Iron-Copper-Sulfur Catalyst for Electrochemical Ammonia Synthesis
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Solution Overview
Problem
The Haber-Bosch process for ammonia synthesis is energy-intensive and emits significant greenhouse gases, while electrochemical ammonia synthesis methods face low efficiency due to the challenge of reducing nitrogen molecules into ammonia at the cathode, often resulting in hydrogen production instead.
Innovation Solution
A catalyst comprising iron, copper, and sulfur, supported on a carbon carrier and coated on electrodes, is used for electrochemical ammonia synthesis, inhibiting hydrogen production and enhancing nitrogen reduction, thereby increasing ammonia synthesis efficiency and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Haber-Bosch process is used for ammonia synthesis, then ammonia production efficiency is high, but energy consumption is significantly large and greenhouse gas emissions are high
Solution Approach 1:
The patent replaces the traditional thermal Haber-Bosch process with an electrochemical ammonia synthesis system. This substitution uses electrical energy to drive the nitrogen reduction reaction at the cathode, eliminating the need for high-temperature thermal processing and fossil fuel combustion, thereby significantly reducing greenhouse gas emissions while maintaining ammonia production efficiency
Solution Approach 2:
The patent changes the operating parameters from high temperature (400-500°C) and high pressure (150-250 bar) in the Haber-Bosch process to milder electrochemical conditions. By using an electrocatalyst and applying electrical potential, the reaction can proceed at lower temperatures and pressures, reducing energy consumption while achieving comparable productivity
2Use of energy by moving object
If electrochemical ammonia synthesis is used, then energy consumption is reduced, but ammonia synthesis efficiency is low due to hydrogen generation instead of nitrogen reduction
Solution Approach 1:
The patent introduces an electrocatalyst as an intermediary substance to facilitate the nitrogen reduction reaction. The electrocatalyst, comprising specific metal components supported on a conductive substrate, acts as a mediator that preferentially adsorbs and activates nitrogen molecules, lowering the activation energy for nitrogen reduction and suppressing the competing hydrogen evolution reaction, thereby improving ammonia synthesis efficiency
Solution Approach 2:
The patent employs composite electrocatalyst materials combining multiple metal components with a conductive support structure. This composite structure provides synergistic effects where different metal components work together to enhance nitrogen adsorption and reduction activity while maintaining electrical conductivity, thus improving both energy efficiency and ammonia production rate
3Productivity
If a nitrogen reduction-selective catalyst is used, then ammonia yield increases, but device complexity increases due to catalyst coating requirements
Solution Approach 1:
The patent uses a porous conductive support structure for the electrocatalyst. The porous structure provides high surface area for catalyst dispersion, enabling effective nitrogen reduction activity. The porosity allows efficient mass transport of reactants and products, while the conductive nature ensures good electrical contact. This structure simplifies the overall device design by integrating multiple functions in a single component
Solution Approach 2:
The electrocatalyst design integrates multiple functions into a single component: it provides electrical conductivity for electron transfer, offers active sites for nitrogen adsorption and reduction, and serves as a structural support. This multi-functionality reduces device complexity by eliminating the need for separate components for each function, while still achieving high ammonia yield
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 catalyst significantly improves ammonia synthesis activity, achieving several times to several tens of times the activity of conventional single metal or metal oxide catalysts, leading to higher production yield and rate with reduced energy consumption and carbon emissions.
Implementation Method 1
cathode reaction (3-2) in which water and nitrogen are reduced to produce water and ammonia
Implementation Method 2
it is essential to coat an electroconductive electrode functioning as a cathode with a nitrogen reduction-selective catalyst in order to increase yield of ammonia
Implementation Method 3
The catalyst may be supported in a carbon carrier in an amount of 20-65 wt % based on the weight of carbon
Data Source
AI summary
ABSTRACT OF THE DISCLOSURE A catalyst for electrochemical ammonia synthesis incudes a carbon carrier composed of carbon; and 20-65 wt% of iron, copper and sulfur, based on weight of the carbon, supported in the carbon carrier. The catalyst may be coated on an electrode selected from the group consisting of carbon paper, carbon cloth, carbon felt, fluorine- doped tin oxide (FTO) conducting glass, and combinations thereof by spray coating, screen printing or ink jet printing. The catalyst has an ammonia synthesis activity up to several times to several tens of times of the activity of the existing single metal or metal oxide catalysts. Thus, when using the catalyst, it is possible to provide a method for electrochemical ammonia synthesis having an improved ammonia production yield and rate.