Solid-State Cu Ion Exchange in CHA Zeolite Production
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Solution Overview
Problem
Conventional methods for producing zeolite with a CHA structure and carried Cu ions face inefficiencies in ion exchange, leading to Cu wastage and increased production costs due to precipitation and the need for solution adjustments.
Innovation Solution
A method involving mixing zeolite powder with a Cu salt powder and heating the mixture, utilizing solid-state ion exchange to enhance Cu ion exchange efficiency, reduce waste, and lower production costs, with specific conditions including a moisture content of 30% or less and a heating temperature of 250 to 800°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If ion exchange is performed using a solution containing Cu ions, then Cu can be carried on the zeolite, but a lot of Cu remains in the solution and is wasted
Solution Approach 1:
The invention changes the physical state parameter of the Cu source from liquid solution to solid powder form. This parameter change enables complete utilization of Cu ions during ion exchange, eliminating Cu loss in solution while maintaining high ion exchange efficiency. The solid Cu salt powder gradually releases Cu ions to the zeolite during heating, ensuring complete transfer without waste.
Solution Approach 2:
The invention extracts the Cu ions from the liquid solution medium and applies them directly in solid powder form to the zeolite. This extraction of Cu from the solution phase eliminates the problem of Cu remaining in solution, as the solid-state ion exchange process ensures complete transfer of Cu to the zeolite structure.
2Ease of manufacture
If solution-based ion exchange is used, then Cu can be carried on the zeolite, but the solution requires adjustment and treatment which increases complexity
Solution Approach 1:
The invention removes the liquid solution component entirely from the ion exchange process, extracting only the essential Cu ions in solid powder form. This eliminates all solution handling, adjustment, and treatment steps, dramatically simplifying the manufacturing process while reducing equipment and operational complexity.
Solution Approach 2:
The invention replaces the liquid-phase chemical process with a solid-state thermal process. Instead of using solution-based ion exchange requiring pH adjustment and filtration equipment, the process uses simple heating of solid powder mixture, substituting complex liquid handling with simple thermal treatment.
3Manufacturing precision
If Cu concentration or pH of solution is adjusted during ion exchange, then Cu can be carried on the zeolite, but the process requires multiple adjustments and impurity removal
Solution Approach 1:
The invention extracts Cu from solution-based delivery systems and applies it directly as solid powder. This eliminates the need for pH adjustment and concentration control steps, as solid-state ion exchange naturally controls Cu loading through stoichiometry and heating conditions without requiring complex process adjustments.
Solution Approach 2:
The invention replaces complex solution chemistry control (pH adjustment, concentration monitoring, impurity removal) with simple solid-state thermal processing. The heating process inherently controls the ion exchange rate and completion, eliminating multiple process adjustment steps while maintaining precise Cu loading control.
4Productivity
If solid-state ion exchange with Cu salt powder is used, then ion exchange efficiency increases and Cu utilization improves, but heating is required
Solution Approach 1:
The invention changes the temperature parameter from ambient (solution-based) to elevated (solid-state). The heating energy input activates the solid-state ion exchange process, enabling complete Cu transfer to zeolite with high efficiency. The energy investment in heating is offset by the elimination of Cu waste and solution handling requirements.
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 method significantly increases Cu ion exchange efficiency, ensures effective utilization, and reduces production costs by eliminating the need for solution handling and maintaining the zeolite's crystal structure.
Implementation Method 1
the almost total amount of Cu used in the zeolite can be carried by solid-state ion change using a powder of Cu salt rather than the ion exchange in the solution containing Cu ions
Implementation Method 2
a heating step of heating the obtained powder mixture. When the heating temperature is 250° C. or higher, Cu can be efficiently carried on the zeolite. In addition, when the heating temperature is 800° C. or lower, the crystal structure of the zeolite is hardly destroyed.
Data Source
AI summary
There is provided a method for producing zeolite having a CHA structure in which Cu is carried, the method enabling an increase in ion exchange efficiency of Cu, effective utilization of Cu, and reduction in production cost. The method for producing the zeolite having the CHA structure in which Cu is carried includes a mixing step of mixing a powder of the zeolite having the CHA structure and a powder of Cu salt with each other and a heating step of heating the obtained powder mixture.