Mesoporous Chabazite Zeolite for High-Temperature CO2 Adsorption
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Solution Overview
Problem
Current carbon dioxide adsorbents face challenges in achieving high adsorption capacity at elevated temperatures and pressures, which are necessary for effective CO2 capture in industrial settings like fossil fuel-based power plants and natural gas wells.
Innovation Solution
A mesoporous chabazite zeolite with an alkali metal or alkaline earth metal ion, having a specific Si/Al mole ratio and pore structure, is developed through structural transformation and hydrothermal treatment, enhancing adsorption capacity at high temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional adsorbents (carbon materials, zeolites, MOF) are used for CO2 adsorption, then adsorption efficiency is achieved at low temperatures (0°C to room temperature), but adsorption capacity becomes too low at higher temperatures (200-550°C)
Solution Approach 1:
The patent modifies the zeolite structure by changing compositional parameters (Si/Al ratio of 1-9.9) and physical parameters (creating mesopores with 1-10 nm pore size), which enables the material to maintain high adsorption capacity at elevated temperatures up to 550°C while preserving effectiveness at lower temperatures
Solution Approach 2:
The invention creates a composite structure within the zeolite material by forming mesopores (intermediate pores) within the chabazite framework, combining the properties of microporous zeolite with mesoporous structures to achieve enhanced adsorption capacity across a broad temperature range including industrial conditions
2Quantity of substance
If adsorbents are designed for high adsorption capacity, then CO2 capture efficiency improves, but the material becomes unsuitable for industrial conditions requiring elevated temperatures and pressures
Solution Approach 1:
The patent optimizes structural parameters including Si/Al ratio (1-9.9), pore size (1-10 nm), and mesoporous volume (0.05-0.50 cm³/g) to create a material that adapts to both high-temperature industrial conditions (200-550°C) and elevated pressures while maintaining high adsorption capacity
Solution Approach 2:
The mesoporous chabazite zeolite exhibits dynamic adaptability to varying operating conditions, allowing the material to adjust its adsorption characteristics to match industrial process requirements for temperature and pressure while maintaining effective CO2 capture performance
3Temperature
If hydrotalcite is used for CO2 adsorption, then adsorption capacity of 1-2 wt% is achieved at 200-300°C, but the capacity is too low for practical application
Solution Approach 1:
The patent fundamentally changes the material class from hydrotalcite to mesoporous chabazite zeolite, optimizing parameters including Si/Al ratio, pore size distribution, and surface area to achieve adsorption capacities significantly exceeding 1-2 wt% at temperatures from 200-550°C, making the material suitable for practical industrial application
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 mesoporous chabazite zeolite exhibits significantly increased CO2 adsorption capacity and efficiency at temperatures up to 500°C and pressures above 20 atm, making it suitable for industrial CO2 capture applications.
Implementation Method 1
The capture of carbon dioxide refers to a process of physically or chemically separating CO2 among a gas mixture generated from chemical reactions or combustion of fossil fuels. In order to capture CO2 by adsorption, carbon materials, zeolites, metal-organic composite materials (MOF), or the like may be used.
Implementation Method 2
adding the zeolite and a surfactant to an aqueous solution of a strong base having an alkali metal ion or alkaline earth metal ion to obtain a mixture; and subjecting the mixture to a hydrothermal treatment to obtain a mesoporous chabazite zeolite including the alkali metal ion or alkaline earth metal ion
Data Source
AI summary
A carbon dioxide adsorbent may include a chabazite zeolite containing an alkali metal ion or alkaline earth metal ion. The chabazite zeolite may have a Si/Al mole ratio of about 1 to about 9.9 and mesopores. The carbon dioxide adsorbent may be included in a carbon dioxide capture module. The carbon dioxide adsorbent may also be used in a method of separating carbon dioxide.