Exhaust Gas Purification Catalyst with Neodymium Gradient
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Solution Overview
Problem
Existing exhaust gas purification catalysts are inadequate for efficiently purifying hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx) at low temperatures and struggle with responsiveness and durability, especially when transitioning from low-temperature to high-temperature exhaust gas conditions.
Innovation Solution
An exhaust gas purification catalyst with a three-dimensional structure containing palladium, divided into regions with varying neodymium concentrations, where the first region has a higher neodymium concentration than the second region, and both regions include neodymium-containing zirconium oxides to enhance rhodium distribution and catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional exhaust gas purification catalyst is used, then the catalyst structure is simple and easy to manufacture, but the catalytic responsiveness is low and purification efficiency at low temperatures is insufficient
Solution Approach 1:
The catalyst is divided into multiple regions with different neodymium concentrations: a first region with higher neodymium concentration and a second region with lower neodymium concentration. This segmentation allows different regions to perform different functions - the first region provides high catalytic activity at low temperatures, while the second region maintains overall catalyst stability and structure.
Solution Approach 2:
Different regions of the catalyst are assigned different local compositions - the first region contains a higher concentration of neodymium for enhanced low-temperature activity, while the second region has a lower concentration for structural stability. This local quality differentiation optimizes overall catalyst performance across varying temperature conditions.
2Loss of energy
If the catalyst operates at low temperatures, then energy consumption is reduced, but purification efficiency of HC, CO, and NOx is insufficient
Solution Approach 1:
The catalyst composition is modified by introducing neodymium at varying concentrations in different regions. This parameter change in chemical composition enables the catalyst to maintain high purification efficiency at low operating temperatures, eliminating the need for high energy input while achieving effective exhaust gas treatment.
3Temperature
If the catalyst is exposed to sudden high-temperature exhaust gas, then the exhaust gas temperature increases rapidly, but the catalyst cannot immediately purify the exhaust gas due to thermal shock
Solution Approach 1:
The catalyst structure incorporates a second region with lower neodymium concentration that provides thermal stability and structural support. This region acts as a buffer that protects the catalyst structure from sudden thermal shocks when high-temperature exhaust gas is introduced, maintaining catalyst integrity and continuous purification capability.
4Productivity
If the catalyst uses high concentrations of precious metals, then purification activity is improved, but cost increases and catalyst complexity increases
Solution Approach 1:
Instead of uniformly distributing precious metals throughout the catalyst, the invention concentrates neodymium in the first region where it is most needed for low-temperature activity, while reducing its concentration in the second region. This localized quality optimization maintains high purification activity while reducing overall precious metal content and simplifying catalyst composition.
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 effectively purifies HC, CO, and NOx at low temperatures, demonstrating improved responsiveness and durability, capable of handling sudden changes in exhaust gas temperature and volume, with a high purification rate and long-term NOx removal efficiency.
Implementation Method 1
a region containing palladium, the region being provided on a three-dimensional structure; and a first region and a second region being provided on the region containing palladium... capable of purifying hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx) in exhaust gas at low temperatures
Data Source
AI summary
In order to provide an exhaust gas purification catalyst capable of purifying hydrocarbons, carbon monoxide, and nitrogen oxides in exhaust gas at low temperatures, the exhaust gas purification catalyst according to the present invention includes: a region (2) containing palladium on a three-dimensional structure (1), and a first region (3) and a second region (4) provided on the region (2) in order from an inflow side of exhaust gas to an outflow side of exhaust gas. The concentration of neodymium contained in the first region (3) is higher than the concentration of neodymium contained in the second region (4).