Preparation method of rare earth metal Nd doped H-ZSM-34 molecular sieve

Abstract

The invention discloses a preparation method of a rare earth metal Nd doped H-ZSM-34 molecular sieve, the preparation method comprises the following steps of: adding an aluminum source into water, continuously adding an alkali source and a silicon source, stirring and aging to obtain a clear seed crystal solution; sequentially adding sodium hydroxide and water-soluble silica gel into an aqueous solution, stirring, then sequentially adding aluminum sulfate crystals and the seed solution to obtain a precursor solution; adding a Nd(NO3)3.6H2O solid in the precursor solution, stirring at room temperature, putting the mixture into a kettle, crystallizing, taking out of the kettle, filtering by suction, washing, drying and roasting in air to obtain Nd-doped Na-ZSM-34; adding the Nd-doped Na-ZSM-34into an ammonium nitrate solution, stirring, filtering by suction, washing and drying; and repeating ammonium exchange four times to obtain NH4-ZSM-34, and roasting the NH4-ZSM-34 in the air to obtain the rare earth metal Nd doped H-ZSM-34 molecular sieve. The rare earth metal Nd doped H-ZSM-34 molecular sieve prepared by the method has the advantages of unique pore structure, suitable acidity,good stability, larger specific surface area and the like.

Description

technical field [0001] The invention belongs to the technical field of synthesis of H-ZSM-34 molecular sieves, and in particular relates to a preparation method of rare-earth metal Nd-doped H-ZSM-34 molecular sieves. Background technique [0002] Propylene can be used to produce important chemical products such as polypropylene, propylene oxide, acetone, isopropanol, phenol, glycerin, etc. It is an indispensable chemical production raw material for the development of modern society and economy. Therefore, there is a need to develop an efficient method for producing propylene. [0003] At present, the production route of preparing propylene from methyl halide is mature, and the reaction of preparing propylene from methyl halide requires a molecular sieve catalyst. Although this method improves the yield of propylene, it is prone to loss due to the pore structure and acidity of the molecular sieve catalyst. Therefore, it is particularly important to prepare molecular sieve ca...

AI Technical Summary

Problems solved by technology

[0002] Propylene can be used to produce important chemical products such as polypropylene, propylene oxide, acetone, isopropanol, phenol, glycerin, etc. It is an indispensable chemical production raw material for the development of modern society and economy. Therefore, there is a need to develop efficient methods for the production of propylene

[0003] At present, the production route of producing propylene from methyl halide is mature, and the reaction of preparing propylene from methyl halide requires a molecular sieve catalyst. Although this method improves the yield of propylene, it is prone to loss due to the pore structure and acidity of the molecular sieve catalyst. Therefore, it is particularly important to prepare molecular sieve catalysts with long catalytic life, good stability and high catalytic performance.