Near-neutral zeolite molecular sieve as well as preparation method and application thereof

Abstract

The invention discloses a near-neutral zeolite molecular sieve as well as a preparation method and application thereof. The method comprises the following steps: (1) dissolving a common zeolite molecular sieve into water to form slurry; (2) adding concentrated acid into water to prepare a solution with a corresponding pH value; (3) slowly adding a certain volume of acid into the slurry, stirring and dispersing, and then continuously stirring for a certain period of time; (4) after stirring is finished, washing and drying to obtain the near-neutral zeolite molecular sieve. The preparation method provided by the invention can prepare the near-neutral zeolite molecular sieve simply and quickly without destroying the performance of the molecular sieve, and can realize the controllability of the alkalinity after the modification of the ordinary molecular sieve, so that the modified molecular sieve can be better applied to the application fields such as absorption, drying, separation, catalysis and ion exchange in a near-neutral environment; the near-neutral zeolite molecular sieve can also be used as a good carrier for alkaline environment sensitive catalysts, is successfully applied tothe drying of electrolyte of lithium ion batteries, and improves electrochemical performance.

Description

technical field [0001] The invention relates to the modification of crystalline silicate materials, in particular to a near-neutral zeolite molecular sieve and its preparation method and application. Background technique [0002] The traditional molecular sieve is a crystalline aluminosilicate material containing Na and having a spatial network structure, mainly including type A or type X, which are synthesized in a relatively strong alkaline environment, making the surface of the molecular sieve overall alkaline; at the same time, In the silicon aluminum molecular sieve, because the aluminum atom is trivalent, so in AlO 4 The valence electrons of a skeleton oxygen atom in the tetrahedron are not neutralized so that the entire AlO 4 The tetrahedron has a partial negative charge, which is usually compensated by alkali metals or alkaline earth metals, but the binding ability of these cations to the silicon-aluminum molecular sieve is very weak, which will also make the molecu...

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Problems solved by technology

[0002] The traditional molecular sieve is a crystalline aluminosilicate material containing Na and having a spatial network structure, mainly including type A or type X, which are synthesized in a relatively strong alkaline environment, making the surface of the molecular sieve overall alkaline; at the same time, In the silicon-alumina molecular sieve, since the aluminum atom is trivalent, so in AlO 4 The valence electrons of a skeleton oxygen atom in the tetrahedron are not neutralized so that the entire AlO 4 The tetrahedron has a partial negative charge, which is usually compensated by alkali metal or alkaline earth metal, but the binding ability of these cations to the silicon-aluminum molecular sieve is very weak, which will also make the molecular sieve alkaline

Although molecular sieves have a wide range of applications in selective adsorption, catalysis, loading carriers, drying and heavy metal treatment, but due to the high alkalinity of molecular sieves, there are certain restrictions on the use environment, so the preparation of near-neutral zeolites Molecular sieve is very necessary