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Metal organic framework/halide composite ammonia adsorbent and preparation method thereof

A metal-organic framework, halide technology, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve the problems of low ammonia adsorption, poor heat and mass transfer capabilities, etc., to improve ammonia absorption performance, alleviate Adsorption hysteresis, excellent and reliable performance

Active Publication Date: 2021-06-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a method for preparing a metal-organic framework / halide composite ammonia adsorbent to solve the problem of the low proportion of impregnated salt and the low ammonia adsorption capacity and accumulation of the traditional mixed ammonia adsorbent with expanded graphite as the matrix. Problems such as poor heat and mass transfer capacity in the state

Method used

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  • Metal organic framework/halide composite ammonia adsorbent and preparation method thereof
  • Metal organic framework/halide composite ammonia adsorbent and preparation method thereof
  • Metal organic framework/halide composite ammonia adsorbent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0040] Example 1 Performance testing of different metal organic frameworks and halides alone as ammonia adsorbents

[0041] 1) The present embodiment provides a kind of preparation method of MIL-101 (Cr) ammonia adsorbent, the steps are as follows:

[0042] Add 10mmol Cr(NO 3 ) 3 9H 2 O and 10 mmol H 2 BDC. Then 0.58ml of glacial acetic acid was added. After sonicating for 30 min at room temperature, the mixture was transferred to an autoclave and heated at a temperature of 220 °C for 8 h. After cooling to room temperature, the green solid was successively washed with deionized water, DMF and ethanol. Finally, the obtained solid was vacuum-dried at 150° C. for 12 h to obtain MIL-101 (Cr) ammonia adsorbent.

[0043]2) The present embodiment provides a kind of preparation method of ZIF-8(Zn) ammonia adsorbent, the steps are as follows:

[0044] 16.53 mmol of Hmim was dissolved in 50 mL of methanol to obtain solution A1. In addition, 4.13mmol Zn(NO 3 ) 2 ·6H 2 O was d...

Embodiment 2

[0056] This example provides a method for preparing a metal-organic framework / halide composite ammonia adsorbent, the steps are as follows:

[0057] First weigh a certain proportion of calcium chloride (prepared by the method of step 5 of Example 1), pour into a certain amount of deionized water for dissolving respectively, and prepare a 25% calcium chloride aqueous solution for subsequent use. Then weigh a certain amount of MIL-101 (Cr) (prepared by the step 1) method of embodiment 1), the preparation concentration is 10mg / ml, and obtain well-dispersed MIL-101 (Cr) after fully processing with an ultrasonic disperser ) suspension for later use.

[0058] Next, add the prepared calcium chloride aqueous solution into the well-dispersed MIL-101(Cr) suspension to obtain a mixture of the calcium chloride solution and the MIL-101(Cr) suspension.

[0059] Again, fully stir for 12 hours by a magnetic stirrer, and completely impregnate calcium chloride into the micropores of MIL-101 (C...

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Abstract

The invention relates to a metal organic framework / halide composite ammonia adsorbent and a preparation method thereof, and belongs to the technical field of new energy materials. The metal organic framework / halide compound ammonia adsorbent is prepared from a preferred metal organic framework and a preferred halide through a solution permeation recrystallization method, and the preferred metal organic framework suspension concentration and the preferred halide solution concentration are adopted; the halide is uniformly adsorbed on the surface of the metal organic framework and in a pore structure, and in the ammonia adsorption / desorption process, the metal organic framework / halide compound ammonia adsorbent captures ammonia at the same time to generate physical-chemical coupling adsorption so as to realize efficient heat storage and refrigeration performance. The metal organic framework / halide compound ammonia adsorbent can effectively solve the problems that a traditional graphite-based compound ammonia adsorbent is low in dipping salt proportion and adsorption capacity, poor in heat and mass transfer capacity in a stacking state and the like, and the metal organic framework / halide compound ammonia adsorbent is applied to an adsorption type refrigeration and heat storage system for the first time; and the performances of high halide impregnation amount, ammonia adsorption amount, heat and mass transfer and the like can be realized.

Description

technical field [0001] The invention relates to a metal organic framework / halide composite ammonia adsorbent and a preparation method thereof, belonging to the technical field of new energy materials. Background technique [0002] Adsorption refrigeration or heat storage technology is a high-efficiency energy-saving technology driven by medium and low temperature heat sources such as solar energy or industrial waste heat. It often uses ammonia as a circulating working medium and is prepared as an environmentally friendly refrigeration and heat storage method that does not produce greenhouse effects and ozone holes. attention. Compared with vapor compression systems, adsorption refrigeration or heat storage systems have the advantages of simple structure, no noise, long service life, and low investment and operation costs. [0003] At present, the use of halides to form complexes to adsorb ammonia has the advantages of non-toxic and harmless, large ammonia adsorption capacit...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30B01D53/02B01D53/58B01D53/81
CPCB01J20/226B01J20/046B01J20/0288B01J20/0222B01J20/0259B01D53/02B01D53/58B01D53/81Y02A50/20
Inventor 王丽伟吴韶飞安国亮李松夏潇潇刘治鲁张宸
Owner SHANGHAI JIAO TONG UNIV
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