Attempts to synthesize the framework nitrogen bearing zeolites

The attempts to synthesize the nitrogen bearing zeolite analogs have been conducted under conditions resembling hydrothermal synthesis of zeolite with SiCl₄, AlCl₃, AlN, or metallic Al, and NaNH₂, as principal substrates. Ammonolysis of the substrates (mostly SiCl₄) was always the first step of synthesis and yielded the amorphous, porous products showing very high surface area and well ordered mesopore system. Their further treatment with NaNH₂ in liquid NH₃ or in other aprotic solvents (i.e., crystallization) usually did not lead to crystalline, porous materials, whereas the porosity of the products declined markedly. The crystalline products have been obtained by ammonolysis of Al₂(SiF₆)₃, but the product showed a low thermal stability.