Porous ammonium perchlorate as well as preparation method and application thereof

Abstract

The invention provides porous ammonium perchlorate as well as a preparation method and application thereof. The pore diameter of the porous ammonium perchlorate is 5nm-10mu m, the porosity is 1-30%, and the specific surface area is 0.05-0.35 m < 2 > / g. The porous ammonium perchlorate is prepared by the heating weightlessness analysis device, and the ammonium perchlorate is decomposed to generate the porous material with a uniform pore structure by regulating and controlling the heating rate and / or the weight loss, so that the performance of the ammonium perchlorate is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of material science and chemical engineering, and further to porous ammonium perchlorate and a preparation method and application thereof. Background Art

[0002] Ammonium Perchlorate (AP) is an important chemical substance with the chemical formula NH4ClO4. It is a strong oxidant that explodes when mixed with reducing agents, flammable materials or metal powders. It is widely used in rocket propellants, explosives and high-energy density materials.

[0003] In recent years, with the continuous increase in energy and environmental demands, traditional ammonium perchlorate is used as an oxidant in propellants or explosives. However, the specific surface area and pore structure of ammonium perchlorate affect its reaction performance. Traditional ammonium perchlorate has obvious deficiencies in energy release rate and reaction controllability due to its lack of porous structure.

[0004] Porous ammonium perchlorate has a large specific surface area and porous structure, and shows potential application prospects in catalysis, energy storage, etc. Generally, porous ammonium perchlorate is obtained by heating, usually in a thermal analyzer under the protection of an inert gas. Although the above method can improve the porous structure of ammonium perchlorate to a certain extent, ammonium perchlorate is extremely unstable when heated and is prone to violent explosion. It not only needs to be carried out under the protection of an inert gas, but also needs to control the amount used during heating, making it difficult to carry out heating preparation above the gram level, which limits the preparation of porous ammonium perchlorate.

[0005] Therefore, developing a porous ammonium perchlorate with a simple, efficient and controllable pore structure and a preparation method thereof is an urgent problem to be solved in the current technical field. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a porous ammonium perchlorate and a preparation method thereof. The present invention prepares porous ammonium perchlorate by a heating weight loss analysis device, and decomposes the ammonium perchlorate to generate a porous material with a uniform pore structure by regulating the heating rate, temperature and weight loss during the heating process, thereby effectively improving the performance of the ammonium perchlorate. The preparation method provided by the present invention is simple, safe and efficient, suitable for mass preparation of porous ammonium perchlorate, and has good practical value.

[0007] First, one of the objects of the present invention is to provide a porous ammonium perchlorate.

[0008] Specifically, the porous ammonium perchlorate has a pore size of 5 nm to 10 μm, preferably 8 nm to 7 μm; a porosity of 1 to 30%, preferably 5 to 30%, more preferably 8 to 29%; a specific surface area of ​​0.05 to 0.35 m 2 / g, preferably 0.08 to 0.0.3 m 2 / g, more preferably 0.09 to 0.29 m 2 / g.

[0009] The porous ammonium perchlorate provided by the invention has a rich, uniform and interconnected pore structure, wherein the pore structure comprises two parts: micron-scale macropores (above 1 micron) and nanometer-scale micropores (below 1 micron), wherein the pore diameter of the macropores ranges from 1 to 10 microns, and the pore diameter of the micropores ranges from 8 nm to 1 micron.

[0010] Secondly, a second object of the present invention is to provide a method for preparing the porous ammonium perchlorate which is one of the objects of the present invention.

[0011] Specifically, the method comprises the following steps:

[0012] Step 1, drying the ammonium perchlorate;

[0013] Step 2: In a heating weight loss analysis device, the ammonium perchlorate of step 1 is heated to obtain porous ammonium perchlorate.

[0014] Furthermore, in step 1, the particle size of the ammonium perchlorate is 80-120 mesh, and the purity is greater than 99%, preferably greater than 99.5%.

[0015] It is worth mentioning that before the ammonium perchlorate is heated and decomposed, the water can be removed by simple drying to ensure that there will be no excessive water release and thermal decomposition side reactions during the heating process, and to maintain the stability of the heating process. The drying method can be conventional oven drying.

