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Pb-Ba bimetal MOFs as well as preparation method and application thereof

A bimetallic and reaction solvent technology, applied in the fields of Ba bimetallic MOFs, bimetallic MOFs, preparation, and Pb, can solve the problems of weak catalytic ability, uneven catalyst dispersion, affecting the thermal decomposition of propellant components, etc., to reduce the pressure. Exponential, easy industrial production, high yield effect

Pending Publication Date: 2022-01-18
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Pb-Ba bimetal MOFs as well as preparation method and application thereof
  • Pb-Ba bimetal MOFs as well as preparation method and application thereof
  • Pb-Ba bimetal MOFs as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] This embodiment provides a kind of Pb, Ba bimetallic MOFs, the molecular formula of Pb, Ba bimetallic MOFs is: Ba 4 Pb 4 (CH 3 CO 2 ) 8 [(CH 6 CO 2 ) 4 Pb](CH 3 CO 2 ) 4 , and its crystal structure parameters are shown in Table 1.

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

[0049]

[0050]

[0051]

[0052] The structure of Pb, Ba bimetallic MOFs is as follows Figure 1 to Figure 5(c) shown. to Ba 4 Pb 4 (CH 3 CO 2 ) 8 [(CH 6 CO 2 ) 4 Pb](CH 3 CO 2 ) 4 The structure description:

[0053] In the structure, the smallest repeating unit (Secondary Building Unit (SBU)) consists of nine polyhedrons, such as Figure 4 as shown in a. SBUs involve three main building units (PBUs), including 4 Pb Ⅰ o 10 (Irregular tetradecahedron), 1 Pb Ⅱ o 8 (Irregular hexahedron) and 4 BaO 10 (Irregular Tridecahedron). SBUs contain two Pb Ⅰ o 10 and two BaO 10 The 4 PBUs of the unit are in Figure 4 A rectangular plane (named after A1) ...

Embodiment 2

[0069] This example presents the application of the Pb, Ba bimetallic MOFs of Example 1 as a combustion catalyst for a solid double-base propellant. Specific as Figures 14 to 23 shown.

[0070] During the pyrolysis process of PbBa-MOFs, the main gaseous decomposition product of PbBa-MOFs is H 2 O(m / z=18), CO(m / z=28), CO 2 (m / z=44) and some small molecular fragments -CH 3 (m / z=15), also observed O (m / z=16), -OH (m / z=17), -C 2 h 3 (m / z=27), -C 2 h 6 (m / z=30).

[0071] The FTIR curve of the pyrolysis process of PbBa-MOFs is as follows Figure 15 Shown, describing the same product as the mass spectrum, 2360, 1383 and 669 cm -1 The peak at is attributed to CO 2 The presence of, 1750 and 656cm -1 The peak at is attributed to H 2 The appearance of O. 1230cm -1 The infrared absorption at can be attributed to the vibration of the C–H bond.

[0072] Such as Figure 16 As shown, there are two peaks in the pyrolysis process of pure CL-20. The weak endothermic peak at 168...

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Abstract

The invention provides Pb-Ba bimetal MOFs as well as a preparation method and application thereof. The molecular formula of the Pb-Ba bimetal MOFs is Ba4Pb4(CH3CO2)8[(CH6CO2)4Pb](CH3CO2)4. According to the method, 1,3,5-tris((1H-pyrazol-4-yl)phenyl)benzene, lead nitrate and barium nitrate are used as raw materials, a reaction solvent is added, and synthesis is performed in a hydrothermal reaction kettle. The reaction solvent is a mixed solution prepared from N,N-dimethylacetamide and water according to a volume ratio of 10: 7. The reaction conditions in the hydrothermal reaction kettle are as follows: 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 a cooling rate of 1.4 DEG C per hour. The metal organic framework compound is formed by metal ions Pb and Ba and an organic linking group, and can be used as a catalyst for combustion of a double-base propellant, so rapid steady-state combustion of the double-base propellant is realized, a pressure index is reduced, and propulsive energy is improved. The method is simple in synthesis, different from preparation of most MOFs materials, high in yield and easier for industrial production.

Description

technical field [0001] The invention belongs to the technical field of energetic materials and relates to bimetallic MOFs, in particular to a Pb 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 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C06B23/00C06D5/06
CPCB01J31/1691B01J31/1815C06B23/007C06D5/06B01J2531/25B01J2531/44
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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