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Method for synthesizing Cu-ZIF-67 by doping copper into zeolite-imidazolium framework

A zeolite imidazolium salt, cu-zif-67 technology, applied in the field of ZIF-67 synthesis, can solve problems such as low gas separation performance, affecting gas molecule transport, etc., achieve excellent thermal stability, reduce pollution, and reduce production costs. Effect

Inactive Publication Date: 2018-04-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the presence of different gases, the transition metal center and the organic linker rotate differently on the bonding axis, which affects the transport of gas molecules in the ZIF crystal and leads to lower gas separation performance than expected based on the static crystal structure.

Method used

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  • Method for synthesizing Cu-ZIF-67 by doping copper into zeolite-imidazolium framework
  • Method for synthesizing Cu-ZIF-67 by doping copper into zeolite-imidazolium framework
  • Method for synthesizing Cu-ZIF-67 by doping copper into zeolite-imidazolium framework

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment one: the Cu(NO of 0.51g 3 ) 2 ·3H 2 O and 0.95g of Co(NO 3 ) 2 ·6H 2 O mixed, added 8ml deionized water, stirred and dissolved to obtain mixed solution A. Mix 23.22g of 2-methylimidazole (HmIm) and 80ml of deionized water, and continue stirring to dissolve to obtain mixed solution B. The mixed solution A and the mixed solution B were mixed and stirred for 60 minutes to obtain a homogeneous gel, and the homogeneous gel was centrifuged to separate the mother liquor, wherein the rotation speed was 7000 rpm, and the centrifugation time was 60 minutes. The solid sample collected after centrifugation was washed with deionized water, and then heated in an oven at 100°C for 12h, and the final product was Cu5-ZIF-67, figure 1 is the XRD pattern of the Cu5-ZIF-67.

Embodiment 2

[0027] Embodiment two: the Cu(NO of 0.15g 3 ) 2 ·3H 2 O and 0.95g of Co(NO 3 ) 2 ·6H 2 O mixed, added 8ml deionized water, stirred and dissolved to obtain mixed solution A. 11.62 g of 2-methylimidazole (HmIm) and 40 ml of deionized water were mixed and continuously stirred to dissolve to obtain a mixed solution B. The mixed solution A and the mixed solution B were mixed and stirred for 60 minutes to obtain a homogeneous gel, and the homogeneous gel was centrifuged to separate the mother liquor, wherein the rotation speed was 9000 rpm, and the centrifugation time was 80 minutes. The solid sample collected after centrifugation was washed with deionized water, and then heated in an oven at 100°C for 24h, and the final product was Cu15-ZIF-67, figure 2 is the XRD pattern of the Cu15-ZIF-67.

Embodiment 3

[0028] Embodiment three: the Cu(NO of 0.15g 3 ) 2 ·3H 2 O and 0.95g of Co(NO 3 ) 2 ·6H 2 O mixed, added 4ml deionized water, stirred and dissolved to obtain mixed solution A. Mix 23.22g of 2-methylimidazole (HmIm) with 70ml of deionized water, and continue stirring to dissolve to obtain mixed solution B. The mixed solution A and the mixed solution B were mixed and stirred for 5 minutes to obtain a homogeneous gel, and the homogeneous gel was centrifuged to separate the mother liquor, wherein the rotation speed was 12000 rpm, and the centrifugation time was 70 minutes. The solid sample collected after centrifugation was washed with deionized water, and then heated in an oven at 100°C for 12h, and the final product was Cu15-ZIF-67, image 3 is the XRD pattern of the Cu15-ZIF-67. Because the mixing and stirring time of the solution of this embodiment is shorter, the output of synthesis is less.

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Abstract

The invention discloses a method for synthesizing Cu-ZIF-67 by doping copper into a zeolite-imidazolium framework. The method comprises the steps: firstly, preparing a copper-cobalt solution, whereinthe mole ratio of cobalt / copper is 1.5 to 8.5; mixing the copper-cobalt solution with a 2-methylimidazole solution with the molar concentration of 3.5mol / L to 5mol / L, and carrying out stirring continuously until homogeneous gel is obtained, wherein the mole ratio of 2-methylimidazole / copper-cobalt is 30 to 45; and subjecting the stirred homogeneous gel to centrifugation to remove a mother liquid,collecting a solid sample, washing the solid sample with deionized water, and finally, drying the solid sample in a baking oven at the temperature of 100 DEG C, so as to obtain the product, i.e., Cu-ZIF-67 finally. The copper can be used for improving the thermal stability of ZIF-67 without changing the structure and carbon dioxide capacity of the ZIF-67. Compared with traditional ZIF-67 synthesisprocesses, the method disclosed by the invention is simpler, more convenient and quicker, deionized water serves as a working medium, is cheap and readily available and is light in environmental pollution, both a used metal source and an organic source are cheap and readily available products, and thus, the production cost is reduced remarkably.

Description

technical field [0001] The invention belongs to the field of carbon dioxide adsorption (microporous material preparation method), in particular to a synthesis method of ZIF-67. Background technique [0002] China's rapid economic growth and industrialization have resulted in a substantial increase in carbon dioxide emissions, and China has now become the world's largest carbon dioxide emitter. Among them, coal-fired power plants produce carbon dioxide emissions accounted for 83% of the entire power system carbon dioxide emissions, because carbon dioxide is the main cause of the greenhouse effect, the control of carbon dioxide emissions has become a crucial issue. Carbon dioxide capture and storage (CCS) is the only way the world can continue to use coal while reducing carbon dioxide emissions from coal combustion. [0003] Zeolite imidazolate framework (ZIF) material is a metal-organic framework (MOF) material for gas separation. ZIF is tetrahedrally arranged and connected ...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30B01D53/02
CPCB01D53/02B01D2256/18B01D2257/504B01J20/226Y02C20/40
Inventor 刘庆岭帝汉尼郭铭玉韩金峰吕双春宋春风
Owner TIANJIN UNIV
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