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CN-121972142-A - Have open Bi3+The metal organic framework material of the site is N2Application in O separation

CN121972142ACN 121972142 ACN121972142 ACN 121972142ACN-121972142-A

Abstract

The invention belongs to the technical field of gas separation, and particularly relates to an application of a metal organic framework material with an open Bi 3+ site in N 2 O separation. The molecular formula of the metal organic framework material is Bi 9 (C 9 H 3 O 6 ) 9 (H 2 O) 9 , the metal organic framework material takes bismuth nitrate pentahydrate as a metal source, and trimesic acid as an organic ligand, and the metal organic framework material is generated by reaction in a solvothermal environment. The metal organic framework material has an open Bi 3+ site, can generate strong specific interaction with N 2 O molecules, and can still realize high-selectivity adsorption of N 2 O under the coexistence condition of a plurality of competing gases such as N 2 、O 2 、CO 2 and the like.

Inventors

  • WANG LI
  • WANG MINGXI
  • YANG JIANGFENG
  • LI JINPING

Assignees

  • 太原理工大学

Dates

Publication Date
20260505
Application Date
20260213

Claims (7)

  1. 1. The application of the metal organic framework material with the open Bi 3+ site in N 2 O separation is characterized in that the molecular formula of the metal organic framework material is Bi 9 (C 9 H 3 O 6 ) 9 (H 2 O) 9 , the molecular formula of the metal organic framework material is Bi 9 (C 9 H 3 O 6 ) 9 (H 2 O) 9 , the metal organic framework material is generated by performing solvothermal reaction by taking bismuth nitrate pentahydrate as a metal source, trimesic acid as an organic ligand and methanol as a solvent, and the material needs to be activated at a high temperature when gas is separated.
  2. 2. The use of the metal organic framework material with open Bi 3+ sites according to claim 1 for N 2 O separation, wherein Bi 3+ is Bi-O nine coordination in the structure of the metal organic framework material, wherein 8O are all from carboxyl of the ligand, and one O is from water molecules, and water molecules can be removed by high-temperature activation, so that a space coordination Bi 3+ site is exposed.
  3. 3. The use of the metal organic framework material with an open Bi 3+ site in N 2 O separation according to claim 1, wherein the preparation method of the metal organic framework material comprises the steps of dissolving bismuth nitrate pentahydrate and trimesic acid in methanol, transferring the mixture into a polytetrafluoroethylene reaction kettle, putting the polytetrafluoroethylene reaction kettle into an oven for reaction, obtaining white powder through filtration, washing the white powder with methanol three times, drying the white powder in air, and activating the crystal in dynamic vacuum for 12 hours to remove the solvent in a crystal pore canal, thereby obtaining an activated sample.
  4. 4. The application of the metal-organic framework material with the open Bi 3+ site in N 2 O separation, according to claim 1, is characterized in that the molar ratio of bismuth nitrate pentahydrate to trimesic acid is 1:15-20.
  5. 5. The use of the metal-organic framework material with an open Bi 3+ site according to claim 1 in N 2 O separation, characterized in that the reaction temperature is 120-160 ℃ and the reaction time is 24-72 hours.
  6. 6. The use of the metal-organic framework material with an open Bi 3+ site according to claim 1 in N 2 O separation, characterized in that the activation temperature is 100-200 ℃.
  7. 7. The method for separating N 2 O by using a metal organic framework material with an open Bi 3+ site as claimed in claim 1, wherein the metal organic framework material can be desorbed and regenerated after gas adsorption and recycled.

