Nickel Catalyst Atomic Layer Deposition for CO Oxidation
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Solution Overview
Problem
Nickel oxide catalysts used for oxidizing carbon monoxide suffer from rapid deactivation at high temperatures due to particle aggregation, leading to loss of catalytic reactivity and stability, necessitating a technology to enhance their stability and activity at elevated temperatures.
Innovation Solution
A nickel-based catalyst is prepared by forming nickel oxide on a mesoporous support using atomic layer deposition, which restricts particle size to nanometer scales, allowing for stable catalytic activity at room temperature and regenerating reactivity through annealing, preventing carbon deposition and maintaining activity across multiple cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nanosized nickel oxide catalyst is used, then catalytic reactivity is improved, but particle size increases due to aggregation at high temperatures leading to loss of reactivity and stability
Solution Approach 1:
The patent employs a mesoporous support structure with controlled pore sizes to confine nickel oxide nanoparticles. The porous architecture provides physical constraints that prevent particle aggregation while maintaining high surface area and catalytic activity. The mesoporous structure allows reactant access to active sites while stabilizing nanoparticle dispersion at elevated temperatures.
Solution Approach 2:
The patent creates a composite catalyst system by combining nickel oxide nanoparticles with a mesoporous support material. This composite structure integrates the high reactivity of nanosized nickel oxide with the structural stability and thermal resistance of the porous support, achieving both improved catalytic performance and resistance to particle aggregation.
2Quantity of substance
If nickel oxide catalyst is used as alternative to noble metal catalysts, then cost is reduced, but deactivation occurs quickly
Solution Approach 1:
The patent optimizes critical parameters including nickel oxide particle size (nanoscale), support pore size (mesoporous range), and surface area to enhance catalyst durability. By controlling these parameters, the catalyst achieves improved resistance to deactivation mechanisms such as particle aggregation and carbon deposition, extending operational lifetime while maintaining cost advantages.
Solution Approach 2:
The patent addresses carbon deposition, a harmful deactivation mechanism, by utilizing the mesoporous structure to facilitate oxygen diffusion and promote combustion of deposited carbon. The porous architecture transforms the potential harm of carbon accumulation into a self-cleaning mechanism where oxygen access through pores enables regeneration of active sites.
3Speed
If carbon monoxide oxidation is conducted at high temperatures, then reaction rate increases, but catalyst deactivation accelerates due to particle aggregation
Solution Approach 1:
The mesoporous support provides thermal stability and physical confinement for nickel oxide particles during high-temperature operation. The porous structure maintains particle dispersion and prevents aggregation even at elevated temperatures, enabling sustained high reaction rates without accelerated deactivation.
Solution Approach 2:
The patent enables continuous catalytic operation by preventing particle aggregation through mesoporous confinement. The stable nanoparticle dispersion maintained throughout operation ensures continuous access to active sites, allowing sustained high reaction rates over extended periods without interruption for catalyst regeneration or replacement.
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 nickel-based catalyst exhibits stable and regenerable catalytic activity for carbon monoxide oxidation at room temperature, maintaining high reactivity even after repeated annealing and resisting carbon deposition, effectively addressing the temperature-induced deactivation issues.
Implementation Method 1
forming nickel oxide on the surface of a mesoporous support by one or more cycles of atomic layer deposition
Implementation Method 2
regenerating reactivity through annealing
Implementation Method 3
oxidizing carbon monoxide
Data Source
AI summary
The present invention relates to a nickel-based catalyst for oxidizing carbon monoxide, which is prepared by forming nickel oxide on the surface of a mesoporous support by one or more cycles of atomic layer deposition, and a use thereof.The nickel-based catalyst for oxidizing carbon monoxide according to the present invention is stable at high temperatures because the size of the nickel oxide particles can be restricted to nanometer scales even at high-temperature conditions. In addition, the nickel-based catalyst exhibits catalytic reactivity for oxidation of carbon monoxide even at room temperatures. Additionally, the catalytic activity, which has been deactivated after conducting the catalytic reaction, can be regenerated through annealing and increased gradually through repeated annealing.