Beta Iron Silicate Catalyst for NOx Reduction
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Solution Overview
Problem
There is no known composition that effectively compounds β-type iron silicate with a porous inorganic oxide to enhance catalytic functions, particularly for reducing nitrogen oxides, and existing solutions do not offer high performance across a wide range of temperatures.
Innovation Solution
A composition is developed by combining β-type iron silicate with a porous inorganic oxide, utilizing ammonia as a reducing agent, which exhibits synergistic effects in nitrogen oxide reduction, maintaining high activity from low to high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a β-type iron silicate is compounded with a porous inorganic oxide, then the nitrogen oxide reduction capability is enhanced across a wide temperature range, but the device complexity increases due to the multi-component composition
Solution Approach 1:
The patent applies composite materials by combining β-type iron silicate with porous inorganic oxide to create a catalyst composition that leverages the complementary properties of both materials. The β-type iron silicate provides low-temperature reduction activity while the porous inorganic oxide contributes solid acidic function and high-temperature stability, achieving enhanced nitrogen oxide reduction across a wide temperature range.
Solution Approach 2:
The patent applies local quality by assigning different functional roles to different components of the composite: the β-type iron silicate is positioned to provide low-temperature reduction activity, while the porous inorganic oxide is positioned to provide solid acidic function and structural support. This functional differentiation allows each component to optimize its performance in its designated role.
2Reliability
If the β-type iron silicate is used with low silica-alumina ratio, then the low temperature activity is improved, but the hydrothermal stability deteriorates
Solution Approach 1:
The patent merges the β-type iron silicate with porous inorganic oxide to create a composite system where the low silica-alumina ratio β-type iron silicate provides high low-temperature activity while the porous inorganic oxide provides hydrothermal stability. This combination allows both contradictory requirements to be satisfied simultaneously through the synergistic interaction of the two materials.
Solution Approach 2:
The patent applies parameter changes by optimizing the silica-alumina ratio of the β-type iron silicate to be low (enhancing low-temperature activity) while simultaneously introducing porous inorganic oxide with appropriate pore structure and acidic properties. This parameter optimization strategy allows the system to achieve high low-temperature activity while maintaining hydrothermal stability through the stabilizing effect of the porous inorganic oxide.
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 composition demonstrates enhanced nitrogen oxide reduction capabilities across a wide temperature range, offering a high-performance catalyst with improved freedom in design and efficiency.
Implementation Method 1
a β-type iron silicate, which contains all or part of iron in a β-type framework structure, with a porous inorganic oxide having a solid acidic function
Implementation Method 2
a porous inorganic oxide having a solid acidic function
Data Source
AI summary
The present invention relates to a composition including a β-type iron silicate, which includes all or part of iron in a β-type framework structure, and a solid acidic porous inorganic oxide. The present invention is characterized in that the β-type iron silicate is compounded with the porous inorganic oxide having solid acidic properties so that the solid acidic function derived from aluminum of the β-type iron silicate, is reinforced or complemented by the porous inorganic oxide, the individual particles of which are physically isolated from each other. It is preferred that the fluorine content relative to the dry weight of the β-type iron silicate is 400 ppm or less and the crystal particles of the β-type iron silicate have a truncated square bipyramidal morphology. According to the present invention, a composition that is useful as a high-performance catalyst, adsorbent, or the like, can be provided.