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Catalyst of sodium aluminum hydride complex hydride and preparation method thereof

A technology of coordinating hydride and sodium aluminum hydride, applied in the field of hydrogen storage materials, can solve problems such as restricting practical application, reducing catalytic activity, affecting hydrogen absorption and desorption kinetics, etc. The effect of improving the kinetics of hydrogen absorption and desorption

Inactive Publication Date: 2011-07-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some scholars use elemental metal powder or metal hydride as a catalyst to add NaAlH 4 In the system, the generation of inert by-products is avoided, but the catalytic activity of elemental metal powder or other metal compounds is significantly lower than that of transition metal compounds such as Ti and Ce, which seriously affects the hydrogen absorption and desorption kinetics of the system, restricting its practical performance. application

Method used

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  • Catalyst of sodium aluminum hydride complex hydride and preparation method thereof
  • Catalyst of sodium aluminum hydride complex hydride and preparation method thereof
  • Catalyst of sodium aluminum hydride complex hydride and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] with CeAl 4 Alloy powder is used as catalyst, and NaH and Al powder are used as matrix materials to prepare CeAl 4 Doped NaAlH 4 Hydrogen storage material.

[0020] The raw materials used are: NaH (purity 95%, ~200 mesh), Al powder (purity greater than 99.9%, ~200 mesh), metal Ce block (purity greater than 99.9%), metal Al block (purity greater than 99.9%). Raw materials are used directly without treatment.

[0021] 1) CeAl 4 Preparation of Alloy Powder Catalyst

[0022] Take metal Ce block and Al block according to the molar ratio of 1:4, and induction melt them into CeAl under the protection of argon. 4 Alloy ingots; then mechanically pulverized to less than 100 mesh; then the mechanically pulverized alloy particles were placed in a stainless steel ball mill tank, filled with 0.6MPa hydrogen gas, and ball milled on a high-energy ball mill for 10 hours to obtain a particle size of micronano Grade CeAl 4 powder catalyst.

[0023] 2) CeAl 4 Powder catalyst for N...

Embodiment 2

[0028] SmAl 3 Alloy powder as catalyst, NaAlH 4 Powder is used as matrix material to prepare SmAl 3 Doped NaAlH 4 Hydrogen storage material.

[0029] The raw material used is: NaAlH 4 (purity 95%, ~200 mesh), metal Sm block (purity greater than 99.9%), metal Al block (purity greater than 99.9%). Raw materials are used directly without treatment.

[0030] 1) SmAl 3 Preparation of Alloy Powder Catalyst

[0031] Take metal Sm block and Al block according to the molar ratio of 1:3, and induction melt them into SmAl under the protection of argon. 3 Alloy ingots; then mechanically pulverized to below 100 mesh; then the mechanically pulverized particles are placed in a stainless steel ball mill tank, filled with 0.3MPa argon gas in the ball mill tank, and ball milled on a high-energy ball mill for 20 hours to obtain a particle size of micronano Grade SmAl 3 powder catalyst.

[0032]2) SmAl 3 Alloy powder catalyst for NaAlH 4 Preparation of hydrogen storage materials

[0...

Embodiment 3

[0037] to La 3 al 11 Alloy powder is used as catalyst, and NaH and Al powder are used as matrix materials to prepare La 3 al 11 Doped NaAlH 4 Hydrogen storage material.

[0038] The raw materials used are: NaH (purity 95%, ~200 mesh), Al powder (purity greater than 99.9%, ~200 mesh), metal La block (purity greater than 99.9%), metal Al block (purity greater than 99.9%). Raw materials are used directly without treatment.

[0039] 1) La 3 al 11 Preparation of Alloy Powder Catalyst

[0040] According to the molar ratio of 3:11, the metal La block and Al block are taken, and induction melting is carried out under the protection of argon to form La 3 al 11 alloy ingot. After that, mechanically pulverize to below 100 mesh, put the mechanically pulverized particles in a stainless steel ball mill tank, and fill the ball mill tank with 1.5MPaH 2 , milled on a planetary ball mill for 30 hours to obtain La 3 al 11 catalyst.

[0041] 2) La 3 al 11 Alloy powder catalyst for...

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Abstract

The invention relates to a catalyst of sodium aluminum hydride coordination oxide and a preparation method thereof. A chemical general formula of the catalyst is RExAly, wherein x is smaller than 10 but larger than or equal to 1, and y is smaller than 20 but larger than or equal to 1. In the formula, the RE is Sc, Y, La, Ce, Pr, Sm, Nd, Ml (lanthanum-rich mixed tombarthite) or Mm (cerium-rich mixed tombarthite). The preparation method is as follows: according to a chemical amount proportion of the RExAly, RE and the Al block-shaped metal raw materials are weighed and proportionally mixed; the raw materials are then melted into an RExAly alloy cast ingot under an argon protection atmosphere and then crushed and put into a high-power ball mill for ball milling; and then the RExAly catalyst with a particle size of micro-nanometer level is obtained. The preparation process of the catalyst is simple, the operation is easy, and the cost is low. The catalyst is used for reversible catalysis hydrogen storage of sodium aluminum hydride, greatly improves the dynamic performance of the sodium aluminum hydride in terms of hydrogen absorption and release and does not undergo elementary reaction with a matrix hydrogen storage material group to generate inert byproducts so that the system reversible hydrogen storage amount is not damaged.

Description

technical field [0001] The invention relates to a catalyst of sodium aluminum hydride coordination hydride, a preparation method thereof and an application in sodium aluminum hydride reversible hydrogen storage, belonging to the field of hydrogen storage materials. Background technique [0002] Energy is the source of human development. Facing the dual pressure of increasing scarcity of oil resources and deterioration of the ecological environment, it has become a global consensus to use hydrogen energy, a clean energy source, to replace existing energy sources based on fossil fuels. The technological progress and marketization of hydrogen-fueled proton exchange membrane fuel cells and electric vehicles have further promoted the research and development of hydrogen energy system technology. In the hydrogen energy system technology chain, hydrogen storage technology is considered to be a key link. Recently, Bogdanovic B et al found that in NaAlH 4 Doped with Ti, Ce and othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J21/02C22C1/02B22D23/00B22F9/04C01B3/02
Inventor 陈立新范修林肖学章吴哲陈长聘王启东
Owner ZHEJIANG UNIV
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