Nickel-Copper Hydrocarbon Decomposition Catalyst Against Sintering
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Solution Overview
Problem
Existing catalysts for hydrocarbon decomposition, particularly those using nickel, suffer from carbon deposition and nickel particle sintering, leading to rapid deactivation and reduced efficiency.
Innovation Solution
A catalyst configuration involving a nickel-containing layer supported on a copper or copper alloy substrate, with an optional copper interlayer, subjected to diffusion treatment, which enhances catalytic performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nickel is used as catalyst for methane decomposition, then hydrogen production efficiency is improved, but carbon deposition and nickel particle sintering occur leading to catalyst deactivation
Solution Approach 1:
A copper interlayer is introduced between the nickel-containing layer and the support layer. This copper interlayer acts as an intermediary that prevents direct contact between nickel particles and the support, thereby preventing nickel particle sintering and carbon deposition on the support. The copper layer mediates the interaction between nickel and support, maintaining catalyst stability while preserving hydrogen production efficiency.
Solution Approach 2:
The catalyst employs a composite structure consisting of multiple layers: a support layer, a copper interlayer, and a nickel-containing layer. This composite material structure combines the advantages of different materials - the support provides mechanical strength, the copper interlayer prevents sintering and carbon deposition, and the nickel layer provides catalytic activity for hydrogen production.
2Productivity
If nickel fine particles are used for catalysis, then catalytic activity is improved, but particle aggregation due to sintering occurs at high temperature
Solution Approach 1:
The copper interlayer serves as a physical barrier and intermediary that prevents nickel fine particles from migrating and aggregating on the support surface. By placing copper between nickel particles and the support, the invention stops the sintering process while maintaining the fine particle structure and high catalytic activity of nickel.
Solution Approach 2:
The invention extracts the harmful function of the support surface that causes nickel particle aggregation. By removing nickel particles from direct contact with the support surface through the copper interlayer, the harmful interaction is eliminated while the beneficial catalytic function of nickel is preserved.
3Productivity
If carbon particles are deposited on catalyst surface, then hydrogen production is enhanced, but active sites are physically covered leading to deactivation
Solution Approach 1:
The copper interlayer acts as an intermediary barrier that prevents carbon particles from reaching and covering the nickel active sites. Carbon can still be produced and utilized, but the copper layer blocks the harmful effect of carbon deposition on the catalyst surface, maintaining both hydrogen production and catalyst activity.
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 maintains high hydrogen production efficiency for an extended period, resisting deactivation and improving catalytic ability through the use of copper diffusion and interlayer formation.
Implementation Method 1
subjecting the copper-plated surface to a diffusion treatment in vacuum, nitrogen gas or argon gas and forming said nickel-containing layer, or subjecting a surface of said support layer consisting of nickel or iron-nickel alloy to copper plating and subjecting the copper-plated surface to a diffusion treatment in vacuum, nitrogen gas or argon gas. In the above configuration, a plated copper diffuses into an inside of the support layer
Data Source
AI summary
A catalyst for decomposition of hydrocarbons is provided, the catalyst being resistant to deterioration of catalytic properties and suitable for producing hydrogen in a highly efficient manner for a long period. The catalyst includes a nickel-containing layer exposed on a support layer consisting of iron, cast iron, steel, copper, nickel, copper alloy or iron-nickel alloy. The catalyst for the decomposition of hydrocarbons is obtained by contacting the catalyst as a raw material with methane gas at an elevated temperature of 800° C. for 4 to 72 hours with an average residence time beyond 14 minutes. The catalyst may have an interlayer including copper between the support layer and the nickel-containing layer, otherwise the support layer may be copper or copper alloy.