that this novel sol-gel technique efficiently avoids the leaching of zirconium and silica from the framework of the material. The calcined ZrO2-SiO2 mesocomposite show worm-like pores in the microstructure and have both Brönsted and Lewis acid sites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 84, Issues 1–3, 15 September 2005, Pages 223-228
نویسندگان
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