Synthesis and Characterization of Mesoporous Pseudoboehmite by a Route Mineral and Its Transformation into Alumina- y
Current Advances in Chemistry and Biochemistry Vol. 6,
28 May 2021
,
Page 80-88
https://doi.org/10.9734/bpi/cacb/v6/7078D
Abstract
The synthesis of a mesoporous pseudoboehmite without the use of organic agents is defined in this study. Precipitation at pH=7 and at atmospheric pressure of a temperature solution of 60°C, alkaline melting of a bauxite, gave a mesoporous pseudoboehmite with a specific surface area of 317 m2/g. As a precipitating agent, hydrochloric acid (HCl) is used. In comparison, applying the same treatment to the same solution but at a lower temperature of 25°C resulted in an amorphous gel with a low specific surface. As a result, the temperature of the synthesis solution has a big impact on the textural properties of the finished product, particularly the volume and pore diameter. As a result, compared to pseudoboehmite, the amorphous gel has a lower pore volume and a larger average pore diameter. Furthermore, using this simple process, the pseudoboehmite was transformed into a nano spinel lattice alumina-y with a precise surface area of 272 m2/g. The topotactic properties of pseudoboehmite were almost preserved in the textural analysis of alumina. To characterise the synthesised materials, EDX, XRD, FTIR, SEM, and BET were used as analytical methods. The nitrogen isotherms and pore size distribution curves confirm that the products made at 25°C or 60°C with alumina-y are mesoporous materials with flat particles.
- Pseudoboehmite
- Mesoporous
- Alkaline fusion
- Precipitation
- Alumina-y
- Specific surface