Synthesis and characterization of mesoporous Si-modified alumina with high thermal stability
| Autor: | Xinmei Liu, Zifeng Yan, Yanyan Xu, Yang Yang, Benjing Xu, Baozhai Han, Youhe Wang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Aqueous solution
Silicon Sodium aluminate technology industry and agriculture chemistry.chemical_element Sodium silicate 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Crystallinity chemistry Chemical engineering Mechanics of Materials Organic chemistry General Materials Science Thermal stability Fourier transform infrared spectroscopy 0210 nano-technology Mesoporous material |
| Zdroj: | Microporous and Mesoporous Materials. 238:84-89 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/j.micromeso.2016.02.031 |
| Popis: | Mesoporous alumina with pseudo-boehmite phase modified by water glass was prepared by using the cation-anion double hydrolysis method from mixed aqueous solution of aluminum sulfate and sodium aluminate. The texture structure and acidity of these samples was studied with the assistance of characterization techniques, such as X-ray diffraction (XRD), N-2 adsorption-desorption isotherms, Al-27 and Si-29 magic-angle spinning nuclear magnetic resonance (MAS NMR) and Fourier transform infrared (FTIR) spectroscopy. The XRD and N-2 adsorption-desorption results show that the addition of sodium silicate can decrease the crystallinity of alumina, but greatly improve pore volume and surface area. The highest pore volume (1.46 cm(3)/g) and surface area (427.69 m(2)/g) can be simultaneously obtained when the adding amount of silica is up to 12 wt%. The NMR and FTIR results display that the presence of a certain amount of silicon can generate Al-V in alumina, which is considered to be related with strong acid sites. In addition, the acidity of the Si-modified alumina samples can be adjusted by changing the amount of silica. (C) 2016 Elsevier Inc. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect