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Method for increasing aluminum-containing complex compound hydrogen-storing material circulation stability

A technology of cycle stability and hydrogen storage materials, applied in the production of hydrogen, etc., can solve the problems of hindering the potential performance of materials, the reduction of effective hydrogen storage capacity, and the agglomeration of particles, and achieve the effect of low cost and simple method

Inactive Publication Date: 2008-09-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first disadvantage is the addition of NaAlH containing Ti catalyst 4 The hydrogen reabsorption process requires higher hydrogen pressure (greater than 10MPa) reaction conditions
The second disadvantage is that the NaAlH prepared by this method 4 After dehydrogenation, the particles will agglomerate, and at the same time, by-products such as Ti-Al will be generated, resulting in a decrease in the effective hydrogen storage capacity as the hydrogen absorption and desorption cycle proceeds.
These two shortcomings not only hinder the potential performance of the material, but also bring certain limitations to practical applications.

Method used

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  • Method for increasing aluminum-containing complex compound hydrogen-storing material circulation stability
  • Method for increasing aluminum-containing complex compound hydrogen-storing material circulation stability
  • Method for increasing aluminum-containing complex compound hydrogen-storing material circulation stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of nano-sized NaAlH with good cycle stability 4 ,Specific steps are as follows:

[0029] (1) Equipped with NaAlH 4 the solution

[0030] At room temperature and under the protective atmosphere of inert gas nitrogen or argon, accurately weigh 1 gram of aluminum-containing nano-complex hydride NaAlH 4 powder and 99 g THF, then NaAlH 4 Add the powder into tetrahydrofuran, stir well until it is completely dissolved, and obtain NaAlH with a mass content of 1%. 4 solution.

[0031] (2) NaAlH 4 Solution dropwise infiltration into mesoporous SiO 2

[0032] With the NaAlH obtained by step (1) 4 The solution was added dropwise to mesoporous SiO with a pore diameter of 5-10 nm 2 Powder, infiltrate at 40-50°C for 1-2 hours, add solution 3-6 times and keep warm to make NaAlH 4 into the tunnel.

[0033] (3) will be permeated with NaAlH multiple times 4 The sample was dried under vacuum for 24-48 hours to obtain nano-sized NaAlH filled in the pores of the porou...

Embodiment 2

[0039] NaAlH 4 For example, figure 2 The curves of dehydrogenation amount and dehydrogenation time were compared at the same temperature of 150°C for 1 hour. It can be seen from the figure that, under the condition of lower dehydrogenation temperature without adding any catalyst, the usual NaAlH 4 The sample hardly releases hydrogen, while the prepared mesoporous SiO 2 Nanosized NaAlH in matrix pores 4 There was 2.0 wt% hydrogen evolution.

Embodiment 3

[0041] NaAlH 4 For example, image 3 Comparing the hydrogen absorption and desorption cycle under the same conditions, the curves of the amount of hydrogen released by the sample and the number of cycles, it can be seen from the figure that, without adding any catalyst, the prepared mesoporous SiO 2 Nanosized NaAlH in matrix pores 4 , has very good cycle stability, in which after 50 hydrogen absorption and desorption cycles, the hydrogen desorption capacity remains at 90% of the theoretical capacity, while the conventional NaAlH 4 Only about 40%.

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Abstract

The invention belongs to the functional material technical field, in particular to a method for improving the circulatory stability of aluminiferous complex hydrogen storage materials. The method comprises the following steps that: aluminiferous complex hydrogen storage materials MA1H4(M represents Li, Na or K) are dissolved in a solvent, and the generated MA1H4 solution is loaded in a porous channel of a porous matrix by the infiltration technique, wherein the porous matrix is of porous materials such as meso-porous materials(SiO2), meso-porous materials(Al2O3), porous carbon, meso-porous carbon or zeolite; and the MA1H4 solution has the solution removed by drying, obtaining the nano sized MA1H4 which is filled in the porous channel of the porous matrix; the nano sized MA1H4 hydrogen storage materials are good in absorb-release hydrogen circulatory stability. The method is simple and low in cost, and high in commercial value for preparing hydrogen storage materials with high circulatory stability .

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a method for improving the cycle stability of aluminum-containing complex hydrogen storage materials. The prepared hydrogen storage material provides the hydrogen source for the fuel cell. Background technique [0002] Under the dual pressure of increasingly scarce fossil fuel resources and deteriorating ecological environment, the development of clean and renewable energy technologies using hydrogen as an energy carrier has become a global consensus. Therefore, the development and utilization of new energy technologies related to hydrogen has been listed as a key research content by many countries. Important achievements in some fields, such as fuel cells and electric vehicles, are also developing towards industrialization. It is foreseeable that the world's energy economic structure will also undergo revolutionary changes, that is, from a carbon-based energy econ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 孙大林郑时有方方陈国荣
Owner FUDAN UNIV
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