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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: The capability of the catalyst to perform a chemo- and enantioselective process while using simple ammonia gas as a reagent, one of the most attractive and industrially relevant nitrogen sources, is demonstrated.
Abstract: The asymmetric ruthenium-catalyzed reductive amination employing ammonia and hydrogen to primary amines is described. Here we demonstrate the capability of our catalyst to perform a chemo- and enantioselective process while using simple ammonia gas as a reagent, one of the most attractive and industrially relevant nitrogen sources. The presence of a catalytic amount of ammonium iodide was essential for obtaining good yields and enantioselectivities. The mechanism of this reaction was investigated by DFT and we found a viable pathway that also explains the trend and magnitude of enantioselectivity through the halide series in good agreement with the experimental data. The in-depth investigation of substrate conformers during the reaction turned out to be crucial in obtaining an accurate prediction of the enantioselectivity. Furthermore, we report the crystallographic data of the chiral [Ru(I)H(CO)((S,S)-f-binaphane)(PPh3)] complex, which we identified as the most efficient catalyst in our investigation.

99 citations

Journal ArticleDOI
TL;DR: The results demonstrate that polyacrylamide (PAM) has an insignificant effect on emission characteristics of nitrogen- and sulfur-containing odorous compounds, because the properties, sulfur and nitrogen speciations are similar in PAM-conditioned sludge and raw sludge (RS).

99 citations

Journal ArticleDOI
TL;DR: In this article, atmospheric pressure nonthermal plasma was used to synthesize ammonia from nitrogen and hydrogen over ruthenium catalysts Formation of NH3 in a N2-H2 mixture altered the plasma characteristics due to the low ionization potential of NH 3 (1015 eV).
Abstract: Atmospheric-pressure nonthermal plasma was used to synthesize ammonia from nitrogen and hydrogen over ruthenium catalysts Formation of NH3 in a N2-H2 mixture altered the plasma characteristics due to the low ionization potential of NH3 (1015 eV) The optimum gas ratio was found at N2:H2 = 4:1 by volume (ie, N2-rich conditions) When plasma was operated at a temperature below 250 °C, the NH3 concentration increased linearly with increasing specific input energy (SIE) For the Ru(2)-Mg(5)/γ-Al2O3 catalyst at 250 °C, pulse energization was four times more efficient than the AC energization case The presence of RuO2 was found to be beneficial for the NH3 synthesis via plasma-catalysis The addition of a small amount of O2 was found to be effective for the in situ regeneration of the deactivated catalyst The effect of metal promoters was in the order of Mg > K > Cs > no promoter

98 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the Catalytic Wet Air Oxidation (CWAO) process for ammonium ions removal from wastewater. And the greatest interest of CWAO compared to the classical biological one, is that the selectivity towards molecular nitrogen is much higher (>90%).

98 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