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 paper, an ammonia dissociation catalyst coated with 2% ruthenium on 3.175mm alumina pellets was used to analyze the effect of the catalyst as an ammonia cracker to decompose ammonia into hydrogen and nitrogen.
87 citations
TL;DR: In this article, the reduction of nitrate and nitrite ions was studied in 1m NaOH supporting electrolyte, and it was shown that on silver cathodes, nitrate reduction begins at potentials about 500 mV more positive than nitrite reduction, the latter being superimposed on hydrogen evolution.
Abstract: The reduction of nitrate and nitrite ions was studied in 1m NaOH supporting electrolyte. Voltammetric investigations show that, on silver cathodes, nitrate reduction begins at potentials about 500 mV more positive than nitrite reduction, the latter being superimposed on hydrogen evolution. Electrolyses of nitrate solutions at −1.4V/sce give nitrite with good selectivity. On copper cathodes, nitrate and nitrite reductions occur in the same region of potentials and show similar voltammetric profiles. The dominant product of nitrite reduction is ammonia, whereas nitrate may be reduced to nitrite at −1.1 V/sce and to ammonia with high yields at −1.4 V/sce. Reduction of nitrogen oxyanions may also be performed on CuInSe2 (photo)cathodes. Photoassisted reductions of nitrate performed on p-CuInSe2 at −1.4 V/sce gave mixtures of ammonia, nitrite and hydrogen.
87 citations
TL;DR: This study evaluated the use of zeolites as a post-treatment step, an alternative to the biological removal process, to remove low levels of ammonium from treated wastewater using batch and fixed bed columns.
87 citations
01 Jun 1992
TL;DR: In this paper, the authors investigated the ammonia losses following surface applications of urea to trash covered sugar cane fields in four climatic zones of tropical Queensland and found that the pattern, rate and extent of ammonia loss were controlled by the availability of water in the trash and its evaporation.
Abstract: Ammonia losses following surface applications of urea to trash covered sugar cane fields were investigated in four climatic zones of tropical Queensland. Volatilization of ammonia and evaporation of water were determined by micrometeorological techniques. The results showed that the pattern, rate and extent of ammonia loss were controlled by the availability of water in the trash and its evaporation. Water added by dewfall, rainfall or condensation of evaporated soil moisture dissolved some of the urea and allowed it to be hydrolyzed to ammonia by the urease enzyme in the sugarcane residues; when the water evaporated, ammonia was lost to the atmosphere.
86 citations
TL;DR: In this paper, measurements of nitric acid, ammonia and related particulate matter were made at a coastal site in Greece to elucidate the local factors that affect the concentrations of each of these species, as well as the atmospheric transport of particulate sulfate.
86 citations