Core-shell composite molecular sieve and application of core-shell composite molecular sieve to carbon dioxide separation

Abstract

A core-shell-structured composite molecular sieve material is formed in the way that based on the difference between the molecular kinetic diameters of carbon dioxide and nitrogen, through crystallization and ion exchange, a porous material which selectively allows carbon dioxide to penetrate but prevents other gases is built on the surface of a zeolite molecular sieve. Through building core-shell composite molecular sieve materials with different shell-layer thicknesses, and the shell-layer molecular sieve apertures are adjusted through ion exchange, while the excellent adsorption capacity of the original zeolite molecular sieve is maintained, the adsorption selectivity is carbon dioxide is improved.

Description

technical field

[0001] The invention relates to a core-shell compound molecular sieve material with adjustable structure, which has adsorption selectivity for carbon dioxide. Background technique

[0002] Carbon dioxide is the main greenhouse gas that affects climate change. A large amount of carbon dioxide emitted by industrial waste gas and vehicle exhaust will bring serious environmental problems. Carbon dioxide is not only a greenhouse gas, but also an important carbon resource. It is widely used in agriculture, light industry, machinery, chemical industry and other industries, so the capture and utilization of carbon dioxide has attracted widespread attention. For example, "Preparation Method and Application of a High-performance Carbonyl Carbon Dioxide Adsorbent Material" (CN105554850A) applied by Wang Baodeng in June 2016, by introducing strong metal cation doped carbon materials, an adsorbent material with good adsorption performance for carbon dioxide at low pressur...

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