ETS-10 Synthesis Using Titanium Oxide Hydrosol
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Solution Overview
Problem
Conventional synthesis methods for ETS-10 titanosilicate molecular sieves face challenges with unstable titanium sources, poor repeatability, and the presence of stray crystals due to the properties of titanium sources like TiCl3, TiCl4, TiOSO4, and TiO2, which affect the purity and crystallinity of the product.
Innovation Solution
The method involves using titanium oxide hydrosol as a titanium source, which is more stable and easily dispersible, allowing for the synthesis of ETS-10 titanosilicate molecular sieves by mixing titanium oxide hydrosol with a silicon source, sodium hydroxide, a fluorine-containing mineralizer, and water, and adjusting the pH before hydrothermal crystallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional titanium sources (TiCl3, TiCl4, TiOSO4, TiO2) are used for synthesis, then the synthesis process can be carried out, but the product purity and crystallinity deteriorate due to stray crystal formation and poor repeatability
Solution Approach 1:
The patent changes the chemical state of titanium from solid or gaseous forms to a colloidal sol form, which fundamentally alters the reactivity and dispersion characteristics. This parameter change enables uniform distribution of titanium species throughout the gel matrix, preventing localized precipitation and stray crystal formation, thereby improving both product purity and synthesis repeatability
Solution Approach 2:
The titanium sol acts as an intermediary form between conventional titanium sources and the final molecular sieve structure. This intermediate colloidal state provides controlled reactivity and uniform nucleation, eliminating the harmful effects of direct precipitation from solid or gaseous titanium sources while maintaining the desired crystallization process
2Productivity
If trivalent titanium sources (TiCl3) are used, then synthesis can proceed, but synthesis efficiency deteriorates due to indirect hydrolysis requirements and operational complexity increases
Solution Approach 1:
The patent extracts the problematic hydrolysis step from the synthesis pathway by using tetravalent titanium sources that do not require indirect hydrolysis conversion. This eliminates the need for complex operational controls and intermediate conversion steps, directly improving synthesis efficiency and reducing operational complexity
Solution Approach 2:
The titanium sol is prepared in advance with controlled hydrolysis characteristics, so that when mixed with the gel precursors, the titanium species are already in the appropriate state for direct incorporation into the molecular sieve structure. This preliminary preparation eliminates subsequent complex processing steps
3Manufacturing precision
If nanoscale TiO2 (P25) is used as titanium source, then synthesis effect is improved, but cost increases making it unsuitable for industrial application
Solution Approach 1:
The patent replaces expensive nanoscale TiO2 with a cost-effective titanium sol that can be prepared from conventional titanium sources. The sol provides comparable or superior performance to nanoscale TiO2 while being significantly cheaper and suitable for large-scale industrial production
Solution Approach 2:
The invention creates a composite colloidal system where titanium oxide species are dispersed in a liquid medium with controlled rheological and chemical properties. This composite form combines the advantages of nanoscale dispersion with the cost benefits of conventional titanium sources, achieving both high synthesis effect and cost-effectiveness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in high-purity, high-crystallinity ETS-10 titanosilicate molecular sieves with improved synthesis efficiency and reduced stray crystal formation, simplifying the operational process.
Implementation Method 1
mixing a titanium oxide hydrosol, a silicon source, a sodium hydroxide, a fluorine-containing mineralizer and a water to give a gel
Implementation Method 2
hydrothermal crystallizing the gel at 170 to 250° C. for 10 to 100 hours to obtain the ETS-10 titanosilicate molecular sieve
Data Source
AI summary
The present invention relates to a synthesis method for ETS-10 titanosilicate molecular sieves. The method comprises the steps of mixing a titanium oxide hydrosol, a silicon source, a sodium hydroxide, a fluorine-containing mineralizer and a water to give a gel and adjusting the pH thereof to 10.4 to 10.8; and hydrothermal crystallizing the gel at 170 to 250° C. for 10 to 100 hours to obtain the ETS-10 titanosilicate molecular sieves. In the synthesis method for ETS-10 titanosilicate molecular sieves provided by the present invention, a titanium oxide hydrosol is used as the titanium source to synthesize the ETS-10 titanosilicate molecular sieves, and the problem that conventional soluble titanium salt-based titanium sources tend to hydrolyze and the problem of poor dispersibility for the titanium source system of insoluble titanium oxide are therefore prevented. The ETS-10 titanosilicate molecular sieves synthesized has high purity and high crystallinity.