Titanium MFI Zeolite Synthesis to Limit TiO2 Formation
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Solution Overview
Problem
Existing titanium zeolite catalysts for propylene oxide production suffer from reduced selectivity due to the presence of titanium dioxide as an extra-framework component, which acts as a photosensitizer, leading to inefficient epoxidation reactions.
Innovation Solution
The development of a zeolitic material with a framework structure comprising Si, O, and Ti, using a Ti-containing compound with an APHA color number ≤ 300, which minimizes the formation of titanium dioxide, thereby enhancing catalytic performance and selectivity in epoxidation reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If common preparation methods are used to synthesize TS-1, then the synthesis process is simple and fast, but titanium dioxide forms as an extra-framework component which reduces catalytic selectivity
Solution Approach 1:
The patent changes the pH parameter of the synthesis gel to alkaline conditions (pH 9-14) and uses specific Ti-containing compounds with controlled hydrolysis rates. This modifies the synthesis parameters to prevent titanium dioxide formation while maintaining framework titanium incorporation, thereby improving catalytic selectivity without significantly reducing synthesis productivity
Solution Approach 2:
The patent introduces organic Ti-containing compounds (such as Ti(O-alkyl)4) as intermediary precursors that control the hydrolysis and condensation process. These intermediaries prevent direct precipitation of titanium dioxide and facilitate controlled incorporation of titanium into the zeolite framework, resolving the contradiction between synthesis speed and catalytic selectivity
2Reliability
If Ti containing compounds with high color number are used, then the synthesis process is less selective, but titanium dioxide formation is reduced
Solution Approach 1:
The patent specifies using Ti-containing compounds with APHA color number ≤ 300, which indicates controlled purity and composition. This parameter change ensures the Ti compound has appropriate hydrolysis characteristics that promote framework incorporation while minimizing titanium dioxide formation, addressing both framework Ti incorporation and harmful byproduct formation
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
The new zeolitic material achieves higher selectivity and stability in propylene oxide production, maintaining efficiency even at extended runtimes by reducing the formation of titanium dioxide, thus optimizing the epoxidation process.
Implementation Method 1
a slow hydrolysis of the Ti containing species is indicated
Implementation Method 2
an epoxidation catalyst comprising a titanium zeolite
Data Source
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AI summary
The present invention relates to a zeolitic material of MFI framework type having a framework structure comprising Si, O, and Ti, obtained or obtainable from a Ti containing compound, wherein the Ti containing compound has an APHA color number of ≤ 300, the APHA color number being determined according to DIN EN ISO 6271:2016-05; wherein the Ti containing compound comprises a Ti containing alcoholate selected from the group of Ti(O-alkyl)4, wherein each alkyl group is independently selected from branched or unbranched C1 to C6 alkyl. The present invention also relates to a process for preparation of said zeolitic material, a molding comprising said zeolitic material, the use of said molding and a process for oxidizing an organic compound comprising bringing an organic compound in contact with a catalyst comprising a molding..