[0016] Furthermore, in step 2, the heating rate is controlled to be 0.05 to 15°C / min, preferably 0.5 to 10°C / min, and particularly preferably 1 to 5°C / min. During the heating process, ammonium perchlorate undergoes thermal decomposition to form ammonium chloride and nitrogen oxide (NO x ) and other gases. During this process, ammonium perchlorate is continuously decomposed due to the release of gas, thereby forming a porous structure. By controlling the heating temperature and weight loss rate, the size, shape and distribution of the pore structure can be adjusted. At the same time, the heating time will affect the connectivity of the pores. The heating temperature and weight loss rate can be controlled to obtain porous ammonium perchlorate with the desired porosity.

[0017] Further, in step 2, the heating termination condition is:

[0018] Condition 1: heating to 150-260°C, preferably to 200-240°C;

[0019] or,

[0020] Condition 2: Heating until the weight loss rate of ammonium perchlorate is greater than 0 and less than or equal to 30%.

[0021] The present invention can avoid uneven decomposition and violent decomposition caused by excessively high and too fast local temperature by controlling the heating rate and / or detecting the weight loss rate, and control the ammonium perchlorate to protect a relatively balanced and stable state during the decomposition process. Even without the protection of inert gas, no violent reaction will be caused due to the introduction of oxygen. Moreover, when preparing above the gram level, there is heat exchange between the ammonium perchlorate and the air, which plays a good buffering role, avoids the rapid thermal decomposition of the ammonium perchlorate, and keeps the reaction in a safe and stable state. At the same time, the ammonium perchlorate releases oxygen and heat during decomposition, and a too fast reaction may even cause combustion or explosion. The participation of air also helps the diffusion of decomposition products (such as oxygen), thereby reducing the pressure or local high temperature generated in the reaction, so that the reaction is maintained in a relatively stable state.

[0022] It is worth mentioning that during the cooling process, since the decomposition products of ammonium perchlorate have formed a porous structure, the cooling rate does not affect the formation of pores.

[0023] Furthermore, in step 2, the heating of ammonium perchlorate is carried out on a heating weight loss analysis device, wherein the heating weight loss analysis device includes a heating unit, a weighing unit, a temperature control unit and a detection unit.

[0024] Furthermore, a heating unit is arranged around the weighing pan of the weighing unit, and is used to heat the sample (ammonium perchlorate) on the weighing pan; a temperature control unit is connected to the heating unit, and is used to control the heating rate of the heating unit; and a detection unit is connected to the weighing unit, and is used to detect and record the mass change of the ammonium perchlorate during the heating process.

[0025] Furthermore, a bracket is provided on the upper part of the weighing unit, and the heating unit is arranged on the top of the bracket; a pillar is provided on the weighing unit, and a weighing pan is placed on the top of the pillar; the heating unit surrounds the weighing pan and can evenly heat the sample in the weighing pan.

[0026] The above-mentioned heating weight loss analysis device provided by the present invention, on the one hand, can use air as a heat conduction medium in the process of heating ammonium perchlorate, which plays a role of "heat dissipation" and avoids the rapid thermal decomposition of ammonium perchlorate. Heat is gradually transferred to ammonium perchlorate through air, which can heat ammonium perchlorate evenly, and the relatively large size of ammonium perchlorate particles also helps to slowly heat up, which can effectively avoid the risk of too fast decomposition caused by too fast heat accumulation; on the other hand, due to the fluidity of the air in the heating unit, the heat exchange of the surrounding air makes the temperature difference between the surface and the inner layer of the ammonium perchlorate particles gradually balanced, thereby avoiding the generation of the "hot spot" phenomenon, and the presence of air helps to maintain a more uniform temperature distribution, reducing the problem of local runaway during the decomposition process. The present invention uses gradual heating and heat exchange through air to effectively control the reaction rate and decomposition process, which not only avoids the problem of excessive decomposition caused by excessive heating, but also improves the stability of the reaction.

[0027] Finally, the third object of the present invention is to provide the application of the porous ammonium perchlorate of one of the objects of the present invention.

[0028] Specifically, the porous ammonium perchlorate, which is one of the purposes of the present invention, has a rich pore structure and a large specific surface area, and can be used for energetic materials, propellants, gas adsorption and separation materials, catalytic reaction materials, etc.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. In the heating weight loss analysis device of the present invention, porous ammonium perchlorate is prepared by a heating method. During the heating process, the gas generated by the thermal decomposition reaction can diffuse through the pores in the ammonium perchlorate, promote the formation of pores, and generate a porous material. The number and shape of the pores can be controlled by adjusting the termination temperature and the weight loss rate.

[0031] 2. The present invention can effectively form a pore structure in ammonium perchlorate and increase the specific surface area of ​​the pores by controlling the termination temperature of the heating process.

