One-Pot Synthesis of Copper Small-Pore Zeolites
Solution Overview
Problem
Current processes for manufacturing copper-containing small-pore zeolites are energy-intensive, require multiple steps, and rely on expensive organic templates, limiting flexibility in Si/Al ratio and copper content.
Innovation Solution
A one-step synthesis process using a reaction mixture of faujasite zeolites, Cu-tetraethylenepentamine (Cu-TEPA), and alkaline hydroxides like lithium, sodium, or potassium hydroxides, which eliminates the need for expensive templates and reduces energy consumption, allowing for controlled copper content and Si/Al ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional multi-step synthesis processes are used to manufacture copper-containing small-pore zeolites, then copper content and framework type can be controlled, but the process requires multiple steps, high energy consumption, and expensive organic templates
Solution Approach 1:
The patent combines multiple process steps into a single one-pot synthesis reaction. The alkaline hydroxide treatment and copper incorporation occur simultaneously during zeolite crystallization, eliminating separate ion exchange or impregnation steps. This merging reduces process complexity while maintaining control over copper content and framework type through the basicity of the hydroxide used.
Solution Approach 2:
The patent uses the basicity parameter of different alkaline hydroxides (LiOH, NaOH, KOH, RbOH, CsOH) to control both the framework type formed and the copper content incorporated. By changing the cation parameter of the hydroxide, the process simultaneously determines the zeolite structure and copper loading, reducing the need for multiple adjustment steps.
2Reliability
If conventional synthesis processes are used, then copper-containing zeolites can be produced, but energy consumption is high due to multiple processing steps
Solution Approach 1:
The patent merges crystallization, copper incorporation, and framework formation into a single hydrothermal treatment step. This eliminates multiple heating and cooling cycles required in conventional processes, reducing cumulative energy consumption while maintaining reliable zeolite production through controlled basicity-dependent pathways.
Solution Approach 2:
The one-pot synthesis maintains continuous useful action by having copper incorporation occur simultaneously with zeolite crystallization rather than in separate batch operations. The alkaline environment continuously facilitates both framework formation and copper uptake throughout the hydrothermal treatment, maximizing energy efficiency.
3Manufacturing precision
If expensive organic templates are used as structure directing agents, then specific framework types can be obtained, but the process becomes costly and less flexible
Solution Approach 1:
The patent replaces expensive organic templates with inexpensive inorganic alkaline hydroxides (LiOH, NaOH, KOH, RbOH, CsOH) as structure-directing agents. These hydroxides are cheap, water-soluble, and fully soluble during the process, eliminating the need for costly organic compounds while maintaining precise control over framework type through basicity-dependent crystallization pathways.
Solution Approach 2:
The patent uses the cation parameter of alkaline hydroxides to control framework type formation. Different cations (Li+, Na+, K+, Rb+, Cs+) promote different zeolite structures through their specific ionic radii and coordination preferences, providing template-free control over framework type while using inexpensive inorganic materials.
4Manufacturing precision
If conventional processes with fixed templates are used, then specific framework types are obtained, but flexibility in Si/Al ratio is limited
Solution Approach 1:
The patent uses the basicity parameter of alkaline hydroxides to simultaneously control framework type and Si/Al ratio. The cation size and charge density of different hydroxides influence both the zeolite structure formed and the aluminum incorporation during crystallization, providing coupled control over framework type and composition flexibility without fixed template constraints.
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 process efficiently produces copper-containing small-pore zeolites with desired CuO content between 1 and 10 wt.% and various framework types, such as CHA, ABW, and ANA, with reduced energy consumption and flexibility in Si/Al ratios, avoiding the use of expensive organic templates.
Implementation Method 1
heating the reaction mixture to form a copper containing small-pore zeolite
Implementation Method 2
treating a zeolite of the faujasite framework type with a reaction mixture of copper complex with tetraethylenepentamine and at least one alkaline hydroxide
Implementation Method 3
copper complex with tetraethylenepentamine
Implementation Method 4
Copper introduction needs to be performed by an additional unit operation such as ion exchange, impregnation and the like
Implementation Method 5
heating the reaction mixture to form a copper containing small-pore zeolite
Data Source
AI summary
The present invention relates to a process for the manufacture of a copper containing small-pore zeolite which comprises⋅preparing a reaction mixture comprising a zeolite of the faujasite framework type, Cu-tetraethylenepentamine (Cu-TEPA) and at least one compound M(OH)x, which does not comprise the tetraethylammonium cation and⋅heating the reaction mixture to form a copper containing small-pore zeolite.