A hydrogen production material with controllable hydrogen production rate and its preparation method

Abstract

This invention discloses a hydrogen production material with controllable hydrogen production rate and its preparation method. The hydrogen production material comprises the following components in parts by weight: 30-50 parts of metallic magnesium powder and 50-70 parts of M powder, wherein the M powder is boehmite, silicon dioxide, or magnesium oxide powder. The preparation method includes the following steps: (1) mixing metallic magnesium powder with a particle size of 1-1000 μm and M powder to obtain a mixed powder, wherein the M powder is boehmite, silicon dioxide, or magnesium oxide powder; (2) pressing the mixed powder into tablets to obtain the hydrogen production material. The powder material prepared by this invention is a high-efficiency hydrogen production material with the characteristics of slow-release hydrogen production, easy manufacturing, and low cost.

Description

Technical Field

[0001] This invention relates to the field of hydrogen production technology, specifically to a hydrogen production material with controllable hydrogen production rate and its preparation method. Background Technology

[0002] Existing materials for preparing hydrogen-rich water are primarily magnesium-based metals. However, without proper control of the magnesium powder, the reaction rate with water is too rapid and the reaction process is uncontrollable, resulting in a significant waste of both magnesium powder and hydrogen. For current Mg-based reactive hydrogen production powders, a crucial task is to achieve a slow and controllable release of hydrogen during the reaction with water. Furthermore, current technologies often simply mix metallic magnesium powder with ceramic powders (such as calcium carbonate, magnesium carbonate, or magnesium oxide), failing to effectively control the magnesium powder. Consequently, the initial hydrogen production rate and overall reaction time of the hydrogen production sheet material cannot be guaranteed, thus failing to meet the current requirements for hydrogen-rich water applications. Summary of the Invention

[0003] The purpose of this invention is to provide a hydrogen production material with controllable hydrogen production rate and its preparation method. The prepared powder material is a high-efficiency hydrogen production material with the characteristics of slow-release hydrogen production, easy manufacturing and low cost.

[0004] In one aspect of the invention, a hydrogen production material with controllable hydrogen production rate is proposed. According to an embodiment of the invention, the hydrogen production material comprises the following components in parts by weight: 30-50 parts of metallic magnesium powder and 50-70 parts of M powder, wherein the M powder is boehmite, silicon dioxide, or magnesium oxide powder.

[0005] In another aspect, the present invention provides a method for preparing a hydrogen-producing material with controllable hydrogen production rate. According to an embodiment of the present invention, the preparation method includes the following steps:

[0006] (1) Mix magnesium metal powder with a particle size of 1-1000μm and M powder to obtain a mixed powder, wherein M powder is boehmite, silicon dioxide or magnesium oxide powder.

[0007] (2) Compress the mixed powder into tablets to obtain the hydrogen production material.

[0008] In addition, the method for preparing a hydrogen-producing material with controllable hydrogen production rate according to the above embodiments of the present invention may also have the following additional technical features:

[0009] In some embodiments of the present invention, in step (1), the mixing is carried out by a batch feeding method, in which M powder is added to magnesium powder in three batches for mixing.

[0010] In some embodiments of the present invention, after the first batch of M powder is added, the mass percentage of magnesium powder in the mixed powder is 50%-60%; after the second batch of M powder is added, the mass percentage of magnesium powder in the mixed powder is 40%-50%; and after the third batch of M powder is added, the mass percentage of magnesium powder in the mixed powder is 35%-40%.

[0011] In some embodiments of the present invention, the batch mixing time is 12-24 hours.

[0012] In some embodiments of the present invention, in step (1), the powder is dry-mixed using a powder mixer.

[0013] In some embodiments of the present invention, the mixing machine rotates at a speed of 400-600 r / min.

[0014] In some embodiments of the present invention, in step (2), the pressure of the tablet is 200-250 MPa and the holding time is 30-60 s.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1) By mixing magnesium powder and M powder and then pressing them into sheets, the amount of hydrogen produced and the speed of hydrogen production can be determined by controlling the particle size and content of magnesium powder, the pressing pressure and holding time during the preparation process, thus creating a speed-controllable hydrogen powder material.

[0017] 2) The present invention adopts a batch feeding method, in which M powder is added to magnesium powder in batches for multiple mixing processes. By adding a large amount of M powder to magnesium powder, the aggregation of M powder can be effectively prevented, and the resulting mixed powder is more uniform.

[0018] 3) The smaller the magnesium powder particle size and the higher the content, the higher the hydrogen production capacity and hydrogen production rate; conversely, the larger the magnesium powder particle size, the lower the hydrogen production capacity and hydrogen production rate.

