Features of the synthesis of carbon nitride oxide (g-C3N4)O at urea pyrolysis

•First the new substance such as carbon nitride oxide was revealed at urea pyrolysis.•Carbon nitride oxide (g-C3N4)O is formed in a vapor gas reactionary space.•Resultant (g-C3N4)O is deposited outside of a place of precursor localization.•Carbon nitride oxide is reduced by a hydroquinone to reduced carbon nitride oxide.•Reduced carbon nitride oxide, probably, contains azagraphene sheets.

First from urea was synthesized carbon nitride oxide (g-C3N4)O which is formed in a vapor gas reactionary space and is deposited outside of a place of precursor localization. The reaction of urea conversion was investigated in an interval of temperatures 350–450 °С, but carbon nitride oxide is detected in the products of pyrolysis only at temperatures above 430 °С. Carbon nitride oxide is dissolved in water and at a reducing it by hydroquinone is formed reduced carbon nitride oxide consisting, as we believe, from azagraphene sheets.

Graphical abstractThe new substance such as carbon nitride oxide (g-C3N4)O is obtained at urea pyrolysis. First (g-C3N4)O was reduced by hydroquinone and reduced carbon nitride oxide probably contains azagraphene sheets.Figure optionsDownload full-size imageDownload as PowerPoint slide