Included in the Lewis definition of acids are the metal ions; the oxides of certain nonmetallic elements, such as sulfur, phosphorus, and nitrogen; substances able to donate hydrogen ions or protons; and certain solid compounds, such as aluminum chloride, boron trifluoride, silica, and alumina.
The process involves preliminarily dispersing an organo-nitrogen substance onto the oxide catalyst, introducing elemental sulfur together with an organic solvent, and a subsequent multi-step heat treatment.
XRD analysis indicates that the organo-nitrogen substance facilitates metal oxy-sulfide to disperse uniformly on γ-Al2O3 and the resulting metal oxy-sulfide species turn to be rather structurally amorphous.
Within this study, the influence of the nitrogen content as one of the most important buffering substances on the performance of the system has been tested.
Phenol, aniline, chlorine- and nitrogen containing substances in model solutions, real wastewater of the alcohol plant (oxygen-containing compounds) and petrochemical plant (sulfurous substances) were used in our experiments.
Once established, after being nurtured on a broth of yeast, minerals and urea – the main nitrogen-containing substance in mammals' urine, they get to work producing calcite which plugs concrete cracks.
In a symbiotic partnership the plant then provides the bacteria in the nodules with shelter, oxygen, and food, and in return the bacteria fix atmospheric nitrogen into substances that the plant needs for growth.
N-doped highly dense uniform carbon microspheres of around 1 μm have been prepared by a nanocasting strategy using silica particles as template and a nitrogen-rich substance (i.e. pyrrole) as carbon precursor.
Many nitrogen containing substances like various amines were identified that significantly induce TRI5 expression [ 17].
