A preparation method of modified heu-type zeolite and its application as nitrogen selective adsorbent

Abstract

The invention introduces a preparation method of modified HEU type zeolite and an application of the modified HEU type zeolite as a nitrogen selection adsorbent. The preparation method comprises the following steps of uniformly mixing SiO2 with Al2O3, Na2O, K2O and H2O according to the mole ratio of the SiO2 to the Al2O3, to the Na2O, to the K2O and to the H2O being (8-20) to 1 to (0.5-3) to (0.5-3) to (300-800) to obtain initial aluminosilicate sol, then adding artificial synthesis structure induction species of which the mass percentage is about 1-20%, performing low-temperature ageing, performing high-temperature crystallization, performing solid-liquid separation, and performing drying so as to obtain high-crystallinity HEU type zeolite. According to the preparation method disclosed by the invention, the crystallization period can be greatly shortened and can be shortened to 12h, and besides, the synthesized HEU type zeolite can be guaranteed to have small and uniform grain size (1-3[mu]m); and after ion exchange modification, different ion exchange modified adsorbents can be obtained, and the selective adsorption capacity of the adsorbents to N2 in N2 / CH4 mixed gas is obviously improved and can be improved by 2-15 times.

Description

A kind of preparation method of modified HEU type zeolite and its application as nitrogen selective adsorbent technical field The invention relates to a technology in the field of chemical adsorbents, in particular to a preparation method of a modified HEU type zeolite and its application as a nitrogen selective adsorbent. Background technique Natural clinoptilolite with HEU-type framework structure is the most widely existing zeolite molecular sieve in nature. There are two kinds of HEU-type structure zeolite materials: heulandite and clinoptilolite. Natural clinoptilolite can be used as a gas adsorbent in industry, and its cation composition and quantity can be changed by ion exchange technology, so as to realize artificial regulation of natural clinoptilolite's selective adsorption performance. Natural clinoptilolite can be widely used in the field of water treatment to remove impurities such as heavy metal ions and ammonia nitrogen in wastewater. However, due to the...

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Problems solved by technology

The technical problem to be solved by the present invention is to provide a preparation method of modified HEU-type zeolite and its application as a nitrogen selective adsorbent, so as to solve the technical problems of artificially synthesized HEU-type zeolite with long synthesis period and poor repeatability

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