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Modified metal-organic framework porous adsorption material and its adsorption working fluid pair

A metal-organic framework, porous adsorption material technology, used in heat exchange materials, other chemical processes, chemical instruments and methods, etc., can solve the problems of limiting evaporation temperature, large volume, etc., to achieve wide sources, large specific surface area, refrigeration. The effect of improved performance

Inactive Publication Date: 2011-12-14
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, under low pressure, the amount of water adsorbed on silica gel is small, which limits the evaporation temperature of silica gel-water adsorption refrigeration, which is also the reason for the large volume of most silica gel-water refrigeration units on the market.

Method used

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  • Modified metal-organic framework porous adsorption material and its adsorption working fluid pair
  • Modified metal-organic framework porous adsorption material and its adsorption working fluid pair
  • Modified metal-organic framework porous adsorption material and its adsorption working fluid pair

Examples

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Effect test

Embodiment example 1

[0027] Indium nitrate dihydrate and imidazole 4,5-dicarboxylate were dissolved in N,N-dimethylformamide in a ratio of (1:2), mixed evenly and poured into a polytetrafluoroethylene reactor, the reaction temperature was 85°C , the reaction time is 24h, and the three-dimensional cage-like network skeleton structure adsorbent is formed by complexing through the hydrothermal synthesis method. It forms an adsorption working medium pair with water, and at 25°C and 0.1MPa, the refrigerating capacity per unit mass of the adsorbent can reach 1187.74KJ / kg; The capacity can reach 423.17KJ / kg; when it forms an adsorption working medium pair with ethanol, at 25°C and 0.1MPa, the refrigerating capacity per unit mass of the adsorbent can reach 323.33KJ / kg. The adsorbent cage skeleton described in the implementation case 1 is composed of dodecahedral MBB (InN 4 (CO 2 ) 4 ) form, each indium atom and four H 3 Four nitrogen atoms and four oxygen atoms are connected in the ImDC ligand. The t...

Embodiment example 2

[0029] Nickel nitrate, benzene tricarboxylate and 1,2-bis(1,2,4-triazol-4-yl)ethane were dissolved in N,N-dimethylformaldehyde in the ratio of (1:1:3) In the amide, stirring at 25°C for 60 minutes, reaction temperature at 250°C, and reaction time of 24 hours, complexation by hydrothermal synthesis to form a three-dimensional skeleton structure. It forms a working medium pair with water, and under typical air-conditioning conditions (evaporation temperature 10°C), the refrigerating capacity per unit mass of the adsorbent reaches 518.28KJ / kg. The three-dimensional network structure of the adsorbent described in Example 2 is composed of benzenetricarboxylic acid, 1,2-bis(1,2,4-triazol-4-yl, nickel atoms, oxygen atoms and the like.

Embodiment example 3

[0031] Zinc nitrate and benzene tribenzoate were dissolved in N,N-diethylformamide in a ratio of (4:5), stirred at 25°C for 10 minutes, the reaction temperature was 80°C, and the reaction time was 72 hours, and synthesized by hydrothermal complexation to form a three-dimensional framework. It forms an adsorption working pair with ammonia, and at 25°C and 0.1MPa, the refrigerating capacity per unit mass of the adsorbent can reach 283.72KJ / kg. In the implementation case 3, the network skeleton structure of the adsorbent is composed of a benzenetribenzoic acid unit and 3 Zn 4 O phase connection, Zn 4 Structural fragments on O include hexacyclic rings and zinc atoms. The adsorbent has a network structure of (6,3) coordination, the octahedron in the figure has 6 coordination points, and the center is a benzenetricarboxylic acid unit with three coordination points. The three-dimensional network framework structure and XRD pattern of the adsorbent are shown in figure 2 and ima...

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Abstract

The invention relates to a modified metal organic frame porous adsorption material in an adsorption refrigeration system. The modified metal organic frame porous adsorption material provided by the invention is prepared through steps that: metal ion nitrate and organic ligand are formulated according to a molar ratio of 1:1-10; the materials are dissolved in N,N-dialkylformamide, and the solutionis stirred for 10 to 60 minutes, with a reaction temperature controlled at 25 to 250 DEG C, and a reaction time of 24 to 72 hours; with a hydrothermal synthesis method, the metal organic frame porousadsorption material is obtained through complexation. The material has characteristics of large specific surface area, ordered pore structure heights, controllable pore dimensions, controllable pore surface functional groups, controllable pore surface potential energies and substantially improved adsorption capacity.

Description

technical field [0001] The invention relates to a modified metal-organic framework porous adsorption material and its adsorption working fluid pair, which are used to reduce the desorption temperature of the system, increase the adsorption capacity of the system cycle, and further increase the cooling capacity of the adsorbent per unit mass. The metal-organic framework porous material adsorption working fluid pair can apply low-temperature waste heat or solar energy in typical closed adsorption air-conditioning conditions, and the regeneration temperature is 50-150°C. The invention belongs to the application of novel porous materials in the field of chemical industry. Background technique [0002] Adsorption refrigeration technology uses refrigerants that have no impact on the environment, and can be driven by low-grade thermal energy such as solar energy and industrial waste heat. It has both environmental protection and energy-saving advantages, and has attracted extensive...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C09K5/04
Inventor 王海燕崔群李全国杜旭东芮征球
Owner NANJING UNIV OF TECH
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