H-Type Zeolite Adsorbent for High-Capacity CO2 Capture
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Solution Overview
Problem
The natural gas steam reforming process generates significant amounts of carbon dioxide, which needs to be efficiently captured to reduce greenhouse gas emissions and improve the environmental sustainability of hydrogen production.
Innovation Solution
A carbon dioxide adsorbent using X-type or Y-type zeolite with replaced alkali metal or alkali earth metal cations with H+ ions, integrated into a device and process that includes steam methane reforming, water gas shift, and pressure swing adsorption to separate and collect CO2, enhancing adsorption working capacity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional zeolite adsorbents are used for CO2 capture, then the adsorption capacity is insufficient, but increasing the adsorbent quantity increases device size and operational costs
Solution Approach 1:
The patent modifies the chemical composition parameters of the zeolite adsorbent by replacing alkali metal cations (Na+, K+) and alkali earth metal cations (Ca2+, Mg2+) with hydrogen ions (H+) through ion exchange. This parameter change transforms the adsorbent into H-type zeolite, which significantly enhances CO2 adsorption working capacity without increasing device size, as the improved performance comes from enhanced molecular-level interaction rather than increased quantity.
Solution Approach 2:
The patent creates a composite material system by combining H-type zeolite with specific physical and chemical properties for CO2 capture. The H-type zeolite structure maintains the porous framework of conventional zeolites while introducing hydrogen ions that provide enhanced CO2 adsorption capability, achieving high working capacity within the same volume constraints.
2Quantity of substance
If conventional zeolite adsorbents are used for CO2 capture, then the adsorption working capacity is insufficient, but increasing the adsorbent quantity increases operational costs
Solution Approach 1:
The patent changes the chemical composition parameters through ion exchange processes, replacing expensive alkali metal and alkali earth metal cations with hydrogen ions. This parameter change reduces material costs while simultaneously improving CO2 adsorption working capacity, making the adsorbent more cost-effective to manufacture and operate.
Solution Approach 2:
The H-type zeolite adsorbent achieves high working capacity through enhanced molecular interaction mechanisms rather than requiring large quantities of expensive material. The ion-exchanged structure provides superior performance that reduces the need for costly adsorbent replacement and regeneration operations.
3Stability of the object's composition
If alkali metal cations or alkali earth metal cations are used in zeolite, then the structural stability is maintained, but the CO2 adsorption working capacity is reduced
Solution Approach 1:
The patent changes the cation type parameter from alkali metal/alkali earth metal cations to hydrogen ions while maintaining the zeolite framework structure. The H-type zeolite preserves structural stability through the maintained porous framework architecture while achieving superior CO2 adsorption working capacity through the unique properties of hydrogen ion interactions with CO2 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 high carbon dioxide capture rates and working capacities within a given pressure swing range, improving the efficiency of the carbon dioxide pressure swing adsorption process, reducing device size, and lowering operational costs.
Implementation Method 1
a carbon dioxide adsorbent for collecting carbon dioxide generated during a natural gas reforming process at a high concentration
Implementation Method 2
a first pressure swing adsorption (PSA) device that separates carbon dioxide and hydrogen generated from the WGS device
Data Source
AI summary
The present invention is to provide a carbon dioxide adsorbent that can collect carbon dioxide generated during a natural gas reforming process at a high concentration and has an excellent adsorption working capacity, a manufacturing method of the same, and a device and process using the same. The carbon dioxide adsorbent according to various examples of the present invention is characterized by including X-type or Y-type zeolite in which at least a part of alkali metal cations or alkali earth metal cations is replaced with H+ ions.