What is plasma-assisted nitrogen fixation (PANF)?

Plasma-assisted nitrogen fixation (PANF) uses energetic electrons, ions, and radicals generated in partially ionized gas phases to activate the N≡N triple bond under conditions far milder than the Haber-Bosch process, which requires 400–500 °C and 150–300 bar. PANF can convert atmospheric N₂ into ammonia, nitrogen oxides, or reactive nitrogen species at ambient or near-ambient conditions.

What are the three main reaction pathways in plasma nitrogen fixation?

The three core pathways are: (1) plasma-catalytic NH₃ synthesis using DBD or gliding arc reactors with transition-metal catalysts; (2) plasma-based NOₓ synthesis from air or N₂/O₂ mixtures for fertilizer precursors or nitric acid feedstocks; and (3) plasma-activated liquid (PAL) nitrogen delivery, where plasma treats water or nutrient solutions to generate dissolved reactive nitrogen species for direct agricultural application.

How does in situ adsorption improve plasma ammonia synthesis yields?

A critical bottleneck for plasma-NH₃ synthesis is product decomposition within the plasma zone. Research from the University of Twente (2022) demonstrated that zeolite 4A adsorbents placed within the reactor suppress back-reaction of ammonia, doubling ammonia yield without requiring fundamental reactor redesign.

Which institutions lead plasma-assisted nitrogen fixation research?

European institutions dominate: the University of Antwerp's PLASMANT group leads in plasma-catalytic mechanistic research; the University of Twente leads in process intensification; the University of Salerno contributes structured catalyst design; Newcastle University contributes integrated process roadmaps; and Cambridge University contributes techno-economic feasibility analysis. Evonik Industries (Germany) is the sole major industrial assignee directly engaged in plasma N-fixation process engineering in the dataset.

What are plasma-activated liquids (PAL) and how are they used in agriculture?

Plasma-activated liquids (PAL) are water or nutrient solutions treated by plasma jets or DBD discharges, which generate dissolved nitrate, nitrite, and ammonium through reactive nitrogen species transfer. These liquids can be applied directly to crops as liquid fertilizers. Research has demonstrated improved corn germination and growth (Kwangwoon University, 2021) and reduced algae contamination in hydroponic basil systems (North Carolina State University, 2023).

How does plasma nitrogen fixation differ from the Haber-Bosch process?

The Haber-Bosch process requires temperatures of 400–500 °C and pressures of 150–300 bar, making it energy-intensive and unsuitable for distributed deployment. Plasma-assisted nitrogen fixation operates at ambient or near-ambient conditions, can be powered by renewable electricity, starts and stops in seconds to accommodate intermittent power supply, and is suited to small-scale or off-grid production — capabilities the Haber-Bosch process cannot match.