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: Threonine, proline, and glycine can be used to mitigate some of the toxic effects of ammonium on cell growth, recombinant protein productivity, and protein quality.
103 citations
TL;DR: In this article, the BPL carbon samples impregnated with chlorides of copper, nickel, and zinc were used as ammonia adsorbents in dynamic conditions with various amounts of water present in the systems.
Abstract: The BPL carbon samples impregnated with chlorides of copper, nickel, and zinc were used as ammonia adsorbents in dynamic conditions with various amounts of water present in the systems. The initial and exhausted samples were characterized using adsorption of nitrogen, XRF, XRD, FTIR, SEM, and thermal analysis. The results indicate that metal chlorides are active centers for ammonia adsorption via formation of complexes. Water enhances the amount of ammonia adsorbed, promoting its dissolving into the film of water adsorbed in micropores and formation of NH4+ ions. Even though the pore system of activated carbon provides spaces for dispersion of metals, it still contributes significantly to the amount of ammonia adsorbed (about 80%) via dispersive forces. The most efficient adsorbent for ammonia removal is the carbon impregnated with copper. In this material the efficiency is governed by the amount of copper introduced to the carbon and its dispersion on the surface.
103 citations
TL;DR: Ammonia volatilisation from various nitrogenous (N) fertilisers broadcast at different times of year on to pasture at a rate of 3 g/m2 N (30 kg/ha N) was measured by an enclosure method as discussed by the authors.
Abstract: Ammonia (NH3) volatilisation from various nitrogenous (N) fertilisers broadcast at different times of year on to pasture at a rate of 3 g/m2 N (30 kg/ha N) was measured by an enclosure method. The average percent losses of NH3-N were: urea, 11.9; diammonium phosphate, 5.3; ammonium sulphate, 1.0; and calcium ammonium nitrate, 0.8. Loss from sulphur-impregnated urea was equal to, or slightly less than that from urea. The loss was positively related to the maximum soil surface pH produced by each of the fertilisers. No seasonal pattern was observed, except that NH3 loss tended to be lower in August–September. The loss from urea increased from 13 to 33% of N applied as the application rate increased from 3 to 20 g/m2 N (30–200 kg/ha N).
103 citations
TL;DR: In this article, the selective catalytic oxidation of ammonia to nitrogen (NH 3 -SCO) has been studied over hydrotalcite derived mixed metal oxides containing Cu, Co, Fe or Ni.
Abstract: The selective catalytic oxidation of ammonia to nitrogen (NH 3 -SCO) has been studied over hydrotalcite derived mixed metal oxides containing Cu, Co, Fe or Ni. XRD, BET, NH 3 -TPD and TPR techniques were used for catalysts characterization. Results of NH 3 -SCO were compared with those of selective catalytic reduction of NO with NH 3 (NO-SCR). Reaction mechanism was studied by temperature-programmed surface reaction (TPSR) and activity tests with a various contact time. Catalytic performance of the studied samples depends on both kind and loading of transition metals in the mixed metal oxide system. The Cu-containing samples have been found to be the most active catalysts of the NH 3 -SCO process. Transition metal loading strongly influences distribution of ammonia oxidation products. The highest selectivity to N 2 was measured for the catalysts with the lowest transition metal content.
103 citations
TL;DR: The results demonstrate that ammonia can be extracted via electrochemical means at reasonable energy inputs of approximately 12 kWh kg(-1) N and critical for further development will be the inclusion of a passive means for ammonia stripping to reduce additional energy inputs.
102 citations