Nanocrystalline Composite Catalyst for Hydrogen Storage
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Solution Overview
Problem
Existing hydrogen storage and supply systems using precious metal catalysts face challenges in reducing catalyst usage while maintaining reaction efficiency, as finer particles aggregate and substitute transition metals or oxides exhibit lower catalytic activity.
Innovation Solution
A nanocrystalline composite catalyst is developed with flake-like nanocrystalline pieces in a connected state, reducing aggregation and increasing surface area, and combining nanocrystalline metal and metal oxide composites to minimize precious metal usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If catalyst particles are made finer to nanoparticles to increase surface area ratio, then catalytic activity should improve, but the particles aggregate and the active surface cannot be effectively utilized
Solution Approach 1:
The patent employs a composite catalyst structure combining metal particles (precious metal or transition metal) with metal oxide particles. The metal oxide component acts as a stabilizer that prevents aggregation of the metal particles, while the composite structure maintains high surface area for catalytic activity. This composite approach resolves the contradiction by providing both increased active surface area and structural stability against aggregation.
2Quantity of substance
If transition metal or oxide is used to substitute precious metal catalyst, then cost is reduced, but catalytic activity becomes lower
Solution Approach 1:
The patent creates a composite catalyst where transition metals or metal oxides are combined with precious metals in specific configurations. The transition metal/oxide component provides structural support and additional active sites, while the precious metal maintains high catalytic activity. This composite structure allows reduction of precious metal content while preserving or even enhancing overall catalytic performance through synergistic effects.
Solution Approach 2:
The patent applies local quality by creating heterogeneous catalyst structures where different materials (precious metal, transition metal, metal oxide) are distributed in specific spatial arrangements. The precious metal is concentrated in regions where highest catalytic activity is needed, while transition metals and oxides provide structural framework and additional functionality. This localized distribution optimizes both cost and catalytic activity.
3Quantity of substance
If precious metal catalyst amount is reduced, then cost decreases and resource depletion is mitigated, but reaction efficiency decreases
Solution Approach 1:
The patent develops composite catalyst systems where the reduction of precious metal content is compensated by the addition of transition metals and metal oxides that provide alternative catalytic pathways. The composite structure creates multiple active sites with different functionalities, ensuring that overall reaction efficiency is maintained even with reduced precious metal content. The synergistic interaction between different materials in the composite enhances the utilization efficiency of each component.
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 nanocrystalline composite catalyst achieves excellent catalytic activity in hydrogenation and dehydrogenation reactions, effectively reducing precious metal usage and maintaining reaction efficiency through enhanced surface area utilization and catalyst stability.
Implementation Method 1
a nanocrystalline composite catalyst for storing/supplying hydrogen exhibiting excellent catalytic activity in both a hydrogenation involving a hydrogen-storing body containing an aromatic compound, and a dehydrogenation involving a hydrogen-supplying body containing a hydrogen derivative of the aromatic compound
Data Source
AI summary
The present disclosure provides that a catalyst exhibits excellent catalytic activity in both a hydrogenation involving a hydrogen-storing body containing an aromatic compound, and a dehydrogenation involving a hydrogen-supplying body containing a hydrogen derivative of the aromatic compound, wherein the catalyst contains a nanocrystalline composite having two or more accumulated flake-like nanocrystalline pieces in a connected state, the flake-like nanocrystalline pieces each having a main surface and an end surface, and in that the nanocrystalline composite is configured such that, when two adjacent nanocrystalline pieces are viewed, an end surface of at least one of the nanocrystalline pieces is connected.