SGCR based on the thermolysis of the stoichiometric mixture of metal salts with an organic a substance that acts as a complexing (chelating) agent in the sol-gel process and organic fuel in a combustion reaction. through allocating a large amount of gaseous products generated in conditions of low temperature combustion reaction between the metal nitrates, used as an oxidizing agent, and citric acid, used as a
a chelating agent, a reducing agent and fuel in the reaction system, It formed a very porous, like a sponge, connection