Amorphous Metal Alloy Oxidation Catalyst for Exhaust Purification
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Solution Overview
Problem
Existing exhaust gas purification systems using noble metals like platinum and rhodium are costly and inefficient due to high fabrication costs and degradation when exposed to high temperatures, leading to reduced purification efficiency and reliability.
Innovation Solution
An oxidation catalyst formed from an amorphous metal alloy powder, comprising elements such as Fe, Ni, Mn, Co, Zr, and Pt, with specific atomic ratios and surface roughness, is applied to an exhaust gas purification filter, prepared through a process involving melting, rapid cooling, and powdering, followed by oxidation, to enhance purification efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noble metals (Pt, Rh) are used as catalyst coating, then catalytic activity and stability are improved, but fabrication cost increases rapidly
Solution Approach 1:
The patent replaces expensive noble metals (Pt, Rh) with cheaper amorphous metal alloy powders containing Fe, Ni, Mn, Co, Zr, and other non-noble metals. This substitution dramatically reduces fabrication cost while maintaining adequate catalytic performance for exhaust gas purification.
Solution Approach 2:
The patent uses composite amorphous metal alloy powders containing multiple elements (Fe, Ni, Mn, Co, Zr, B, Y, Ti, P, Pd, Be, Si, C, Ag, Na, Mg, Ga, Al) in specific ratios. This composite approach creates a catalyst that combines the benefits of various metals to achieve both cost-effectiveness and catalytic activity.
2Reliability
If Pt catalyst is used, then reactivity is improved, but particle growth and shedding occur at high temperatures, reducing purification efficiency
Solution Approach 1:
The patent changes the physical and chemical parameters of the catalyst by using amorphous metal alloy powders with specific compositional ratios and controlling particle size (0.1-10 μm). The amorphous structure and controlled particle dimensions prevent particle growth and shedding at high temperatures, maintaining purification efficiency over time.
Solution Approach 2:
Instead of using conventional crystalline noble metal catalysts that tend to sinter and shed particles at high temperatures, the patent inverts the approach by using amorphous non-noble metal alloys. The amorphous structure inherently resists particle growth and shedding, solving the stability problem of conventional catalysts.
3Productivity
If conventional catalyst coating is applied, then CO conversion is achieved, but harmful NO2 is produced as by-product
Solution Approach 1:
The patent optimizes the local composition and structure of the catalyst particles. By controlling the elemental composition (Fe, Ni, Mn, Co, Zr, B, Y, Ti, P, Pd, Be, Si, C, Ag, Na, Mg, Ga, Al in specific ratios) and amorphous structure, the catalyst achieves selective CO oxidation to CO2 while suppressing the formation of harmful NO2 by-products.
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 amorphous metal alloy catalyst significantly reduces manufacturing costs, improves exhaust gas purification efficiency, and maintains durability even at high temperatures, enhancing the reliability of exhaust gas purifiers by converting CO to CO2 with high efficiency and avoiding NO2 production.
Implementation Method 1
Through this reaction, carbon monoxide or hydrocarbons are converted into carbon dioxide or water
Implementation Method 2
oxidation catalyst able to be prepared at low cost since the composition thereof includes an amorphous metal alloy powder
Data Source
AI summary
The present invention relates to an oxidation catalyst, a method for preparing the same, and a filter for exhaust gas purification comprising the same and, more specifically, to an oxidation catalyst, a method for preparing the same, and a filter for exhaust gas purification comprising the same, the oxidation catalyst being formed by comprising an amorphous metal alloy powder, thereby being preparable at a low cost, being capable of enhancing purification efficiency for exhaust gas when applied to the filter for exhaust gas purification, and being capable of deriving reliability enhancement for operation of an exhaust gas purifier having the filter for exhaust gas purification mounted therein. To this end, the present invention provides an oxidation catalyst, a method for preparing the same, and a filter for exhaust gas purification comprising the same, the oxidation catalyst characterized by being coated onto the carrier surface of the filter for exhaust gas purification and being formed by comprising an amorphous metal alloy powder.