Four-Volume Electrochemical Cell for Ambient Ammonia Synthesis
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Solution Overview
Problem
Current methods for ammonia synthesis, such as the Haber Bosch process and electrochemical methods, require pressurization, heating, or separate electrolysis stages, making them complex and inefficient for producing ammonia from water and nitrogen at ambient conditions.
Innovation Solution
An electrochemical cell with four volumes and specific electrolytes and electrodes is used, where steam is introduced into one volume and nitrogen into another, with applied voltages to facilitate the reaction of protons and nitride ions at a ground electrode to produce ammonia, eliminating the need for separate hydrogen generation and simplifying the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Haber Bosch process is used for ammonia synthesis, then ammonia production is achieved, but pressurization and heating are required making the process complex and energy-intensive
Solution Approach 1:
The patent replaces the mechanical pressurization and heating system of the Haber Bosch process with an electrochemical system that uses electrical energy to drive the ammonia synthesis reaction at ambient temperature and pressure, thereby eliminating the need for high-pressure compressors and high-temperature heating equipment
Solution Approach 2:
The patent changes the operating parameters from high temperature and high pressure (Haber Bosch) to ambient temperature and pressure with applied voltage (electrochemical method), fundamentally altering the conditions under which ammonia synthesis occurs to reduce energy consumption
2Productivity
If electrochemical synthesis with molten salt electrolyte is used, then ammonia can be synthesized electrochemically, but the system requires complex setup with multiple electrodes and separate electrolysis stages
Solution Approach 1:
The patent merges the hydrogen generation and nitrogen reduction reactions into a single electrochemical cell with a shared electrolyte, where protons and nitride ions are simultaneously generated and combine at the cathode to form ammonia, eliminating the need for separate electrolysis stages
Solution Approach 2:
The aqueous electrolyte in the patent serves multiple functions simultaneously: it conducts protons from the anode, conducts nitride ions from the cathode, and enables both hydrogen generation and nitrogen reduction reactions within the same system
3Quantity of substance
If separate hydrogen generation is used, then hydrogen supply for ammonia synthesis is ensured, but additional equipment and process stages are required
Solution Approach 1:
The patent combines hydrogen generation and ammonia synthesis into a single integrated electrochemical process where water is oxidized at the anode to produce protons that migrate through the electrolyte and combine with nitride ions at the cathode, eliminating the need for separate hydrogen generation equipment
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 approach allows for efficient ammonia synthesis at ambient conditions without the need for separate hydrogen generation, simplifying the system design and optimizing each process individually, while enabling the use of steam as a hydrogen source.
Implementation Method 1
anode reaction: 3H2O=>6H++ 3/2O2+6e-
Implementation Method 2
cathode reaction: N2+6e−=>2N3−
Implementation Method 3
The first ionic component traverses the first electrolyte under the influence of the voltage gradient between the anode and the ground electrode, to reach the ground electrode. The second ionic component traverses the second electrolyte under the influence of the voltage gradient between the cathode and the ground electrode
Implementation Method 4
At the ground electrode the N3− and H+ ions combine to form ammonia NH3 product
Data Source
AI summary
An electrochemical cell has four volumes. A porous anode is provided between a first volume and a second volume. A ground electrode is provided between the second volume (2) and the third volume. A porous cathode is provided between the third volume and the fourth volume.