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Ammonia

About: Ammonia is a research topic. Over the lifetime, 16217 publications have been published within this topic receiving 271940 citations. The topic is also known as: NH3 & azane.


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Journal ArticleDOI
TL;DR: In this paper, a kinetic model of the reacting aqueous chlorine-ammonia system is proposed which describes equally well the rapid "breakpoint" oxidation of ammonia, where the applied chlorine dose (CI 2 ) to ammonia-nitrogen molar ratio (Cl/N) is greater than approximately 1.6.
Abstract: A kinetic model of the reacting aqueous chlorine-ammonia system is proposed which describes equally well the rapid «breakpoint» oxidation of ammonia, where the applied chlorine dose (CI 2 ) to ammonia-nitrogen molar ratio (Cl/N) is greater than approximately 1.6; the slow oxidation of ammonia in aqueous chloramine solutions (Cl/N<1); and the transition region of 1

404 citations

Journal ArticleDOI
TL;DR: In this article, a selective and active nitrate reduction to ammonia on Fe single atom catalysts was reported, with a maximal ammonia Faradaic efficiency of 75% and a yield rate of up to 20,000μg/h−1 mgcat.−1 (0.46mol/m cm−2).
Abstract: Electrochemically converting nitrate, a widespread water pollutant, back to valuable ammonia is a green and delocalized route for ammonia synthesis, and can be an appealing and supplementary alternative to the Haber-Bosch process. However, as there are other nitrate reduction pathways present, selectively guiding the reaction pathway towards ammonia is currently challenged by the lack of efficient catalysts. Here we report a selective and active nitrate reduction to ammonia on Fe single atom catalyst, with a maximal ammonia Faradaic efficiency of ~ 75% and a yield rate of up to ~ 20,000 μg h−1 mgcat.−1 (0.46 mmol h−1 cm−2). Our Fe single atom catalyst can effectively prevent the N-N coupling step required for N2 due to the lack of neighboring metal sites, promoting ammonia product selectivity. Density functional theory calculations reveal the reaction mechanisms and the potential limiting steps for nitrate reduction on atomically dispersed Fe sites. Developing green and delocalized routes for ammonia synthesis is highly important but still very challenging. Here the authors report an efficient ammonia synthesis process via nitrate reduction to ammonia on Fe single atom catalyst.

401 citations

Journal ArticleDOI
TL;DR: Sulfide inhibition of NO- and N 2 O- reductases is proposed as being responsible for the driving part of the electron flow from S 2− to NH 4 + .

398 citations

Journal ArticleDOI
TL;DR: In this paper, the adsorption of nitric oxide, nitrogen dioxide and ammonia and their coadsorption on vanadia-titania have been studied by FT-IR spectroscopy.

397 citations

Journal ArticleDOI
TL;DR: The effect of ammonia concentration on the region of existence of single-phase water-in-oil microemulsions has been investigated for the system polyoxyethylene (5) nonylphenyl ether (NP-5)/cyclohexane/ammonium hydroxide and shows a complex dependence of the particle size on the water-to-surfactant molar ratio (R) and on the concentration of ammonium Hydroxide.

397 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,701
20223,035
2021425
2020443
2019496
2018511