The best catalyst was likewise very active for the oxidation of the most refractory sulfur compounds as benzothiophene and 4,6-dimetyldibenzothiopene.
In real JP-8 fuel, 2,3-dimethylbenzothiophene was found to be the most refractory sulfur compound to be oxidized.
Hafnium carbide is the most refractory binary compound known, with a melting point over 3890 °C, and hafnium nitride is the most refractory of all known metal nitrides, with a melting point of 3310 °C.
GC MS analysis indicated the MCO eliminated most bio-refractory compounds and improved the BOD5/COD from 0.08 to 0.48.
Moreover, the prepared catalysts showed superior stability and most of toxic and refractory compounds were eliminated at successive catalytic ozonation runs.
Ammonia, a well-known by-product of chemical, fertiliser and metallurgy industries, is also the most refractory product of nitrogen-containing compound oxidation.
Most of these physicochemical processes removed the majority of the colloidal organic substances and suspended materials; however, refractory compounds still remained in the water effluent.
Both uranium and plutonium nitrides are brittle, refractory compounds that melt at temperatures generally above 2,000° C (3,600° F).
Refractory compounds in leachate always change over times due to overwhelmed mankind activities.
Cast SHS powders are obtained by mechanical grinding and dispersion of ingots of refractory compounds and corundum or heterogeneous systems consisting of two or more refractory compounds.