[0032] 3. The present invention can adjust the characteristics of the pore structure by adjusting the heating temperature so that the pore size, porosity, pore connectivity, etc. can meet different application requirements.

[0033] 4. The porous ammonium perchlorate prepared by the present invention retains the excellent oxidation performance of ammonium perchlorate, and its porous structure further increases the contact area between the ammonium perchlorate and the reactants, thereby enhancing the efficiency of the oxidation reaction.

[0034] 5. The porous ammonium perchlorate provided by the present invention can be used not only in the fields of traditional rocket propellants and explosives, but also in the fields of gas adsorption and separation, catalytic reactions, etc., and has broad industrial application prospects.

[0035] 6. The present invention provides a method and device for preparing porous ammonium perchlorate at the gram level or above. The method is not only simple and has mild conditions, but also can regulate the pore structure of ammonium perchlorate.

[0036] 7. The present invention uses the above-mentioned heating weight loss analysis device and controls the heating rate and weight loss rate during the heating process to not only obtain porous ammonium perchlorate with different pore structures and distributions, but also overcomes the limitation that inert gas protection must be used during the heating process. At the same time, it breaks through the preparation of large quantities of porous ammonium perchlorate above the gram level, and has good application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the connection of the heating weight loss analysis device provided in Example 1 of the present invention;

[0038] Figure 2 A schematic diagram of the partial structure of the heating weight loss analysis device provided in Example 1 of the present invention;

[0039] Reference numerals: 1. Heating unit (heating jacket or ceramic heating jacket); 2. Weighing unit (analytical balance); 3. Temperature control unit (temperature control box); 4. Detection unit (computer); 5. Bracket; 6. Support column; 7. Scale pan;

[0040] Figure 3 This is an electron microscope scanning image of the raw material ammonium perchlorate used in Example 2 of the present invention;

[0041] Figure 4 This is a particle size distribution analysis diagram of the raw material ammonium perchlorate used in Example 2 of the present invention;

[0042] Figure 5 This is a scanning electron microscope image of the porous ammonium perchlorate prepared in Examples 2 to 4 of the present invention;

[0043] Figure 6 It is a cross-sectional electron microscope scanning image of the porous ammonium perchlorate particles prepared in Examples 2 to 4 of the present invention;

[0044] Figure 7 X-ray diffraction patterns of porous ammonium perchlorate prepared in Examples 2 to 4 of the present invention;

[0045] Figure 8 The mercury inflow and outflow curves of the porous ammonium perchlorate prepared in Examples 2 to 4 of the present invention;

[0046] Fig. 9 The mercury inflow amount diagram of porous ammonium perchlorate prepared in Examples 2 to 4 of the present invention at different stages;

[0047] Fig.10 The pore structure distribution diagram of the porous ammonium perchlorate prepared in Examples 2 to 4 of the present invention;

[0048] Fig.11 The pore size distribution diagram of the porous ammonium perchlorate prepared in Examples 2 to 4 of the present invention corresponds to the long pore distribution diagram;

[0049] Fig.12 This is a graph showing the change in specific surface area of ​​porous ammonium perchlorate prepared in Examples 2 to 4 of the present invention;

[0050] Fig.13 This is a specific surface area composition diagram of the porous ammonium perchlorate prepared in Examples 2 to 4 of the present invention. DETAILED DESCRIPTION

[0051] The present invention is described in detail below in conjunction with specific embodiments. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by those skilled in the art based on the contents of the present invention still fall within the scope of protection of the present invention.

[0052] Ammonium perchlorate was purchased from Tianyuan Chemical Co., Ltd. with a purity greater than 99.5% and a particle size of 80 to 120 mesh.

[0053] Example 1

[0054] This example is used to illustrate the heating weight loss analysis device for preparing porous ammonium perchlorate by heating. Figure 1 A connection schematic diagram of the heating weight loss analysis device is shown; Figure 2 The schematic diagram of the structure of the heating part and the weighing part of the heating weight loss analysis device is shown.

[0055] Depend on Figure 1 It can be seen that the heating weight loss device of this embodiment includes a heating unit 1, a weighing unit 2, a temperature control unit 3 and a detection unit 4.

