CHA Zeolite Composition for Broad-Temperature NOx Conversion
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Solution Overview
Problem
Existing zeolitic materials with framework type CHA, such as copper and potassium or cesium, are not optimized for high nitrogen oxide conversion efficiency across a broad temperature range in industrial applications.
Innovation Solution
A novel zeolitic material comprising copper, sodium, and one or more of potassium and cesium, with specific weight percentages and molar ratios, is developed to enhance catalytic performance for nitrogen oxide conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing zeolitic materials with framework type CHA containing copper and single alkali metal (potassium or cesium) are used, then the catalyst structure is simple and easy to manufacture, but the nitrogen oxide conversion efficiency is insufficient and the active temperature range is narrow
Solution Approach 1:
The patent combines multiple alkali metals (potassium and/or cesium) with copper in a single zeolitic material formulation. This merging of different metallic components creates synergistic effects that enhance nitrogen oxide conversion efficiency beyond what single-metal catalysts achieve, while maintaining a unified catalyst structure rather than requiring multiple separate catalysts
Solution Approach 2:
The invention creates a composite zeolitic material containing copper ions and multiple alkali metals (K and/or Cs) within the CHA framework structure. This composite approach integrates different metallic phases with specific weight ratios (Cu: 2-7.5%, K: 0.05-5%, Cs: 0.05-5%) to achieve superior catalytic performance that neither component could provide alone
2Adaptability or versatility
If existing zeolitic materials are used, then the manufacturing process is simple, but the catalytic activity over a broad temperature range is limited
Solution Approach 1:
The patent optimizes specific compositional parameters including the weight percentages of copper (2-7.5%), potassium (0.05-5%), and cesium (0.05-5%), along with the Si/Al molar ratio (2-20) in the zeolitic framework. These parameter adjustments enable the catalyst to maintain high activity across an expanded temperature range, adapting to varying operating conditions while following established synthesis procedures
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 novel zeolitic material exhibits high activity and efficient nitrogen oxide conversion over a broad temperature range, making it suitable for industrial applications.
Implementation Method 1
The zeolitic material used as catalyst or catalyst component allows for a very good conversion of nitrogen oxides wherein a high activity over a broad temperature range was also observed
Data Source
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AI summary
A zeolitic material having framework type CHA, comprising a transition metal M and an alkali metal A, and having a framework structure comprising a tetravalent element Y, a trivalent element X and O, wherein the transition metal M is a transition metal of groups 7 to 12 of the periodic table, A is one or more of K and Cs, Y is one or more of Si, Ge, Ti, Sn and Zr, and X is one or more of Al, B, Ga and In.A process for preparing such a zeolitic material. Use of such a zeolitic material.