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Ni and Ba bimetal MOFs as well as preparation method and application thereof

A bimetallic and reaction solvent technology, applied in the direction of offensive equipment, explosives, compressed gas generation, etc., can solve the problems of weak catalytic ability, affecting the thermal decomposition of propellant components, and uneven dispersion of catalysts, so as to reduce the pressure index, Ease of industrial production and simple synthesis method

Active Publication Date: 2022-01-14
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these catalysts often have problems such as uneven dispersion, weak catalytic ability or affecting the thermal decomposition of propellant components.

Method used

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  • Ni and Ba bimetal MOFs as well as preparation method and application thereof
  • Ni and Ba bimetal MOFs as well as preparation method and application thereof
  • Ni and Ba bimetal MOFs as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a kind of Ni, Ba bimetallic MOFs, the molecular formula of Ni, Ba bimetallic MOFs is: Ba 2 Ni(CO 2 h) 6 (OH 2 ) 4 , and its crystal structure parameters are shown in Table 1.

[0048] Table 1 Crystal structure parameters of NiBa-MOFs

[0049]

[0050]

[0051]

[0052] The structure of Ni, Ba bimetallic MOFs is as follows Figure 1 to Figure 5(c) shown. to Ba 2 Ni(CO 2 h) 6 (OH 2 ) 4 Structural description of MOFs:

[0053] The layered structure of NiBa-MOFs consists of one-dimensional metal chains (Ni-Ba-Ba-Ni-Ba-Ba) and C atoms. In each layer, there are two connections between metal chains. the first is Figure 4 The Ba-O-Ba bond in. The other is an O-C-O bond formed by C1 and C3 atoms, but each C2 is only connected to NiO 6 unit( Figure 4 ). Figure 4The Ni-Ba-Ba-Ni-Ba-Ba chain in is composed of NiO6 (tetragonal bipyramids) and BaO 10 (Irregular pentadecahedron) composed of two kinds of PBU. In the chain each NiO...

Embodiment 2

[0068] This example presents the application of the Ni, Ba bimetallic MOFs of Example 1 as a combustion catalyst for a solid double-base propellant. Specific as Figure 14 to Figure 23 shown.

[0069] The main gaseous product of pyrolysis of NiBa-MOFs is H 2 O(m / z=18), CO(m / z=28), CO 2 (m / z=44), O·(m / z=16), -OH(m / z=17) such as Figure 14 . h 2 O and CO 2 The infrared absorption peak of Figure 15 was detected in .

[0070] Such as Figure 16 As shown, there are two peaks in the pyrolysis process of pure CL-20. The weak endothermic peak at 168.9 °C was attributed to the solid phase transition of CL-20, and the exothermic peak appeared at 248.0 °C. After mixing with NiBa-MOFs, the thermal decomposition peak of CL-20 / NiBa-MOFs appeared at 245.2 °C, which was 2.8 °C lower than that of pure CL-20 (248.0 °C). The weak endothermic peak of CL-20 / NiBa-MOFs appeared at 163.1 °C, and the lower endothermic peak temperature was due to the low initial decomposition peak temperatu...

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Abstract

The invention provides Ni and Ba bimetal MOFs as well as a preparation method and application thereof. The molecular formula of the Ni and Ba bimetal MOFs is Ba2Ni(CO2H)6(OH2)4. According to the method, 1,4-bis (1H-pyrazol-4-yl)benzene, nickel nitrate hexahydrate and barium nitrate are used as raw materials, a reaction solvent is added, and the material is synthesized in a hydrothermal reaction kettle. The reaction solvent is a mixed solution prepared from N,N-dimethylformamide and water according to a volume ratio of 5:4. The reaction conditions in the hydrothermal reaction kettle comprise that the temperature of the reaction system is increased to 135 DEG C from room temperature within 2 hours, the temperature is kept at 135 DEG C for 48 hours, and then the temperature is reduced to 35 DEG C at the cooling rate of 1.4 DEG C per hour. The metal organic framework compound is formed by metal ions Ni and Ba and an organic linking group, and can be used as a catalyst for combustion of a double-base propellant, so that rapid steady-state combustion of the double-base propellant is realized, the pressure index is reduced, and the propulsive energy is improved. The synthesis method is simple, different from preparation of most MOFs materials, the yield is high, and industrial production is easier.

Description

technical field [0001] The invention belongs to the technical field of energetic materials and relates to bimetallic MOFs, in particular to Ni and Ba bimetallic MOFs, a preparation method and an application. Background technique [0002] Solid propellants are the source of power for solid rocket motors. The combustion performance of the propellant directly affects the range, flight speed and guidance accuracy of the rocket. By adding an appropriate amount of combustion catalyst to the solid propellant to adjust the energy release rate and efficiency of the propellant combustion, thereby increasing the combustion rate of the solid propellant, reducing the combustion pressure index, and making the propellant burn efficiently and stably. Adding combustion catalysts is an important means to optimize the combustion performance of solid propellants. [0003] At present, composite catalysts composed of a certain amount of lead, copper and carbon black, or metal powders, metal oxi...

Claims

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Application Information

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IPC IPC(8): C08G83/00C06B23/00C06D5/00
CPCC08G83/008C06D5/00C06B23/007
Inventor 陈超赵凤起仪建华李海建秦钊王长健孙志华许毅
Owner XIAN MODERN CHEM RES INST
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