Copper-Plated Nickel Sponge Catalyst for Alcohol Reforming
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Solution Overview
Problem
Current alcohol dehydrogenation catalysts face challenges such as inadequate stability, incomplete conversion, and the formation of unwanted by-products during the reforming of alcohols like methanol and ethanol, particularly due to coking and the presence of acid sites, which reduce efficiency and stability at moderate reaction temperatures.
Innovation Solution
A copper-containing catalyst with a metal supporting structure, specifically a copper-plated nickel sponge, is used for alcohol reforming, which enhances thermal conductivity, stability, and activity, preventing coking and improving the conversion of acetaldehyde to methane and carbon monoxide at moderate temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional copper-zinc oxide catalysts are used for alcohol reforming, then the catalyst exhibits excellent stability for methanol synthesis, but it has inadequate stability for methanol reforming and suffers from coking
Solution Approach 1:
The patent uses a composite catalyst structure consisting of copper particles supported on a metal oxide surface (e.g., zinc oxide, alumina, silica). This composite structure combines the high reforming activity of copper with the stability and resistance to coking of the metal oxide support, resolving the contradiction between catalyst stability and coking resistance.
Solution Approach 2:
The patent extracts and removes acid sites from the catalyst surface through treatment with base solutions (e.g., aqueous ammonia, sodium hydroxide). By removing these harmful acid sites that promote coking and unwanted by-product formation, the catalyst maintains stability while reducing harmful effects.
2Productivity
If alcohol reforming is conducted at elevated temperatures to improve conversion efficiency, then the reforming reaction proceeds faster, but coking increases and catalyst stability decreases
Solution Approach 1:
The patent optimizes the copper particle size and surface area parameters to achieve high conversion efficiency at moderate temperatures. By controlling the copper crystallite size (e.g., 2-10 nm) and surface area, the catalyst maintains high activity without requiring excessive temperature, thus preventing coking and maintaining stability.
Solution Approach 2:
The metal oxide support acts as an intermediary between the copper active sites and the reactants. It facilitates the reforming reaction at lower temperatures while preventing direct contact conditions that would lead to coking, thereby enabling high conversion efficiency with maintained catalyst stability.
3Productivity
If the catalyst surface contains acid sites to promote certain reactions, then reaction activity increases, but unwanted by-products form and coking occurs
Solution Approach 1:
The patent selectively removes acid sites from the catalyst surface by treating with base solutions. This extraction eliminates the source of unwanted by-products and coking while preserving the basic catalytic function for alcohol reforming, achieving high activity without harmful effects.
Solution Approach 2:
The patent creates a catalyst with localized basic properties on the metal oxide support surface while maintaining copper active sites. This local quality modification ensures that the catalyst promotes desired reforming reactions without generating unwanted by-products associated with acid-catalyzed side reactions.
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 copper-plated nickel sponge catalyst achieves high conversion efficiency and stability for alcohol reforming, producing hydrogen and carbon dioxide suitable for fuel cells, while minimizing by-product formation and extending catalyst life, thus improving energy efficiency and reducing emissions.
Implementation Method 1
contacting primary alcohols with a suitable catalyst at elevated temperatures (e.g., in excess of 200° C.) causes the alcohol to decompose to hydrogen gas and carbon-containing species
Implementation Method 2
The reforming process is endothermic and requires efficient heat transfer to the catalyst
Implementation Method 3
preventing coking
Implementation Method 4
CO+H2O→CO2+H2 This conversion is known as the water-gas shift reaction
Data Source
AI summary
This invention is directed to a process for reforming an alcohol. The process comprises contacting an alcohol with a reforming catalyst comprising copper at the surface of a metal supporting structure, preferably a metal sponge supporting structure comprising nickel. In a certain preferred embodiment, hydrogen produced by the reforming process is used as a fuel source for a hydrogen fuel cell to generate electric power, particularly for driving a vehicle.