Liquid Alloy Ammonia Synthesis Catalyst with Molten Salt Interface
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The Haber-Bosch process for ammonia synthesis requires high temperatures and pressures, leading to high energy consumption and environmental issues, while existing catalysts like alkali metals result in low ammonia production rates.
Innovation Solution
A method using a liquid alloy as a catalyst at normal pressures, with a molten salt providing a reaction interface and preventing oxidation, allowing for continuous ammonia synthesis through a closed chemical loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Haber-Bosch process is used for ammonia synthesis, then ammonia production is achieved, but high energy consumption and environmental problems occur due to high temperature and pressure conditions
Solution Approach 1:
The invention changes the physical state of the catalyst from solid to liquid, and introduces a molten salt medium to enable ammonia synthesis at normal pressures and lower temperatures, fundamentally altering the reaction parameters from the conventional high-pressure high-temperature process
Solution Approach 2:
A molten salt is introduced as an intermediary medium that provides a reaction interface between nitrogen and the liquid alloy catalyst, enabling the reaction to proceed under milder conditions while maintaining high productivity
2Device complexity
If alkali metal is used as catalyst for ammonia synthesis, then the process can be simplified, but the ammonia synthesis rate becomes very low making large-scale synthesis difficult
Solution Approach 1:
The invention uses a composite system consisting of liquid alloy catalyst combined with molten salt medium, which maintains the simplicity of alkali metal-based catalysis while dramatically enhancing the ammonia synthesis rate through the synergistic effect of the liquid state and molten salt interface
Solution Approach 2:
Changing the catalyst from solid alkali metal to liquid alloy state, and introducing molten salt medium, transforms the reaction kinetics to achieve high synthesis rates while keeping the process relatively simple
3Use of energy by moving object
If liquid alloy is used as catalyst at normal pressures, then energy consumption is reduced, but the catalyst is exposed to oxidation from atmosphere and impurities from feed gases
Solution Approach 1:
The molten salt acts as a protective intermediary layer that physically isolates the liquid alloy catalyst from atmospheric oxygen and water vapor, and also traps impurity gases through dissolution, thereby protecting the catalyst while enabling normal pressure operation
Solution Approach 2:
The impurity gases (oxygen, water vapor) that would normally harm the catalyst are converted into beneficial trapped species within the molten salt medium, where they are dissolved or absorbed, transforming potential damage into a protective mechanism
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
This method enables efficient ammonia synthesis under mild conditions, improving production rates and extending catalyst lifespan, facilitating large-scale synthesis while reducing energy consumption and environmental impact.
Implementation Method 1
performing a reaction of hydrogen and nitrogen to synthesize ammonia under normal pressures by taking a liquid alloy as a catalyst in a reactor, where the reactor contains a molten salt
Implementation Method 2
the molten salt can prevent the liquid alloy from contacting with the oxygen and the water vapor from the outside atmosphere, so that the liquid alloy is prevented from being oxidized
Implementation Method 3
the density of the metal oxide is less than that of the liquid alloy and has low solubility in the liquid alloy, therefore, the metal oxide can float to the molten salt for dissolution under the action of bubbles
Data Source
AI summary
A method for catalytic synthesis of ammonia under normal pressures, including: performing a reaction of hydrogen and nitrogen to synthesize ammonia under normal pressures by taking a liquid alloy as a catalyst in a reactor, where the reactor contains a molten salt, the density of the molten salt is smaller than that of the liquid alloy, and the molten salt is used for providing a reaction interface and isolating the liquid alloy from being introduced impurities. The first metal reacts with the nitrogen to produce the metal nitride, and the molten salt provides a new reaction interface for the metal nitride to react with the hydrogen to synthesize ammonia, so that ammonia is produced continuously. In addition, the molten salt prevents the liquid alloy from contacting with the oxygen and the water vapor, which prevents the liquid alloy from being oxidized, thus prolonging its service life.