Electrochemical Ammonia Production Using Molybdenum Complex Catalyst
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Solution Overview
Problem
Existing ammonia production methods face challenges such as operation at low temperatures, cumbersome membrane treatment processes, and difficulties in recovering and recycling reducing agents like samarium(II) iodide and decamethylcobaltocene.
Innovation Solution
An electrochemical ammonia production method using a molybdenum complex in combination with a solid catalyst, such as platinum or zinc oxide, at room temperature, eliminating the need for reducing agents and membrane pretreatment, and employing a membrane electrode assembly or gas diffusion electrode for efficient ammonia production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electrolysis is performed at low temperature (90-100°C), then ammonia production can be achieved, but operation at room temperature (20-30°C) becomes difficult
Solution Approach 1:
The patent changes the temperature parameter from high temperature (90-100°C) to room temperature (20-30°C) by introducing a specific catalyst system (molybdenum complex with PNP ligand and solid catalyst) that enables the electrolysis reaction to proceed efficiently at lower temperatures, thus resolving the contradiction between achieving ammonia production and operating at room temperature
2Reliability
If Nafion membrane is used as electrolyte membrane, then electrolysis can be performed, but cumbersome pretreatment with ammonia is required before incorporation
Solution Approach 1:
The patent extracts and eliminates the cumbersome pretreatment step by using a different electrolyte membrane material that does not require ammonia treatment before incorporation into the electrolyzer, thus maintaining electrolysis functionality while simplifying the manufacturing process
3Productivity
If reducing agents like samarium(II) iodide or decamethylcobaltocene are used, then ammonia production is enabled, but recovery and recycle become difficult
Solution Approach 1:
The patent employs a catalyst system (molybdenum complex with PNP ligand combined with solid catalyst) that facilitates ammonia production without requiring external reducing agents, allowing the system to be self-sufficient and eliminating the operational complexity of reducing agent recovery and recycling
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 method enables effective ammonia production from nitrogen molecules at room temperature without the use of reducing agents and simplifies the membrane treatment process, improving operational efficiency and recyclability.
Implementation Method 1
a method of electrolytically producing ammonia from nitrogen molecules in a low temperature range
Implementation Method 2
ammonia can be electrochemically produced by using a complex such as a molybdenum complex in combination with a solid catalyst such as a metal catalyst or an oxide catalyst
Data Source
AI summary
A method for producing ammonia involves producing ammonia from molecular nitrogen in a production apparatus for performing electrolysis by supplying electrons from a power source, protons from a proton source and molecular nitrogen from a device for supplying a nitrogen gas while in the presence of a solid catalyst and a complex in a cathode. For example, a molybdenum complex represented by formula (A1) or formula (B2) as the complex, and a platinum catalyst or a platinum catalyst/gold catalyst combination as the solid catalyst are used.