Binder-free macroporous high-silicon Na-type MOR zeolite molecular sieve and application thereof

Abstract

The invention relates to a binder-free macroporous high-silicon Na-type MOR zeolite molecular sieve. The skeleton structure of the binder-free macroporous high-silicon Na-type MOR zeolite molecular sieve is an elliptical oxygen twelve-membered ring main channel, the aperture size of a straight cylindrical channel formed by an oxygen twelve-membered rings is 0.695*0.581 nm, a silica-alumina molar ratio is greater than 15, benzene vapor adsorption capacity is greater than or equal to 80 mg / g, and a BET surface area is greater than or equal to 440 ml / g. The skeleton structure is stable, the effective aperture of macropores is obviously enlarged, and the practical performance of the molecular sieve is improved.

Description

technical field [0001] The invention relates to the field of structural chemistry, in particular to a binder-free macroporous high-silicon Na-type MOR zeolite molecular sieve and its application. Background technique [0002] MOR zeolite, also known as mordenite, is one of the earliest zeolites recognized by human beings. It is divided into two types: natural and synthetic. A zeolite discovered by How in 1864 was named as natural MOR zeolite for the first time. In 1948, Barre et al. used sodium carbonate as a mineralizer, silicic acid gel and sodium aluminate aqueous solution as raw materials to simulate a volcanic eruption environment, and synthesized MOR zeolite by hydrothermal crystallization at a temperature of 265°C to 295°C. [0003] When using organic templates to synthesize high-silicon MOR zeolites, the raw materials are expensive, the cost is high, the pollution is serious, and some organic bases are difficult to source. In addition, high-silicon MOR products syn...

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Problems solved by technology

[0003] When using organic templates to synthesize high-silicon MOR zeolite, the raw materials are expensive, the cost is high, the pollution is serious, and the source of some organic bases is difficult.

In addition, high-silicon MOR products synthesized using organic templates usually undergo high-temperature calcination to remove the template, resulting in stacking faults in the framework of the MOR zeolite, thereby reducing the effective pore size of the macropores and reducing the practical performance.

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