Electrochemical Selective Nitrate Reduction: Pathways to Nitrogen and Ammonia Production
Md Monjorul Islam1, S M Abu Nayem1, Syed Shaheen Shah2
1Department of Chemistry, Jagannath University, Dhaka, 1100, Bangladesh.
Chemical Record (New York, N.Y.)
|December 23, 2024
Summary
Electrochemical nitrate reduction (ECNR) offers a sustainable method to remove nitrate pollution, converting it to nitrogen gas or ammonia. This review highlights advancements in catalysts and strategies for efficient and selective nitrate remediation.
Area of Science:
- Environmental Chemistry
- Electrochemistry
- Materials Science
Background:
- Nitrate contamination from industrial, agricultural, and anthropogenic sources poses significant environmental and health risks.
- Traditional nitrate remediation methods can be costly and generate secondary pollutants.
- Electrochemical nitrate reduction (ECNR) presents a sustainable alternative for nitrate removal and conversion.
Purpose of the Study:
- To review recent advancements in selective ECNR pathways for nitrate-to-nitrogen (N2) and nitrate-to-ammonia (NH3) conversion.
- To explore mechanistic insights, electrocatalyst development, and optimization strategies for ECNR.
- To identify research gaps and future directions for improving ECNR technology.
Main Methods:
- Focus on mechanistic insights into selective ECNR pathways.
- Review of electrocatalyst development, including single-atom, bimetallic, and nanostructured catalysts.
- Discussion of optimization strategies, electrode materials, electrolyte composition, and hydrogen evolution inhibition.
Main Results:
- Advanced catalysts, particularly Pd-Cu systems, enhance faradaic efficiency, N2 removal, and selectivity in ECNR.
- Strategies to overcome challenges like low selectivity and catalyst degradation are explored.
- ECNR shows potential as a sustainable alternative to the Haber-Bosch process for ammonia production.
Conclusions:
- ECNR is a promising technology for sustainable nitrate remediation and ammonia synthesis.
- Further research is needed to improve ECNR efficiency, stability, and scalability.
- Optimized catalysts and process conditions are key to realizing the full potential of ECNR.
Related Concept Videos
01:22Inorganic Nitrogen Assimilation
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
01:15Metabolism of Chemolithotrophs
1
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
1
01:20Overview of Nitrogen Metabolism
7.8K
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
7.8K
01:29Preparation of Amines: Reduction of Oximes and Nitro Compounds
3.4K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
3.4K
01:202° Amines to N-Nitrosamines: Reaction with NaNO2
4.0K
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
4.0K
01:13Preparation of Amines: Reduction of Amides and Nitriles
2.4K
Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
2.4K