[0019] 4) During the pressing process, by controlling the pressure to adjust the porosity of the material, the rate at which the material reacts with water to produce hydrogen and the effective reaction time of the entire material can be effectively controlled.

[0020] 5) The hydrogen production powder material prepared by this invention has controllable speed, simple preparation method, strong operability and low cost. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] A method for preparing a hydrogen-producing material with controllable hydrogen production rate includes the following steps:

[0024] (1) Magnesium powder with a particle size of 10 μm and boehmite powder are mixed in a mass ratio of 40:60 using a powder mixer to obtain a mixed powder. The speed of the powder mixer is 400 r / min. Specifically, the boehmite powder is added to the magnesium powder in three batches for mixing. After adding the first batch of boehmite powder, the mass percentage of magnesium powder in the mixed powder is 60%. After adding the second batch of boehmite powder, the mass percentage of magnesium powder in the mixed powder is 50%. After adding the third batch of boehmite powder, the mass percentage of magnesium powder in the mixed powder is 40%. The mixing time for each batch is 12 h.

[0025] (2) After three steps of mixing, the magnesium powder and boehmite powder are fully mixed. Since the boehmite powder is in the form of flakes, it partially coats the surface of the magnesium powder during the mixing process.

[0026] (3) After mixing, the mixed powder is pressed into tablets. The pressing pressure is 250 MPa and the holding time is 60 s to obtain a round tablet with a diameter of 10 mm and a thickness of 5 mm, which is the hydrogen production tablet.

[0027] When the hydrogen-generating tablets obtained in this embodiment are placed in 500ml of water, the hydrogen content in the water reaches 800ppb within three minutes at a water temperature of 25°C, and remains stable within 30 minutes. At a water temperature of 50°C, the hydrogen content in the water reaches 800ppb within two minutes, and remains stable within 40 minutes.

[0028] Example 2

[0029] A method for preparing a hydrogen-producing material with controllable hydrogen production rate includes the following steps:

[0030] (1) Magnesium powder with a particle size of 5 μm and silicon oxide powder are mixed in a mass ratio of 50:50 using a powder mixer to obtain a mixed powder. The speed of the powder mixer is 400 r / min. Specifically, silicon oxide powder is added to magnesium powder in three batches for mixing. After adding the first batch of silicon oxide powder, the mass percentage of magnesium powder in the mixed powder is 70%. After adding the second batch of silicon oxide powder, the mass percentage of magnesium powder in the mixed powder is 60%. After adding the third batch of silicon oxide powder, the mass percentage of magnesium powder in the mixed powder is 50%. The mixing time for each batch is 24 h.

[0031] (2) After three steps of mixing, the magnesium powder and silicon oxide powder are fully mixed. Since silicon oxide is a highly dispersed powder, the silicon oxide powder partially coats the surface of the magnesium powder during the mixing process.

[0032] (3) After mixing, the mixed powder is pressed into tablets. The pressing pressure is 200 MPa and the holding time is 60 s to obtain a round tablet with a diameter of 12 mm and a thickness of 6 mm, which is the hydrogen production tablet.

[0033] The obtained hydrogen-generating tablets were placed in 500ml of water at a water temperature of 25℃. Within two minutes, the hydrogen content in the water reached 700ppb, and within 25 minutes, the hydrogen content in the water remained stable.

[0034] Example 3

[0035] The difference between the preparation method of the hydrogen production material with controllable hydrogen production rate in this embodiment and that in embodiment 2 is step (3). In this embodiment, step (3) includes the following steps: pressing the mixed powder into a sheet, the pressing pressure is 150 MPa, the holding time is 90 s, and a round sheet with a diameter of 12 mm and a thickness of 6 mm is obtained, which is the hydrogen production sheet.

[0036] When the obtained hydrogen-generating tablets were placed in 500ml of water at a water temperature of 25℃, the hydrogen content in the water reached 700ppb within one minute and remained stable for 25 minutes.

[0037] Example 4

[0038] The difference between the preparation method of the hydrogen production material with controllable hydrogen production rate in this embodiment and that in embodiment 2 is step (3). In this embodiment, step (3) includes the following steps: pressing the mixed powder into a sheet, the pressing pressure is 250 MPa, the holding time is 120 s, and a round sheet with a diameter of 12 mm and a thickness of 6 mm is obtained, which is the hydrogen production sheet.

[0039] The obtained hydrogen-generating tablets were placed in 500ml of water at a water temperature of 25℃. Within five minutes, the hydrogen content in the water reached 700ppb, and the hydrogen content in the water remained stable for 60 minutes.

