Boehmite Copper Adsorbent for CO Selectivity
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Solution Overview
Problem
Current carbon monoxide adsorbents face challenges in achieving high selectivity and uniform dispersion of copper(I) compounds, leading to inefficient separation and purification of carbon monoxide from steel-making by-product gases like Linz-Donawitz gas and Blast Furnace gas.
Innovation Solution
A highly selective carbon monoxide adsorbent is developed using boehmite or pseudo-boehmite as a support, with a copper compound dispersed thermally or impregnated, providing a high specific surface area, pore volume, and pore size for enhanced carbon monoxide adsorption and selectivity over carbon dioxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper(I) compound is used as adsorbent, then carbon monoxide selectivity is improved, but uniform dispersion is worsened due to insolubility in general solvents
Solution Approach 1:
The patent introduces a specific solvent system (aqueous ammonia solution or aqueous alkali metal hydroxide solution) as an intermediary medium that enables the copper(I) compound to dissolve and disperse uniformly. This mediator allows the insoluble copper(I) compound to be impregnated into the porous support structure, resolving the contradiction between maintaining selectivity and achieving uniform dispersion.
Solution Approach 2:
The patent changes the chemical parameters of the impregnation process by using specific pH-controlled aqueous solutions (ammonia or alkali metal hydroxide solutions). By adjusting the solvent composition and pH parameters, the copper(I) compound becomes soluble and can be uniformly dispersed in the support, while maintaining its adsorption properties.
2Reliability
If copper(II) salts are deposited and reduced to copper(I) salts, then carbon monoxide adsorption is improved, but uniform dispersion is worsened
Solution Approach 1:
The patent performs preliminary action by directly impregnating the copper(I) compound in its active form into the support using a suitable solvent, rather than first depositing copper(II) salts and then reducing them. This preliminary preparation of the copper(I) compound in a soluble form ensures uniform dispersion from the beginning, while maintaining the required adsorption capability.
3Productivity
If adsorbent capacity is increased to handle large carbon monoxide amounts, then productivity is improved, but selectivity over carbon dioxide is worsened
Solution Approach 1:
The patent creates a composite material system combining a porous support (activated carbon, silica gel, or alumina) with a copper(I) compound impregnated in a specific ratio and distribution. This composite structure allows the support to provide high capacity through its porous network while the copper(I) compound maintains high selectivity through its specific interaction with carbon monoxide molecules.
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 adsorbent achieves a high pure component selectivity of carbon monoxide to carbon dioxide, adsorbing a large amount of carbon monoxide while minimizing carbon dioxide adsorption, significantly improving carbon monoxide separation efficiency compared to existing adsorbents.
Implementation Method 1
a highly selective carbon monoxide adsorbent that has a high selectivity to carbon monoxide and that includes a boehmite or pseudo-boehmite as a support in which a copper compound is dispersed
Implementation Method 2
a copper(I) compound is not dissolved in a general solvent in the carbon monoxide adsorbent
Data Source
AI summary
A highly selective carbon monoxide adsorbent and a method of preparing the highly selective carbon monoxide adsorbent are provided. The highly selective carbon monoxide adsorbent includes a boehmite or pseudo-boehmite in which a copper compound is dispersed.