Description

Application of metal organic framework material with open Bi 3+ site in N 2 O separation Technical Field The invention belongs to the technical field of gas separation, and particularly relates to an application of a metal organic framework material with an open Bi 3+ site in N 2 O separation. Background Nitrous oxide (N 2 O) emissions are next to carbon dioxide and methane as the global third largest greenhouse gas. Although the total amount of N 2 O emissions is relatively low compared to carbon dioxide (CO 2), the warming effect is extremely strong, with the warming potential of N 2 O being approximately 273 times that of CO 2 over 100 years. At the same time, the residence time of N 2 O in the atmosphere is long, about 120 years. The nitrous oxide has wide application, and can be widely applied to the fields of foods, medicines, fuels and catalysis, and can also be used as an N or O atom donor. The largest industrial emission source of N 2 O is tail gas generated in the production of adipic acid, nitric acid and caprolactam, which mainly contains nitrogen (N 2), oxygen (O 2）、CO2 and the like, wherein the properties of N 2 O and N 2、O2 and the like are greatly different, so that separation is easy, but the properties of N 2 O and CO 2 are very similar, so that the trapping of N 2 O is difficult to realize in the presence of multicomponent competitive gas containing CO 2. At present, the pressure swing adsorption separation (PSA) technology can be used in the N 2 O treatment process, and has the characteristics of low energy consumption, simple and convenient operation and the like, so that the realization of high-efficiency separation of four gases by adopting an adsorption separation mode is still a difficult challenge. Disclosure of Invention Aiming at the problems in the prior art, the invention provides an application of a metal organic framework material with an open Bi 3+ site in N 2 O separation. The open Bi 3+ locus in the metal organic framework material has strong interaction with N 2 O molecules, and can realize the efficient trapping of N 2 O in the presence of various competitive gases. The invention is realized by the following technical scheme: the application of a metal organic framework material with an open Bi 3+ site in N 2 O separation is disclosed, wherein the molecular formula of the metal organic framework material is Bi 9(C9H3O6)9(H2O)9, the metal organic framework material is generated by performing solvothermal reaction by taking bismuth nitrate pentahydrate as a metal source, trimesic acid as an organic ligand and methanol as a solvent. In the separation of gases, high temperature activation of the material is required. Further, the preparation method of the metal organic framework material comprises the following steps of dissolving bismuth nitrate pentahydrate and trimesic acid in methanol, transferring the mixture into a polytetrafluoroethylene reaction kettle, putting the polytetrafluoroethylene reaction kettle into an oven for reaction, filtering to obtain white powder, washing the white powder with methanol for three times, drying the white powder in air, and activating crystals in dynamic vacuum for 12 hours to remove solvents in crystal pore channels to obtain an activated sample. Further, in the structure of the metal organic framework material, bi 3+ is Bi-O nine coordination, wherein 8O is from carboxyl of the ligand, and one O is from water molecule, and the water molecule can be removed by high-temperature activation, so that a space coordination Bi 3+ site is exposed. Further, the molar ratio of bismuth nitrate pentahydrate to trimesic acid is 1:15-20, preferably 1:17.26. Further, the reaction temperature is 120-160 ℃, the reaction time is 24-72 hours, preferably, the temperature is 140 ℃, and the reaction time is 48 hours. Further, the activation temperature is 100-200 ℃, preferably the activation temperature is 150 ℃. Furthermore, the metal organic framework material can be desorbed and regenerated after gas is adsorbed, and is recycled. The beneficial technical effects of the invention are as follows: The beneficial technical effects of this patent are mainly embodied in the following aspects: (1) The metal organic framework material provided by the invention has an open Bi 3+ site, can generate strong specific interaction with N 2 O molecules, and can still realize high-selectivity adsorption of N 2 O under the coexistence condition of a plurality of competing gases such as N 2、O2、CO2. The adsorption quantity of the material to N 2 O is obviously higher than that of CO 2、N2 and O 2, the selectivity of N 2O/CO2 is obviously better than that of the material of a comparative example, and the material has excellent N 2 O trapping capacity. (2) DFT calculation proves that the open Bi3+ locus in the material has a shorter interaction distance and stronger binding energy with N 2 O molecules, so that the mechanism of high-selectivity adsorption is disclosed in theory