CIT-13 Germanosilicate Extra-Large Pore Zeolite Synthesis
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Solution Overview
Problem
Current zeolite materials lack large pores capable of handling larger feed molecules in oil upgrade applications, limiting their catalytic efficiency and selectivity.
Innovation Solution
Development of a new crystalline germanosilicate phase, CIT-13, with a three-dimensional framework featuring 10- and 14-membered rings, synthesized using organic structure-directing agents (OSDAs) like substituted benzyl-imidazolium compounds, which provides larger pore dimensions and improved catalytic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional zeolite materials are used, then catalytic properties are maintained, but pore size remains too small to handle larger feed molecules
Solution Approach 1:
The patent changes the fundamental parameters of the zeolite structure by incorporating germanium into the silica framework and using specific organic structure-directing agents (OSDAs) with varied aromatic ring substitutions. This alters the pore dimensions from conventional sizes to extra-large pores with 10- and 14-membered rings, enabling accommodation of larger feed molecules while maintaining catalytic functionality
Solution Approach 2:
The invention transitions from conventional two-dimensional pore systems to a three-dimensional framework with interconnected extra-large pores. The CIT-13 topology creates a novel dimensional architecture with pores defined by 10- and 14-membered rings in three dimensions, providing enhanced accessibility and capacity for large molecule catalysis
2Volume of moving object
If new crystalline phases are discovered to increase pore size, then handling of larger molecules improves, but material complexity and synthesis difficulty increase
Solution Approach 1:
The patent employs organic structure-directing agents (OSDAs) as intermediaries during synthesis. These OSDAs, featuring specific aromatic ring substitutions, act as templates that guide the formation of the desired CIT-13 framework structure with extra-large pores. The OSDAs mediate the complex self-assembly process, making the synthesis of this novel phase more controllable and reproducible
Solution Approach 2:
The invention optimizes synthesis parameters including the type and substitution pattern of OSDAs, gel composition ratios, temperature, and pressure conditions. By systematically adjusting these parameters, the patent achieves reproducible synthesis of the CIT-13 phase with consistent extra-large pore structures, balancing complexity with manufacturability
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
CIT-13 exhibits enhanced catalytic performance and selectivity due to its unique pore structure, enabling the handling of larger molecules and improving catalytic processes in industrial applications such as oil upgrading and emission reduction.
Implementation Method 1
The disclosure also describes methods of preparing these crystalline compositions using organic structure-directing agents (OSDAs)
Implementation Method 2
CIT-13 exhibits enhanced catalytic performance and selectivity due to its unique pore structure, enabling the handling of larger molecules and improving catalytic processes in industrial applications such as oil upgrading
Data Source
AI summary
The present disclosure is directed to the use of novel crystalline germanosilicate compositions in affecting a range of organic transformations. In particular, the crystalline germanosilicate compositions are extra-large-pore compositions, designated CIT-13 possessing 10- and 14-membered rings.