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

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

CN107185488AActive Publication Date: 2017-09-22EAST CHINA UNIV OF SCI & TECH
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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
Comparison scheme
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

Patent Timeline
22 Sep 2017
Publication
CN107185488A
IPC
B01J20/18; B01D53/02
CPC
B01D53/02; B01D2253/108; B01D2257/504; B01D2258/01; B01D2258/0283; B01J20/186; B01J2220/42; B01J2220/4806
Inventors
胡军; 黄佳丽