Synthesis and characterization of silica doped alumina catalyst support with superior thermal stability and unique pore properties
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- 作者：Maryam Khosravi Mardkhe ; Baiyu Huang ; Calvin H. Bartholomew…
- 关键词：Silica ; doped alumina ; Thermally stable ; Large pore size ; High surface area
- 刊名：Journal of Porous Materials
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：23
- 期：2
- 页码：475-487
- 全文大小：2,977 KB
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Baiyu Huang (1)
Calvin H. Bartholomew (2)
Todd M. Alam (3)
Brian F. Woodfield (1)
1. Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
2. Department of Chemical Engineering, Brigham Young University, Provo, UT, 84602, USA
3. Department of Electronic, Optical and Nanostructured Materials, Sandia National Laboratories, Albuquerque, NM, 87185, USA - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Catalysis
Characterization and Evaluation Materials
Physical Chemistry - 出版者：Springer Netherlands
- ISSN：1573-4854
文摘
A facile, solvent-deficient, one-pot synthesis of a thermally stable silica-doped alumina, having high surface area, large pore volume and uniquely large pores, has been developed. Silica-doped alumina (SDA) was synthesized by adding 5 wt% silica from tetraethyl orthosilicate (TEOS) to aluminum isoproxide (AIP), a 1:5 mol ratio AIP to water, and a 1:2 mol ratio TEOS to water in the absence of a template. The structure of silica-doped alumina was studied by in situ high-temperature powder XRD, nitrogen adsorption, thermogravimetric analysis, solid-state NMR, and TEM. The addition of silica significantly increases the stability of γ-Al2O3 phase to 1200 °C while maintaining a high surface area, a large pore volume and a large pore diameter. After calcination at 1100 °C for 2 h, a surface area of 160 m2/g, pore volume of 0.99 cm3/g, and a bimodal pore size distribution of 23 and 52 nm are observed. Compared to a commercial silica-doped alumina, after calcination for 24 h at 1100 °C, the surface area, pore volume, and pore diameter SDA are higher by 46, 155, and 94 %, respectively. Results reveal that Si stabilizes the porous structure of γ-Al2O3 up to 1200 °C, while unstabilized alumina is stable to only 900 °C. From our data, we infer that Si enters tetrahedral vacancies in the defect spinel structure of alumina without moving Al from tetrahedral positions and forms a silica–alumina interface.