Catalyst for Organic Acid Exhaust Gas Decomposition
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Solution Overview
Problem
Conventional catalysts for decomposing organic acids in exhaust gases, such as acetic acid, suffer from reduced activity over time due to non-uniform distribution of noble metal components, leading to aggregation and decreased efficiency.
Innovation Solution
A catalyst comprising a refractory inorganic oxide layer supported on a three-dimensional structure with catalyst components like Ce, W, or their complex oxides, and noble metals like Pt, Pd, Rh, or Au, uniformly distributed throughout the layer to prevent aggregation and maintain activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalysts with noble metals supported on alumina are used, then initial catalytic activity is achieved, but activity decreases over time due to aggregation of noble metal components
Solution Approach 1:
The patent applies local quality by creating a non-uniform distribution of noble metal components within the catalyst layer. The noble metals are concentrated in specific regions (such as near the surface or in specific zones) rather than being uniformly distributed throughout the entire catalyst layer. This localized concentration prevents aggregation by maintaining optimal spacing between noble metal particles in critical active regions, thereby maintaining catalytic activity stability over extended service life.
Solution Approach 2:
The patent employs parameter changes by modifying the distribution pattern, concentration gradients, and spatial arrangement of noble metal components within the catalyst layer. By controlling these parameters during catalyst preparation, the noble metals are positioned to maximize catalytic activity while minimizing aggregation tendencies, thus extending the catalyst's effective service life and maintaining reliability over time.
2Reliability
If noble metal components are uniformly distributed in the catalyst layer, then aggregation is prevented, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes porous materials, specifically a porous alumina support structure, to achieve uniform distribution of noble metal components. The porous structure provides a high surface area with controlled pore sizes and distributions that naturally facilitate uniform dispersion of noble metal particles throughout the catalyst layer. This approach prevents aggregation while avoiding the need for complex manufacturing processes, as the porous structure itself guides the uniform distribution during catalyst preparation.
3Ease of manufacture
If conventional catalyst preparation methods are used, then manufacturing simplicity is maintained, but noble metal aggregation occurs reducing efficiency
Solution Approach 1:
The patent applies preliminary action by pre-preparing a porous alumina support structure with optimized pore distribution and surface characteristics before introducing the noble metal components. This preliminary preparation of the support structure creates a framework that naturally guides uniform noble metal distribution during subsequent impregnation or deposition steps. This approach maintains manufacturing simplicity while preventing aggregation, thereby preserving high decomposition efficiency of organic acids in exhaust gases.
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 catalyst achieves high efficiency and durability in decomposing organic acids over a long period with improved catalytic activity and reduced aggregation of noble metals.
Implementation Method 1
a catalyst having a noble metal such as platinum supported on a carrier such as alumina
Implementation Method 2
A catalyst comprising a refractory inorganic oxide layer supported on a three-dimensional structure with catalyst components like Ce, W, or their complex oxides, and noble metals like Pt, Pd, Rh, or Au, uniformly distributed throughout the layer to prevent aggregation and maintain activity
Implementation Method 3
a catalyst for oxidation treating unburnt hydrocarbons in an exhaust gas containing an excess amount of oxygen
Data Source
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AI summary
The present invention provides a catalyst for treating an organic acid-containing exhaust gas, which can remove by decomposing an organic acid such as acetic acid in an exhaust gas over a long period in high removal efficiency, and a method for treating an organic acid-containing exhaust gas using such a catalyst. The present invention is to provide a catalyst for treating an organic acid-containing exhaust gas, which comprises at least one catalyst component (A) selected from the group consisting of metals selected from the group consisting of La, Ce, Pr and W, an oxide of the metal, and a complex oxide of the metals; and at least one noble metal component (B) selected from the group consisting of Pt, Pd, Rh, Ru, Ir and Au.