[0056] Further, by Figure 1 and Figure 2 It can be seen that the heating unit 1 is a heating sleeve or a ceramic heating sleeve, which is arranged around the weighing pan 7 of the weighing unit 2 and is used to heat the sample (ammonium perchlorate) on the weighing pan 7; the temperature control unit 3 is a temperature control box, which is connected to the heating unit 1 through a thermocouple and is used to control the heating rate of the heating unit 1; the detection unit 4 is a computer, which is connected to the weighing unit 2 and is used to detect and record the mass change of the sample (ammonium perchlorate) during the heating process. The weighing unit 2 is connected to the computer through an RS232 interface.

[0057] Furthermore, by Figure 2It can be seen that the weighing unit 2 is an analytical balance, a bracket 5 is provided on the upper part thereof, a ceramic heating sleeve is arranged on the top platform of the bracket 5, a pillar 6 is provided on the weighing unit 2, the top of the pillar 6 is located at the center of the ceramic heating sleeve, the top of the pillar 6 is used to place a weighing pan 7, the weighing pan 7 can be an alumina sheet, the alumina sheet is placed on the top of the pillar 6 for placing samples, the ceramic heating sleeve surrounds the alumina sheet, is used to heat the sample on the alumina sheet, and ensures that the sample is evenly heated, during the heating process, the mass change of the sample can be recorded at any time by the detection unit 4.

[0058] Example 2

[0059] This example is used to illustrate the preparation of porous ammonium perchlorate using the heating weight loss analysis device of Example 1. The specific process is as follows:

[0060] Weigh 4 g of ammonium perchlorate (pre-dried, purity > 99.5%) and place it on an alumina sheet. The temperature control box controls the heating rate of the ceramic heating jacket to 5 °C min. -1 The temperature was raised from room temperature to 200°C for 38 minutes, and the mass change of ammonium perchlorate during the heating process was recorded in real time by a computer. After the heating was completed, the ammonium perchlorate was slowly cooled to room temperature to obtain a white ammonium perchlorate with an obvious porous structure. The real-time recorded weight loss rate of ammonium perchlorate was 9.06%.

[0061] Figure 3 The electron microscope scanning image of the raw material ammonium perchlorate used in this embodiment is shown.

[0062] Figure 4 The particle size distribution diagram of the raw material ammonium perchlorate used in this embodiment is shown.

[0063] Depend on Figure 3 and Figure 4 It can be seen that the D50 of the raw material ammonium perchlorate used in this embodiment is 177.4 μm.

[0064] Example 3

[0065] This example is used to illustrate the preparation of porous ammonium perchlorate using the heating weight loss analysis device of Example 1. The specific process is as follows:

[0066] Weigh 10g of ammonium perchlorate (pre-dried, purity>99.5%) and place it on an alumina sheet. The temperature control box controls the heating rate of the ceramic heating jacket to 2℃·min. -1 The temperature was raised from room temperature to 220°C for 105 minutes, and the mass change of ammonium perchlorate during the heating process was recorded in real time by a computer. After the heating was completed, the ammonium perchlorate was slowly cooled to room temperature to obtain a white ammonium perchlorate with an obvious porous structure. The weight loss rate of ammonium perchlorate was recorded in real time as 20.23%.

[0067] Example 4

[0068] This example is used to illustrate the preparation of porous ammonium perchlorate using the heating weight loss analysis device of Example 1. The specific process is as follows:

[0069] Weigh 20g of ammonium perchlorate (pre-dried, purity>99.5%) and place it on an alumina sheet. The temperature control box controls the heating rate of the ceramic heating jacket to 1℃·min. -1 The temperature was raised from room temperature to 240°C, and the heating time was 215 minutes. The mass change of ammonium perchlorate during the heating process was recorded in real time by a computer. After the heating was completed, the ammonium perchlorate was slowly cooled to room temperature to obtain a white ammonium perchlorate with an obvious porous structure. The real-time recorded weight loss rate of ammonium perchlorate was 28.67%.

[0070] The porous ammonium perchlorate (PAP) prepared in Examples 2 to 4 was subjected to electron microscopy scanning and X-ray diffraction analysis to observe its surface morphology, pore distribution and crystal structure changes.

[0071] Figure 5 The electron microscope scanning images of the raw material ammonium perchlorate and the porous ammonium perchlorate prepared in Examples 2 to 4 are shown.

[0072] Figure 6 The electron microscope scanning images of the cross-sections of the porous ammonium perchlorate particles prepared in Examples 2 to 4 are shown.

[0073] Figure 7 X-ray diffraction patterns of raw material ammonium perchlorate and porous ammonium perchlorate prepared in Examples 2 to 4 are shown.

