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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
Published on: February 23, 2016
Mesoporous titanosilicates with high loading of titanium synthesized in mild acidic buffer solution
Jianting Tang1, Jian Liu, Jie Yang
1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Journal of Colloid and Interface Science
|April 28, 2009
Summary
Synthesizing mesoporous titanosilicates with high titanium content is achievable using a mild acidic co-condensation method. This approach yields highly ordered structures, even with elevated titanium levels, utilizing specific silicon sources and block copolymer templates.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Mesoporous titanosilicates are advanced materials with applications in catalysis and separation.
- Achieving high titanium content while maintaining structural integrity is a key challenge in their synthesis.
Purpose of the Study:
- To develop a synthesis method for mesoporous titanosilicates with high titanium content.
- To investigate the influence of different silicon sources and reaction conditions on the material's structure and titanium incorporation.
Main Methods:
- Co-condensation of acetylacetone-modified titanium isopropoxide and various silicon sources (TMOS, TEOS, EGMS) using Pluronic P123 template.
- Mild acidic synthesis conditions (pH 4.4) with a sodium silicate and EGMS mixture as the preferred silicon source.
- Characterization using XRD, N(2) sorption, TEM, UV-vis diffuse reflectance, and UV resonance Raman spectroscopy.
Main Results:
- Highly regular mesoporous titanosilicate structures were obtained with Ti/Si molar ratios as high as 0.059.
- Framework titanium species were predominant at Ti/Si ratios below 0.042.
- The combination of sodium silicate and EGMS proved optimal for synthesizing ordered mesoporous titanosilicates with high titanium content.
Conclusions:
- A mild acidic synthesis route effectively produces mesoporous titanosilicates with high titanium content and ordered structures.
- The choice of silicon source significantly impacts the resulting material's properties.
- The method's efficiency is linked to the controlled hydrolysis-condensation rates and precursor hydrophilicity in the mild acidic environment.
