Method for producing magnesium hydride and method for producing tetrahydroborate

Patent metadata

Field	Value
Publication number	US-11542160-B2
Application number	US-202016999621-A
Country	US
Kind code	B2
Filing date	Aug 21, 2020
Priority date	Aug 29, 2019
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

Provided is a method for producing magnesium hydride, the method including a plasma treatment step of exposing a raw material mixture of at least one magnesium-based raw material selected from the group consisting of magnesium, magnesium hydroxide, and magnesium oxide and magnesium hydride to hydrogen plasma.

First claim

What is claimed is:

1. A method for producing magnesium hydride, the method comprising a plasma treatment step of exposing a raw material mixture of (i) at least one magnesium-based raw material selected from the group consisting of magnesium, magnesium hydroxide, and magnesium oxide, and (ii) magnesium hydride to hydrogen plasma.

2. The production method according to claim 1 , wherein the plasma treatment step is performed while heating the raw material mixture.

3. The production method according to claim 1 , wherein the plasma treatment step is performed while fluidizing the raw material mixture.

4. The production method according to claim 1 , wherein the plasma treatment step is performed while supplying a thermal electron.

5. The production method according to claim 1 , wherein a mass ratio of the magnesium hydride to a mass of the magnesium-based raw material is 1/1000 to 1/1.

6. The production method according to claim 1 , further comprising a raw material mixture preparation step of obtaining the raw material mixture by mixing the magnesium-based raw material and the magnesium hydride before the plasma treatment step.

7. A method for producing tetrahydroborate, the method comprising:
a magnesium hydride production step of exposing a raw material mixture of (i) at least one magnesium-based raw material selected from the group consisting of magnesium, magnesium hydroxide, and magnesium oxide, and (ii) magnesium hydride to hydrogen plasma; and
a mechanochemical treatment step of subjecting an object to be treated containing borate and the magnesium hydride obtained by the magnesium hydride production step to a mechanochemical treatment.

8. The production method according to claim 7 , wherein the mechanochemical treatment step is performed by using a medium stirring mill.

9. The production method according to claim 7 , wherein the borate is sodium metaborate.

10. A method for producing tetrahydroborate, the method comprising:
a magnesium hydride production step of exposing a raw material mixture of (i) at least one magnesium-based raw material selected from the group consisting of magnesium, magnesium hydroxide, and magnesium oxide, and (ii) magnesium hydride to hydrogen plasma; and
a treatment step of subjecting an object to be treated containing borate and the magnesium hydride obtained by the magnesium hydride production step to a thermal treatment under conditions including a temperature of 350° C. or higher and an absolute pressure of 0.2 MPa or more.

11. A method for producing tetrahydroborate, the method comprising:
a magnesium hydride production step of exposing a raw material mixture of (i) at least one magnesium-based raw material selected from the group consisting of magnesium, magnesium hydroxide, and magnesium oxide, and (ii) magnesium hydride to hydrogen plasma; and
a plasma treatment step of exposing a mixture of borate and the magnesium hydride obtained by the magnesium hydride production step to hydrogen plasma or inert gas plasma.

12. The production method according to claim 11 , wherein the hydrogen plasma is generated by using a source gas containing at least one of hydrogen gas and hydrocarbon gas.

13. The production method according to claim 11 , wherein the inert gas plasma is generated by using a source gas containing at least one selected from the group consisting of nitrogen gas, argon gas, helium gas, and neon gas.

14. The production method according to claim 11 , wherein the hydrogen plasma and the inert gas plasma is microwave plasma or RF plasma.

15. The production method according to claim 11 , further comprising a preheating step of heating the mixture before the plasma treatment step.

16. The production method according to claim 11 , wherein the plasma treatment step is performed while heating the mixture.

17. The production method according to claim 11 , wherein the plasma treatment step is performed while fluidizing the mixture.

18. The production method according to claim 11 , wherein an average particle size of the borate is 500 μm or less.

19. The production method according to claim 11 , wherein the borate is sodium metaborate.

20. A method for producing tetrahydroborate, the method comprising:
a magnesium hydride production step of exposing a raw material mixture of (i) at least one magnesium-based raw material selected from the group consisting of magnesium, magnesium hydroxide, and magnesium oxide, and (ii) magnesium hydride to hydrogen plasma; and
a thermal treatment step of heating a mixture of borate and the magnesium hydride obtained by the magnesium hydride production step to 350° C. or higher in a gas atmosphere containing hydrogen (H) as a constituent element.

21. The production method according to claim 20 , wherein the thermal treatment step is performed while fluidizing the mixture.

22. The production method according to claim 20 , wherein an average particle size of the borate is 500 μm or less.

23. The production method according to claim 20 , wherein the borate is sodium metaborate.

Assignees

• Sintokogio Ltd
• Univ Shizuoka Nat Univ Corp

Inventors

• Nagasaka Masahiko
• Ishida Tomoji
• Uchiyama Akiomi
• Haga Yasutaka
• Ogino Akihisa

Classifications

• C01B6/04 Primary

  Hydrides of alkali metals, alkaline earth metals, beryllium or magnesium; Addition complexes thereof · CPC title

• Y02E60/32

  Hydrogen storage · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C01B6/17

  Preparation from boron or inorganic compounds containing boron and oxygen · CPC title

• C01B3/0026

  Metals or metal hydrides · CPC title