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Ca-B-H hydrogen storing material catalyzed by metal oxide and preparation method thereof

A technology of hydrogen storage materials and oxides, which is applied in the production of hydrogen, etc., can solve the problems of reduced hydrogen storage capacity, unobvious catalytic effect of catalysts, and reduced reaction rate, and achieve lower hydrogen release temperature, excellent catalytic activity, absorption and release The effect of increasing the hydrogen rate

Inactive Publication Date: 2013-04-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalytic effect of the above catalysts is not obvious
After adding the above catalyst, although the initial hydrogen desorption temperature of the sample decreased, due to the metal halide and Ca(BH 4 ) 2 A strong reaction occurs, and a large amount of hydrogen is released during the reaction, which makes the actual hydrogen storage capacity of the system significantly reduced, and the reaction rate is also reduced

Method used

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  • Ca-B-H hydrogen storing material catalyzed by metal oxide and preparation method thereof
  • Ca-B-H hydrogen storing material catalyzed by metal oxide and preparation method thereof
  • Ca-B-H hydrogen storing material catalyzed by metal oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In an argon atmosphere glove box, the Ca(BH 4 ) 2 With TiO, Ti 2 O 3 , TiO 2 , V 2 O 5 , Nb 2 O 5 , Fe 2 O 3 , CoO, Co 2 O 3 , Co 3 O 4 Or CuO is mixed in molar ratios of 1:0.05, 1:0.1 and 1:0.2, put into a stainless steel tank with grinding balls, and solid-state ball milling is performed with argon protection. The ball-to-material ratio is 120:1, the ball milling speed is 500 rpm, and the ball milling time is 3 h. Table 1 shows Ca(BH 4 ) 2 The initial temperature and amount of hydrogen evolution of the sample mixed with different metal oxides in different molar ratios. It can be seen from the data in the table that the hydrogen desorption temperature of all the above samples is around 300 ℃, and the hydrogen desorption amount is above 6 wt%. figure 1 Ca(BH 4 ) 2 -0.2Fe 2 O 3 The hydrogen release curve. It can be seen from the figure that the initial hydrogen release temperature of the sample is about 290 ℃, which is relatively pure Ca(BH 4 ) 2 The sample is lowered by ...

Embodiment 2

[0038] In an argon atmosphere glove box, the Ca(BH 4 ) 2 With TiO, Ti 2 O 3 , TiO 2 , V 2 O 5 , Nb 2 O 5 , Fe 2 O 3 , CoO, Co 2 O 3 , Co 3 O 4 Grind and mix with CuO at a molar ratio of 1:0.1. Table 2 shows Ca(BH 4 ) 2 The amount of hydrogen released by the sample mixed with different metal oxides at a molar ratio of 1:0.1 at 270 ℃. The results show that all samples can release more than 5.0 wt% hydrogen when kept at 270 ℃. figure 2 Is Ca(BH 4 ) 2 -0.1TiO 2 The isothermal hydrogen release curve of the sample at 270 ℃. It can be seen from the figure that the amount of hydrogen released by the sample exceeds 4 wt% in 700 min, while pure Ca(BH 4 ) 2 The sample released less than 1 wt% hydrogen at the same time.

[0039] sample Hydrogen release amount (wt%) Ca(BH 4 ) 2 -0.1TiO 5.8 Ca(BH 4 ) 2 -0.1Ti 2 O 3 5.5 Ca(BH 4 ) 2 -0.1TiO 2 5.0 Ca(BH 4 ) 2 -0.1V 2 O 5 5.0 Ca(BH 4 ) 2 -0.1Nb 2 O 5 5.0 Ca(BH 4 ) 2 -0.1Fe 2 O 3 5.1 Ca(BH 4 ) 2 -0.1CoO 5.4 Ca(BH 4 ) 2 -0.1Co 2 O 3 5.3 Ca(BH 4...

Embodiment 3

[0041] In an argon atmosphere glove box, the Ca(BH 4 ) 2 With 0.05TiO+0.05Ti 2 O 3 , 0.05TiO 2 +0.05V 2 O 5 , 0.05Nb 2 O 5 +0.05Fe 2 O 3 , 0.05CoO+0.05Co 2 O 3 , 0.05Co 3 O 4 +0.05CuO, 0.05TiO+0.05Ti 2 O 3 +0.05TiO 2 , 0.05V 2 O 5 +0.05Nb 2 O 5 +0.05Fe 2 O 3 And 0.05CoO+0.05Co 2 O 3 +0.05Co 3 O 4 Use mechanical stirring to mix.

[0042] The initial temperature of the main hydrogen release of the above samples is relatively pure Ca (BH 4 ) 2 Both are significantly reduced.

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Abstract

The invention relates to a Ca-B-H hydrogen storing material catalyzed by a metal oxide and a preparation method thereof. The Ca-B-H hydrogen storing material catalyzed by the metal oxide is characterized in that the hydrogen storing material is formed by the following elements shown as the specification, wherein the metal M is a transition metal element; x is more than or equal to 0.02 and less than or equal to 0.5; y is a valence of the metal M; and z is more than or equal to 4 and less than or equal to 8. The Ca-B-H hydrogen storing material catalyzed by the metal oxide and the preparation method thereof disclosed by the invention have the advantages that a metal oxide catalyst which is in-situ introduced by reaction of a Ca-B-H compound and a metal organic compound is utilized, the grain size is small and the dispersity of a hydrogen storing material base body is high; the catalytic activity is more excellent and the hydrogen sucking and releasing performance of the Ca-B-H hydrogen storing material is further improved; meanwhile, with the regard to some liquid-state metal organic compounds, the metal oxide catalyst is reacted with Ca(BH4)2 to generate a metal oxide catalyst in situ and prepare a porous Ca-B-H hydrogen storing material; and the hydrogen storing capacity is more than 6wt%, the temperature for sucking and releasing hydrogen is obviously reduced, and the hydrogen sucking and releasing speed is obviously improved.

Description

technical field [0001] The invention relates to the field of hydrogen storage materials, in particular to a Ca-B-H hydrogen storage material catalyzed by metal oxides and a preparation method thereof. Background technique [0002] With the rapid development of society and economy, human's demand for energy continues to increase. However, facing the dual pressures of the increasing scarcity of traditional fossil fuels and the deterioration of the ecological environment, it has become a global consensus to develop a new energy system that uses hydrogen as an energy carrier. Especially with the development of fuel cell technology, more and more attention has been paid to using hydrogen as vehicle fuel. In the development of hydrogen energy system technology, hydrogen storage technology is considered to be a crucial aspect. Among them, solid-state hydrogen storage in light metal borohydrides has great development and application prospects due to its high mass hydrogen storage ...

Claims

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Application Information

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IPC IPC(8): C01B3/02
Inventor 高明霞顾坚潘洪革刘永锋
Owner ZHEJIANG UNIV