Ternary transition-metal catalyst for ammonia borane hydrolysis and preparation method thereof

A transition metal and catalyst technology, applied in the field of ternary transition metal catalyst and its preparation, can solve the problems of high price, high production cost, difficult to realize industrialized production and the like

Inactive Publication Date: 2012-06-27
天津天环光伏太阳能有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the absence of a catalyst, the hydrolysis rate of ammonia borane is extremely slow, so finding a suitable catalyst to release the hydrogen energy in ammonia borane faster and sa

Method used

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  • Ternary transition-metal catalyst for ammonia borane hydrolysis and preparation method thereof
  • Ternary transition-metal catalyst for ammonia borane hydrolysis and preparation method thereof
  • Ternary transition-metal catalyst for ammonia borane hydrolysis and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh silver nitrate, cobalt acetate and nickel acetate according to the molar ratio Ag:Co:Ni=0.04:0:0.96 and mix them in a beaker, slowly add a solution of 1% PVP with a separating funnel, wherein the nitric acid The molar ratio of the mixture of silver, cobalt salt and nickel salt to polyvinylpyrrolidone PVP is 3:100, and it is fully dissolved by ultrasonication for 3 minutes to form a uniform solution; then add 0.2% ammonia borane in a mass percentage of the solution, Ultrasonic reaction for 30 minutes to complete the reaction; let the mixed liquid in the beaker stand still, pour off the supernatant, wash the solid at the bottom of the beaker with distilled water and ethanol three times, and dry it in an oven at 60°C to obtain a core-shell structure Ag 0.04 Ni 0..96 catalyst.

Embodiment 2

[0026] Weigh silver nitrate, cobalt chloride and nickel acetate according to the molar ratio Ag:Co:Ni=0.04:0.48:0.48 and mix them, place them in a beaker, add a PVP solution with a mass percentage of 1.5%, and a mass percentage of 0.25% ammonia Borane, wherein the mol ratio of the mixture of silver nitrate, cobalt salt and nickel salt to polyvinylpyrrolidone PVP is 3:150, and other preparation conditions are the same as embodiment 1, and obtain the Ag with core-shell structure 0.04 co 0.48 Ni 0..48 catalyst 。

Embodiment 3

[0028] Weigh silver nitrate, cobalt acetate and nickel sulfate according to the molar ratio Ag:Co:Ni=0.04:0.96:0 and mix them, put them in a beaker, add 2% PVP solution by mass percentage, and 0.3% ammonia boron alkane, wherein the molar ratio of the mixture of silver nitrate, cobalt salt and nickel salt to polyvinylpyrrolidone PVP is 3:200, and other preparation conditions are the same as in Example 1 to obtain Ag with core-shell structure. 0.04 co 0.96 catalyst.

[0029] The prepared above-mentioned catalyst is tested as follows for ammonia borane hydrolysis hydrogen release performance test and activation energy test:

[0030] Synthetic ternary transition metal catalyst Ag 0.04 Ni 0..96 、Ag 0.04 co 0.48 Ni 0..48 、Ag 0.04 co 0.96 Separately catalyze the hydrolysis of ammonia borane: take 10 mg of catalyst, 50 mg of ammonia borane, and 10 mg of sodium borohydride, mix them and place them at the bottom of a 25 ml round bottom flask, and place them in a water bath at 20...

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Abstract

The invention discloses a ternary transition-metal catalyst for ammonia borane hydrolysis and a preparation method thereof. The catalyst provided by the invention is a Ag0.04@CoxNi0.96-x(x=0-0.96) catalyst with a core-shell structure. According to the invention, ammonia borane is used as a reducing agent to directly reduce a mixed solution of silver nitrate, cobalt salt and nickel salt at different proportions to obtain the catalyst which is directly used for catalyzing ammonia borane hydrolysis. Due to the core-shell structure, the series of catalysts have high catalytic activity. By the adoption of the series of the catalysts for catalyzing ammonia borane hydrolysis at room temperature, the maximum hydrogen desorption rate can reach 1627.3 mlmin<-1>g<-1> and activation energy of the reaction is 28.54 kJmol<-1>. The core-shell structured ternary transition-metal catalyst has characteristics of small particle size, large specific surface area, many catalytic active sites and the like, is beneficial to catalytic hydrolysis of ammonia borane, has advantages of rich resources, low production cost and the like in comparison with a traditional noble metal catalyst, and is a promising catalyst.

Description

technical field [0001] The invention relates to a ternary transition metal catalyst used for the hydrolysis of ammonia borane and a preparation method thereof, belonging to the field of hydrogen storage materials. Background technique [0002] Energy is a powerful driving force to support the development of human society. However, with the rapid development of the global economy, traditional non-renewable energy sources such as coal and oil are increasingly scarce, and the ecological environment is gradually deteriorating. The worldwide energy crisis is becoming more and more serious. Development brings a lot of pressure. Human beings are increasingly aware of the importance of a green environment, therefore, the development of green new energy is of great significance. At present, the most promising development is hydrogen energy. There is a large amount of hydrogen energy stored in hydrides. How to release this energy is the key to the problem. At present, the hydrolysis...

Claims

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Application Information

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IPC IPC(8): B01J23/89C01B3/06
CPCY02E60/36
Inventor 宋大卫苏振馨郞平苏金风
Owner 天津天环光伏太阳能有限公司
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