Preparation method and application of novel sub-mesoporous zeolite molecular sieve adsorbent

Abstract

The invention relates to a preparation method of a novel sub-mesoporous zeolite molecular sieve adsorbent. The preparation method comprises the following steps: step 1, preparing the sub-mesoporous zeolite molecular sieve adsorbent from natural stilbite mineral powder through structural stabilization modification; and 2, partially replacing calcium ions in the mineral powder obtained by mechanically crushing the natural stilbite through multiple times of cation exchange of a salt or dilute mineral acid aqueous solution, and heating to 350-600 DEG C for 1-2 hours to prepare the sub-mesoporous zeolite molecular sieve adsorbent. In the step 1, the natural stilbite is subjected to structure stabilization modification, so that the natural stilbite has relatively high methane adsorption capacityand nitrogen adsorption selectivity which are rarely possessed by zeolite molecular sieves with other structure types, and the natural stilbite is subjected to adsorption separation of small molecular gas or organic matters and removal of toxic and harmful molecules; the method has important industrial application prospects in the fields of chemical engineering and environmental protection such as concentration and enrichment of methane in coalbed methane and oilfield gas.

Description

technical field [0001] The invention relates to the technical field of zeolite molecular sieve adsorbent, in particular to a preparation method and application of a novel sub-medium pore zeolite molecular sieve adsorbent. Background technique [0002] Zeolite adsorbent is a fine chemical widely used in industry and daily life. It is often used in drying dehydrating agent, adsorption of gas and organic molecules, separation of isomer molecules, ion exchange, etc. The zeolite molecular sieve adsorbent is widely used and has a huge market demand. It is expected that the global annual demand will exceed 2 million tons in 2023. Zeolite molecular sieves are divided according to their pore size and framework silicon-aluminum molar ratio SAR and pore size range. Common industrial adsorbents can be roughly divided into low-silicon small-pore zeolites such as LTA-type zeolite, referred to as A zeolite, and low-silicon large-pore zeolites such as FAU-type zeolite. Referred to as X zeo...

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Problems solved by technology

[0006] For this reason, the present invention provides a preparation method and application of a novel sub-medium pore zeolite molecular sieve adsorbent to overcome the problems in the prior art that require a preparation method and application of a zeolite molecular sieve with a small pore size and moderate hydrophobicity.

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