[0074] Depend on Figure 5 It can be seen that Figure 5 (a) is the surface morphology of ordinary traditional ammonium perchlorate (AP), whose particle surface is smooth and has no pores. Figure 5 (b) to (d) are the apparent morphologies of porous ammonium perchlorate (PAP) when the decomposition weight loss is 9.06%, 20.23%, and 28.67%, respectively. The particle surface becomes uneven, with many micropores, and the pores are distributed all over the particle surface. Figure 6 It can be seen that the internal pores of the porous ammonium perchlorate (PAP) particles prepared in Examples 2 to 4 are in a staggered interconnected state. Figure 7 It can be seen that the crystal structure of the porous ammonium perchlorate (PAP) prepared in Examples 2 to 4 is the same as the crystal structure of conventional ammonium perchlorate (AP) and has not changed. This indicates that ammonium perchlorate (PAP) with a porous structure is prepared in Examples 2 to 4.

[0075] The pore structure of the porous ammonium perchlorate prepared in Examples 2 to 4 was evaluated by mercury intrusion porosimetry using an AUTOPORE 9600 equipment model.

[0076] Figure 8 The mercury advance and retreat curves of the raw material ammonium perchlorate and the porous ammonium perchlorate prepared in Examples 2 to 4 are shown.

[0077] Fig. 9 The graphs show the mercury inflow at different stages for the raw material ammonium perchlorate and the porous ammonium perchlorate prepared in Examples 2 to 4.

[0078] Fig.10 The pore structure distribution diagrams of the raw material ammonium perchlorate and the porous ammonium perchlorate prepared in Examples 2 to 4 are shown.

[0079] Fig.11 The pore size distribution diagram of the raw material ammonium perchlorate and the porous ammonium perchlorate prepared in Examples 2 to 4 is shown.

[0080] Fig.12 The graph showing the change in specific surface area of ​​the raw material ammonium perchlorate and the porous ammonium perchlorate prepared in Examples 2 to 4 is shown.

[0081] Fig.13 The specific surface area composition diagram of the raw material ammonium perchlorate and the porous ammonium perchlorate prepared in Examples 2 to 4 is shown.

[0082] Depend on Figure 8 It can be seen that there is only one mercury injection stage for untreated ordinary ammonium perchlorate (AP), while there are three mercury injection stages for partially decomposed porous ammonium perchlorate (PAP), wherein, when the pressure is less than 10 psi, the increase in the amount of mercury injection is mainly due to the voids between the ammonium perchlorate (AP) particles. As the pressure increases, the undecomposed ordinary ammonium perchlorate (AP) has no pores, and the amount of mercury injection remains unchanged, while the partially decomposed porous ammonium perchlorate (PAP) has a second obvious mercury injection at about 60 psi. When the pressure reaches 10,000 psi, the third mercury injection occurs, but the amount of mercury injection is significantly less than the first two times. Therefore, it can be considered that the second and third mercury injections correspond to different pore structures, and the volume of mercury injection corresponds to the volume of pores of corresponding pore diameters in ammonium perchlorate (AP). It is further proved that there are a large number of interconnected pore structures inside the porous ammonium perchlorate particles prepared in Examples 2 to 4.

[0083] Depend on Fig. 9It can be seen that with the increase of weight loss rate, the amount of mercury in the first and second stages increases. In the first stage, with the increase of weight loss rate, it is mainly because the surface of ammonium perchlorate (AP) particles becomes uneven due to decomposition, which can adsorb more mercury ions, and some macropores connected to the surface are also injected with a small amount of mercury; while in the second stage, it is mainly the adsorption of mercury by the micron-sized macropores produced by the decomposition of ammonium perchlorate (AP) particles. With the increase of weight loss rate, the porosity increases and the amount of mercury inflow increases; while in the third stage, the volume of micropores decreases with the increase of decomposition degree, which indicates that the volume of micropores decreases slightly with the deepening of decomposition degree. According to the test results of mercury injection method, the porosity of porous ammonium perchlorate (PAP) with different weight loss conditions is calculated to be 0%, 8.46%, 17.96% and 26.58% respectively.

[0084] Depend on Fig.10 It can be seen that the pore diameter of porous ammonium perchlorate (PAP) is mainly divided into two parts: micron-scale macropores and nanoscale micropores. The maximum pore diameter of the macropores is about 7μm, and the pore diameter increases with the increase of the weight loss rate. The small pores are mainly concentrated in 8-25nm. With the increase of the weight loss rate, the pore diameter of the small pores decreases slightly, but the change is not large.