[0040] Example 5

[0041] A method for preparing a hydrogen-producing material with controllable hydrogen production rate includes the following steps:

[0042] (1) Magnesium metal powder and magnesium oxide powder with a particle size of 20 μm are mixed in a mass ratio of 35:75 using a powder mixer to obtain a mixed powder. The speed of the powder mixer is 400 r / min. Specifically, magnesium oxide powder is added to magnesium powder in three batches for mixing. After adding the first batch of magnesium oxide powder, the mass percentage of magnesium powder in the mixed powder is 55%. After adding the second batch of magnesium oxide powder, the mass percentage of magnesium powder in the mixed powder is 45%. After adding the third batch of magnesium oxide powder, the mass percentage of magnesium powder in the mixed powder is 35%. The mixing time for each batch is 12 h.

[0043] (2) After three steps of mixing, the magnesium metal powder and magnesium oxide powder are fully mixed. Since magnesium oxide is in a highly dispersed powder form, the magnesium oxide powder partially coats the surface of the magnesium metal powder during the mixing process.

[0044] (3) After mixing, the mixed powder is pressed into tablets. The pressing pressure is 50 MPa and the holding time is 30 s to obtain a round tablet with a diameter of 15 mm and a thickness of 6 mm, which is the hydrogen production tablet.

[0045] The obtained hydrogen-generating tablets were placed in 800ml of water at a water temperature of 25℃. Within one minute, the hydrogen content in the water reached 900ppb, and the hydrogen content in the water remained stable for 20 minutes.

[0046] Example 6

[0047] The difference between the preparation method of the hydrogen production material with controllable hydrogen production rate in this embodiment and that in embodiment 5 is step (3). In this embodiment, step (3) includes the following steps: after mixing, the mixed powder is pressed into a sheet with a pressing pressure of 150 MPa and a holding time of 60 s to obtain a round sheet with a diameter of 15 mm and a thickness of 6 mm, which is the hydrogen production sheet.

[0048] The obtained hydrogen-generating tablets were placed in 800ml of water at a water temperature of 25℃. Within three minutes, the hydrogen content in the water reached 900ppb, and the hydrogen content in the water remained stable for 40 minutes.

[0049] Example 7

[0050] The difference between the preparation method of the hydrogen production material with controllable hydrogen production rate in this embodiment and that in embodiment 5 is step (3). In this embodiment, step (3) includes the following steps: after mixing, the mixed powder is pressed into a sheet with a pressing pressure of 250 MPa and a holding time of 90 s to obtain a round sheet with a diameter of 15 mm and a thickness of 6 mm, which is the hydrogen production sheet.

[0051] The obtained hydrogen-generating tablets were placed in 800ml of water at a water temperature of 25℃. Within five minutes, the hydrogen content in the water reached 900ppb, and the hydrogen content in the water remained stable for 60 minutes.

[0052] The basic performance of this water-based hydrogen production material is shown in Table 1. In 500 ml of water, this material can generate hydrogen gas within 1-3 minutes, reaching a hydrogen content of approximately 700-900 ppb, and maintain this hydrogen content for 20-50 minutes. Within this timeframe, the water pH remains between 7 and 9, exhibiting low alkalinity that meets human drinking water standards, while the TDS level remains stable at 150-300 ppm.

[0053] Table 1. Performance of magnesium-based hydrogen production materials prepared under different conditions.

[0054]

[0055]

[0056] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the present invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A method for preparing a hydrogen production material with controllable hydrogen production rate, characterized in that, Includes the following steps: (1) Mix magnesium powder with a particle size of 1-1000μm and M powder to obtain a mixed powder, wherein M powder is boehmite, silicon dioxide or magnesium oxide powder, the weight of magnesium powder is 30-50 parts and the weight of M powder is 50-70 parts; the mixing adopts the batch feeding method, and M powder is added to magnesium powder in three batches for mixing operation. After adding the first batch of M powder, the mass percentage of magnesium powder in the mixed powder is 50%-60%, after adding the second batch of M powder, the mass percentage of magnesium powder in the mixed powder is 40%-50%, and after adding the third batch of M powder, the mass percentage of magnesium powder in the mixed powder is 35%-40%. The mixing time for each batch is 12-24h. (2) The mixed powder is compressed into tablets to obtain the hydrogen production material.

2. The method for preparing a hydrogen production material with controllable hydrogen production rate according to claim 1, characterized in that: In step (1), the powder is dry-mixed using a powder mixer.

3. The method for preparing a hydrogen production material with controllable hydrogen production rate according to claim 2, characterized in that: The speed of the powder mixer is 400-600 r / min.

4. The method for preparing a hydrogen production material with controllable hydrogen production rate according to claim 1, characterized in that: In step (2), the tableting pressure is 200-250 MPa and the holding time is 30-60 s.

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