Metallic nanoparticle catalysts embedded in porous oxide support, which show high catalytic activity even at low temperatures
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Solution Overview
Problem
Nanoparticles used in catalysts, particularly gold nanoparticles, lack stability at high temperatures due to sintering, limiting their use in industrial applications requiring high-temperature environments, and there is a need for stable alternatives to platinum group metals which are scarce and expensive.
Innovation Solution
Embedding metallic nanoparticles in a porous oxide matrix structure, such as silica or alumina, with secured mesopores and micropores, using stabilizers and oxide precursors to ensure thermal and chemical stability, and employing a method that includes functionalizing nanoparticles with polymers and activators to distribute them uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If gold nanoparticles are used as catalysts, then catalytic activity at low temperatures is improved, but stability at high temperatures deteriorates due to sintering
Solution Approach 1:
The patent embeds gold nanoparticles within a porous silica matrix structure. The porous oxide support provides a stable framework that confines the nanoparticles, preventing their migration and sintering at high temperatures while still allowing reactant access to the catalytically active surfaces.
Solution Approach 2:
The patent creates a composite catalyst system combining gold nanoparticles with a porous oxide support matrix. This composite structure integrates the high catalytic activity of metallic nanoparticles with the thermal stability and structural integrity of the oxide support, resolving the contradiction between activity and stability.
2Productivity
If nanoparticle surface area is increased to improve catalytic efficiency, then catalytic activity is improved, but sintering tendency worsens
Solution Approach 1:
The porous silica matrix provides a high surface area support structure that disperses nanoparticles throughout its three-dimensional network. This maintains high catalytic efficiency through increased surface area while the porous structure physically confines particles, preventing sintering even at elevated temperatures.
Solution Approach 2:
The patent creates different functional zones: the nanoparticle surfaces provide catalytic activity while the surrounding porous oxide matrix provides structural stability and particle confinement. Each region performs its specialized function, allowing high surface area nanoparticles to maintain both efficiency and stability.
3Reliability
If platinum group metals are used for catalysts, then catalytic performance is improved, but cost and resource availability worsen
Solution Approach 1:
The patent replaces expensive platinum group metals with gold, which is more abundant and cost-effective. While gold nanoparticles have lower melting points, the porous oxide support provides the necessary stability, creating a more economically viable catalyst that maintains performance without relying on scarce platinum group resources.
Solution Approach 2:
The patent changes the metallic component from platinum group metals to gold, altering the material parameter to achieve better resource availability and cost-effectiveness. The porous support structure compensates for gold's lower thermal stability, maintaining overall catalytic performance while improving economic parameters.
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 resulting catalysts maintain high catalytic activity and stability at low and high temperatures, effectively oxidizing carbon monoxide, methane, hydrogen, volatile organic compounds, and aromatic hydrocarbons, offering a cost-effective alternative to platinum group metals.
Implementation Method 1
Embedding metallic nanoparticles in a porous oxide matrix structure, such as silica or alumina, with secured mesopores and micropores
Implementation Method 2
The resulting catalysts maintain high catalytic activity and stability at low and high temperatures, effectively oxidizing carbon monoxide, methane, hydrogen, volatile organic compounds, and aromatic hydrocarbons
Data Source
AI summary
The present disclosure relates to a porous catalyst including an oxide matrix structure having mesopores and micropores, and metal nanoparticles embedded in the oxide matrix structure, wherein the metal nanoparticles of the porous catalyst have residual compressive stress.