Topic
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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TL;DR: In this article, the selective catalytic reduction of nitrogen oxides has been studied in the presence of O2 over Fe/MFI catalysts with Fe/Al∼1, prepared by sublimation of FeCl3 vapor onto HMFI.
157 citations
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TL;DR: In this paper, the authors present 1 year of ambient ammonia (NH3), ammonium (NH4+), hydrochloric acid (HCl), chloride (Cl−), nitric acid (Cl), nitrate (NO3), nitrous acid(HONO), sulfur dioxide (SO2), and sulfate (SO42−) concentrations at three sites in the Coastal Plain region of North Carolina, located in counties with total NH3 emission densities of 4800, Kinston, and Morehead City.
157 citations
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TL;DR: In this paper, the use of a Microbial Electrolysis Cell (MEC) for ammonium removal, COD removal and hydrogen production from five times diluted urine was investigated.
157 citations
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TL;DR: In this paper, the relative humidity and pH dependence of the equilibrium product and the partial pressures are obtained from free energy thermodynamic data, showing that the ammonia-nitric acid equilibrium product is inversely related to relative humidity.
156 citations
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TL;DR: The kinetics of ammonia oxidation and the ability of a marine ammonia-oxidizing bacterium, Nitrosococcus oceanus, to metabolize methane were investigated in semicontinuous batch culture and inhibitors and coreactants were determined in order to elucidate the behavior of the ammonia oxygenase enzyme in N. oceanus.
Abstract: The kinetics of ammonia oxidation and the ability of a marine ammonia-oxidizing bacterium, Nitrosococcus oceanus, to metabolize methane were investigated in semicontinuous batch culture. The effects of inhibitors (acetylene and nitrapyrin) and coreactants were determined in order to elucidate the behavior of the ammonia oxygenase enzyme in N. oceanus. Acetylene and nitrapyrin were potent inhibitors and their effects were not mitigated by increased ammonia concentrations. Oxygen concentration had the effect of a mixed-type inhibitor; reduced oxygen inhibited the rate or ammonia oxidation at high substrate concentration but may enhance the rate at low substrate concentrations. Substrate affinity in terms of NH
4
+
increased (K
m decreased) with increasing pH. Optimal pH was about 8. Methane inhibited ammonia oxidation; the interaction was not simple competitive inhibition and the presence of multiple active sites on the enzyme was indicated by the behaviour of the inhibited treatments. Half-saturation constants for methane (K
i=6.6 μM) and ammonia (K
m=8.1 μM) were similar. N. oceanus oxidized methanol and methane linearly over time, with CO2 and cell material being produced at approximately equal rates.
155 citations