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

A composite molecular sieve, core-shell type technology, applied in the field of core-shell type composite molecular sieve materials, can solve the problem of low carbon dioxide adsorption selectivity, achieve high selectivity, improve adsorption selectivity, and realize the effect of environmental purification

Active Publication Date: 2017-09-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, zeolite molecular sieves such as 13X and 5A are commercial carbon dioxide adsorbents with excellent performance. However, in practical applications, due to their high adsorption capacity for other gases such as nitrogen and water, the adsorption selectivity for carbon dioxide is low, and it has become an adsorption technology. The bottleneck of popularization and application

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1. Synthesis of 13X@NaA core-shell composite molecular sieve with crystallization time of 30 minutes

[0024] 13X was activated by heating at 500°C for 1 hour before use, and then activated by low-temperature plasma surface treatment for 10 minutes. Disperse 1 g of activated 13X powder in a certain amount of NaA precursor gel (1.9NaOH / 1.5NaAlO 2 / 3.5NaSiO 3 9H 2 O / 43H 2 O). Stir and mix well at 333K, transfer the mixture slurry to an autoclave and crystallize at 373K for 30 minutes. The sample was then filtered and washed 3 times with distilled water, dried at 383 K, and the obtained material was designated as 13X@NaA-30.

[0025] Such as figure 1 As shown, its scanning electron microscope picture shows that a stable core-shell structure 13X@NaA-30 has been generated

Embodiment 2

[0026] Example 2, Synthesis of 13X@NaA core-shell composite molecular sieve with crystallization time of 60 minutes

[0027] 13X was activated by heating at 500°C for 1 hour before use, and then activated by low-temperature plasma surface treatment for 10 minutes. Disperse 1 g of activated 13X powder in a certain amount of NaA precursor gel (1.9NaOH / 1.5NaAlO 2 / 3.5NaSiO 3 9H 2 O / 43H 2 O). Stir and mix well at 333K, transfer the mixture slurry to an autoclave and crystallize at 373K for 60 minutes. The sample was then filtered and washed 3 times with distilled water, dried at 383 K, and the obtained material was designated as 13X@NaA-60.

[0028] Such as figure 1 As shown, its scanning electron microscope picture shows that a stable core-shell structure 13X@NaA-60 has been generated

Embodiment 3

[0029] Example 3, Synthesis of 13X@NaA core-shell composite molecular sieve with crystallization time of 120 minutes

[0030] 13X was activated by heating at 500°C for 1 hour before use, and then activated by low-temperature plasma surface treatment for 10 minutes. Disperse 1 g of activated 13X powder in a certain amount of NaA precursor gel (1.9NaOH / 1.5NaAlO 2 / 3.5NaSiO 3 9H 2 O / 43H 2 O). Stir and mix well at 333K, transfer the mixture slurry to an autoclave and crystallize at 373K for 120 minutes. The sample was then filtered, washed 3 times with distilled water, and dried at 383 K, and the resulting material was designated as 13X@NaA-120.

[0031] Such as figure 1 As shown, its scanning electron microscope picture shows that a stable core-shell structure 13X@NaA-120 has been generated

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01D53/02
CPCB01D53/02B01D2253/108B01D2257/504B01D2258/01B01D2258/0283B01J20/186B01J2220/42B01J2220/4806Y02C20/40
Inventor 胡军黄佳丽水恒心金晴刘洪来
Owner EAST CHINA UNIV OF SCI & TECH
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