Bimetal-organic framework synthesis via microwave irradiation
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Solution Overview
Problem
Conventional metal-organic frameworks (MOFs) have limitations in CO2 adsorption capacity, CO2/N2 selectivity, and stability, making them inefficient for industrial applications and costly to produce.
Innovation Solution
A bimetal-organic framework is developed by mixing a first metal precursor with zinc and a coordination compound of organic acid, and a second metal precursor with magnesium, manganese, or copper, followed by microwave irradiation to enhance crystal formation and adsorption properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional solvothermal synthesis is used to prepare metal-organic frameworks, then the framework structure can be formed, but the reaction time is excessively long (several days or more) and energy consumption is high
Solution Approach 1:
The patent replaces conventional thermal heating (solvothermal synthesis) with microwave irradiation for heating the reaction mixture. This substitution of heating mechanism dramatically reduces reaction time from several days to just a few hours while maintaining effective framework formation, directly resolving the contradiction between synthesis speed and energy consumption
Solution Approach 2:
The patent employs periodic microwave irradiation with specific power cycles (e.g., 300W for 10min, 200W for 10min, 100W for 10min) to control the synthesis process. This periodic action allows efficient energy input while preventing excessive energy consumption and overheating, achieving fast synthesis with optimized energy use
2Productivity
If conventional synthesis methods are used for porous MOFs, then the framework can be synthesized, but manufacturing costs are high and efficiency is low
Solution Approach 1:
By replacing conventional prolonged thermal solvothermal synthesis with microwave-assisted synthesis, the patent achieves the same framework formation in hours rather than days. This dramatically improves synthesis efficiency and reduces manufacturing costs by minimizing energy consumption and production time
Solution Approach 2:
The patent optimizes synthesis parameters including microwave power (100-300W), irradiation time (1-6 hours), and precursor concentrations to achieve efficient synthesis. These parameter optimizations enable high-yield framework production with reduced energy input, directly improving both efficiency and cost-effectiveness
3Quantity of substance
If conventional MOFs are used for CO2 adsorption, then the framework structure provides basic adsorption capability, but CO2 adsorption capacity and CO2/N2 selectivity are insufficient
Solution Approach 1:
The patent synthesizes bimetallic Zn-M (M = Ni, Co, Cu, Mn) composite frameworks by combining zinc with transition metals. This composite structure creates synergistic effects that enhance both CO2 adsorption capacity and CO2/N2 selectivity, resolving the contradiction between quantity of CO2 adsorbed and selectivity reliability
Solution Approach 2:
The patent introduces heterometal atoms (Ni, Co, Cu, Mn) at specific positions within the MOF framework to create local active sites with enhanced CO2 affinity. These localized modifications improve CO2 selectivity without compromising overall framework stability, achieving high capacity and selectivity simultaneously
4Reliability
If conventional MOFs are exposed to moisture and acidic conditions, then the framework structure degrades, but stability in use environment is poor
Solution Approach 1:
The patent creates bimetallic Zn-M composite frameworks where transition metals (Ni, Co, Cu, Mn) strengthen the framework structure and enhance resistance to moisture and acid. This composite composition maintains framework stability under harsh conditions while ensuring reliable environmental stability for practical applications
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 bimetal-organic framework exhibits improved CO2 adsorption capacity and CO2/N2 adsorption selectivity compared to conventional MOFs, while maintaining stability even when exposed to moisture and acidic conditions.
Implementation Method 1
irradiating microwave to the second mixture
Implementation Method 2
bimetal-organic framework for absorbing carbon dioxide
Data Source
AI summary
The present disclosure relates to a method for preparing a bimetal-organic framework including preparing a first mixture by mixing, in a solvent, a first metal precursor including zinc, a coordination compound of organic acid, and a substance including a counterion of the coordination compound; preparing a second mixture by mixing, in the first mixture, a second metal precursor including at least one metal selected from a group of magnesium, manganese, and copper, and irradiating the second mixture with the microwave.