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Preparation method and application of ammonium molybdate doped ZIF-67/chitosan composite catalyst

A technology of ZIF-67 and composite catalysts, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of easy changes in the surrounding chemical environment, poor water stability of MOFs, loss of stability of materials, etc. problem, to achieve the effect of increased ammonia activity, high production efficiency and high rate

Inactive Publication Date: 2019-10-25
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MOFs still generally have defects such as poor water stability and poor chemical stability. The easy change of the surrounding chemical environment of the metal / metal coordination center in the MOFs framework structure is the direct cause of the loss of stability of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 A kind of preparation method originating from ammonium molybdate doped ZIF-67 / chitosan composite catalyst

[0035] (1) Preparation of ammonium molybdate doped ZIF-67 / chitosan composite catalyst

[0036] Dissolve 1.8 g of chitosan in 92 mL of water and 2.8 mL of acetic acid with a mass fraction of 36%, add 3.3 g of cobalt nitrate hexahydrate, and stir to obtain a red gel;

[0037] 1.9 g NaOH, 2.4 g of 2-methylimidazole and 1.0 g of ammonium molybdate were dissolved in 35.4 mL of water to obtain 2-methylimidazole and ammonium molybdate and a mixed solution;

[0038]Inject 7.8 g of red gel into the mixture of 2-methylimidazole and ammonium molybdate with a needle with a diameter of 0.3 mm, and immediately form a blue ball with a diameter of 1.6 mm, 80 o C overnight, this mixed solution is filtered, and the solid obtained is washed 3 times with ethanol and water respectively, promptly makes ammonium molybdate doped ZIF-67 / chitosan composite material;

[0039]...

Embodiment 2

[0043] Embodiment 2 A kind of preparation method originating from ammonium molybdate doped ZIF-67 / chitosan composite catalyst

[0044] (1) Preparation of ammonium molybdate doped ZIF-67 / chitosan composite catalyst

[0045] Dissolve 2.0 g of chitosan in 94 mL of water and 3.0 mL of acetic acid with a mass fraction of 36%, add 3.5 g of cobalt nitrate hexahydrate, and stir to obtain a red gel;

[0046] 2.0 g NaOH, 2.6 g of 2-methylimidazole and 1.15 g of ammonium molybdate were dissolved in 35.4 mL of water to obtain 2-methylimidazole and ammonium molybdate and a mixed solution;

[0047] Inject 8.2 g of red gel into the mixture of 2-methylimidazole and ammonium molybdate with a needle with a diameter of 0.4 mm, and immediately form a blue ball with a diameter of 1.8 mm, 80 o C overnight, this mixed solution is filtered, and the solid obtained is washed 3 times with ethanol and water respectively, promptly makes ammonium molybdate doped ZIF-67 / chitosan composite material;

[004...

Embodiment 3

[0051] Embodiment 3 A kind of preparation method originating from ammonium molybdate doped ZIF-67 / chitosan composite catalyst

[0052] (1) Preparation of ammonium molybdate doped ZIF-67 / chitosan composite catalyst

[0053] Dissolve 2.2 g of chitosan in 98 mL of water and 3.4 mL of acetic acid with a mass fraction of 36%, add 3.8 g of cobalt nitrate hexahydrate, and stir to obtain a red gel;

[0054] 2.1 g NaOH, 2.8 g of 2-methylimidazole and 1.3 g of ammonium molybdate were dissolved in 35.4 mL of water to obtain 2-methylimidazole and ammonium molybdate and a mixed solution;

[0055] Inject 8.6 g of red gel into the mixture of 2-methylimidazole and ammonium molybdate with a needle with a diameter of 0.5 mm, and immediately form a blue ball with a diameter of 2 mm, 80 o C overnight, this mixed solution is filtered, and the solid obtained is washed 3 times with ethanol and water respectively, promptly makes ammonium molybdate doped ZIF-67 / chitosan composite material;

[0056] ...

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PUM

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Abstract

The invention discloses a preparation method and application of a molybdenum doped ZIF-67 / chitosan composite catalyst, and belongs to the technical field of metal organic complex nano materials and catalysis and the like. The preparation method includes the steps that the chitosan is mixed with cobalt nitrate hexahydrate and stirred into gel, and the gel is dropped into a mixed solution of ammonium molybdate and a dimethyl imidazole ligand by a needle to form pellets, and the pellets are activated in an oven, filtered, washed and calcined in an argon atmosphere to obtain the molybdenum doped ZIF-67 / chitosan composite catalyst. The preparation method has the advantages of low cost of raw materials, simple preparation process, low reaction energy consumption and industrial application prospect. The hybrid material is used for catalytic nitrogen fixation and has good electrocatalytic activity and electrochemical stability.

Description

technical field [0001] The invention relates to a preparation method and application of a ZIF-67 / chitosan composite catalyst derived from ammonium molybdate doping, and belongs to the technical fields of metal-organic complex polymers and catalysis. Background technique [0002] Ammonia is a vital chemical product in human society and is widely used in the production of fertilizers, pharmaceuticals, dyes, etc. At the same time, because of its strong hydrogen content and high energy density, it has also attracted extensive attention as an alternative energy carrier to promote the development of a low-carbon society. Therefore, N 2 and H 2 Catalytic synthesis of NH 3 It is considered to be one of "the most important chemical reactions on earth", and its inventors, F. Haber and C. Bosch, also deservedly won the Nobel Prize in Chemistry. This method is the famous "Haber-Bosch" method. However, the realization of industrial production of this reaction requires not only a hig...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B1/00C25B11/06
CPCB01J27/24C25B1/00C25B11/091B01J35/33
Inventor 童磊王志玲
Owner UNIV OF JINAN
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