[0085] Depend on Fig.11 It can be seen that although the total volume of the micropores is very small, their proportional length is very long, indicating that the number of micropores is much greater than that of macropores.

[0086] Depend on Fig.12 It can be seen that the surface area of ​​ordinary ammonium perchlorate (AP) without heating and decomposition is the external specific surface area of ​​the particles when they are piled up, and the specific surface area is 0.0264m 2 / g; the surface area of ​​porous ammonium perchlorate (PAP) after partial decomposition is composed of three parts: particle surface area, macropore surface area and micropore surface area, and the surface area of ​​macropores and micropores accounts for a higher proportion.

[0087] Depend on Fig.13 It can be seen that when ammonium perchlorate (AP) is partially decomposed, the surface area of ​​the particles becomes uneven, resulting in an increase in the specific surface area. For porous ammonium perchlorate (PAP) with a weight loss rate of 9.06%, 20.23% and 28.67%, the specific surface area increased by 3.16, 7.28 and 10.69 times, respectively. This can lead to an abnormal increase in the burning surface when combustion occurs, triggering a faster reaction.

[0088] In summary, the porous ammonium perchlorate prepared in Examples 2 to 4 has a rich, uniform, and interconnected pore structure, and the pore structure is composed of micron-scale macropores and nanometer-scale micropores. The rich macropore and micropore structure increases the specific surface area of ​​ammonium perchlorate and improves the application performance of ammonium perchlorate.

[0089] The pore structure evaluation of the porous ammonium perchlorate prepared in Examples 2 to 4 is shown in Table 1:

[0090] Table 1:

[0091] Example Weight loss rate Aperture <![CDATA[Specific surface area (m 2 / g)]]> Porosity Original ammonium perchlorate / / 0.0264 / Example 2 9.06％ 8nm~7μm 0.0834 8.46％ Example 3 20.23％ 8nm~7μm 0.1921 17.96％ Example 4 28.67％ 8nm~7μm 0.2822 26.58％

[0092] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A porous ammonium perchlorate having a pore size of 5 nm to 10 μm, a porosity of 1 to 30%, and a specific surface area of ​​0.05 to 0.35 m 2 / g.

2. The porous ammonium perchlorate according to claim 1, characterized in that: The porous ammonium perchlorate has a pore size of 8 nm to 7 μm, a porosity of 5 to 30%, and a specific surface area of ​​0.08 to 0.3 m 2 / g.

3. The porous ammonium perchlorate according to claim 2, characterized in that: The porosity of the porous ammonium perchlorate is 8-29%; the specific surface area is 0.09-0.29m 2 / g.

4. The method for preparing porous ammonium perchlorate according to any one of claims 1 to 3, comprising the following steps: Step 1, drying the ammonium perchlorate; Step 2: In a heating weight loss analysis device, the ammonium perchlorate of step 1 is heated to obtain porous ammonium perchlorate.

5. The method for preparing porous ammonium perchlorate according to claim 4, characterized in that: In the step 1, the particle size of the ammonium perchlorate is 80-120 meshes, and the purity is greater than 99%.

6. The method for preparing porous ammonium perchlorate according to claim 4, characterized in that: In the step 2, the heating rate is controlled to be 0.05 to 15°C / min, preferably 0.5 to 10°C / min, and particularly preferably 1 to 5°C / min.

7. The method for preparing porous ammonium perchlorate according to claim 4, characterized in that: In the step 2, the heating termination condition is: Condition 1: heating to 150-260°C, preferably to 200-240°C; or, Condition 2: Heating until the weight loss rate of ammonium perchlorate is greater than 0 and less than or equal to 30%.

8. The method for preparing porous ammonium perchlorate according to claim 4, characterized in that: In step 2, the heating weight loss analysis device includes a heating unit, a weighing unit, a temperature control unit and a detection unit; the heating unit is arranged around the weighing unit's scale pan; the temperature control unit is connected to the heating unit; and the detection unit is connected to the weighing unit.

9. The method for preparing porous ammonium perchlorate according to claim 8, characterized in that: A bracket is arranged on the upper part of the weighing unit, and the heating unit is arranged on the top of the bracket; a pillar is arranged on the weighing unit, and a weighing pan is placed on the top of the pillar; and the heating unit surrounds the weighing pan.

10. Use of the porous ammonium perchlorate according to any one of claims 1 to 3, wherein the porous ammonium perchlorate can be used for energetic materials, propellants, gas adsorption and separation materials, or materials for catalytic reactions.

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