Preparation method of modified silicon gel absorbing agent used for protecting on-vehicle fuel batteries

A silica gel adsorption and fuel cell technology, which is used in fuel cell additives, solid electrolyte fuel cells, battery/battery traction, etc. Good ability to adsorb trace sulfur dioxide, easy operation, mild conditions

Inactive Publication Date: 2010-10-13
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these adsorbents are mostly used in high SO content 2 For the removal of sulfur dioxide, the adsorption research on trace sulfur dioxide is still seldom carried out, and the research on the technology of sulfur dioxide removal from road air with vehicle-mounted fuel cells is still in its infancy
However, these adsorbents mostly work under high temperature or high pressure, and are not suitable for the working requirements of vehicle-mounted fuel cells at normal temperature and pressure.

Method used

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  • Preparation method of modified silicon gel absorbing agent used for protecting on-vehicle fuel batteries
  • Preparation method of modified silicon gel absorbing agent used for protecting on-vehicle fuel batteries
  • Preparation method of modified silicon gel absorbing agent used for protecting on-vehicle fuel batteries

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Experimental program
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Effect test

Embodiment 1

[0016] (1) According to the ratio of 2.15: 3.8: 1: 0.033 by mass ratio, tetraethoxysilane, absolute ethanol, deionized water and HCl solution with a concentration of 0.05mol / l were added in the round bottom flask successively, stirred, React for 1 day to obtain a transparent and clear sol precursor;

[0017] (2) Take a certain amount of the sol precursor prepared in step (1), without diluting with absolute ethanol, quickly drop in 3-aminopropyltriethoxysilane whose mass is 11% of the sol precursor mass, and stir for 5 seconds A transparent solid gel was obtained. After the solid gel was aged for 0.5 h, it was crushed, placed in an oven and dried at 80°C for 1 day, and the dried silica gel particles were uniformly ground to obtain the amino-modified silica gel adsorbent.

[0018] The obtained dried gel has low strength and can be easily ground into a powder adsorbent, and the product has a good ability to adsorb trace amounts of sulfur dioxide. The specific surface area of ​​...

Embodiment 2

[0021] (1) According to the ratio of 2.15: 3.8: 1: 0.033 by mass ratio, tetraethoxysilane, absolute ethanol, deionized water and HCl solution with a concentration of 0.05mol / l were added in the round bottom flask successively, stirred, After 14 days of reaction, a transparent and clear sol precursor was obtained;

[0022] (2) Take a certain amount of the sol precursor obtained in step (1), add the dehydrated ethanol whose quality is 3 times of the sol quality to dilute, and quickly drop in the 3-aminopropyl triethoxy that the quality is 33% of the sol precursor quality base silane, and stirred for 1 min to obtain a transparent solid gel. After the solid gel was aged for 3 hours, it was crushed, placed in an oven and dried at 50°C for 3 days, and the dried silica gel particles were uniformly ground to obtain the amino-modified silica gel adsorbent.

[0023] The obtained dry gel strength is similar to that of the product in Example 1.

Embodiment 3

[0025] (1) According to the ratio of 2.15: 3.8: 1: 0.033 by mass ratio, tetraethoxysilane, absolute ethanol, deionized water and HCl solution with a concentration of 0.05mol / l were added in the round bottom flask successively, stirred, React for 1 day to obtain a transparent and clear sol precursor;

[0026] (2) Take a certain amount of the sol precursor obtained in step (1), add the dehydrated ethanol whose quality is 3 times of the sol quality to dilute, and quickly drop in the 3-aminopropyl triethoxy that the quality is 11% of the sol precursor quality base silane, a transparent solid gel can be obtained under stirring. After the solid gel was aged for 0.5 h, it was crushed, placed in an oven and dried at 80°C for 3 days, and the dried silica gel particles were uniformly ground to obtain the amino-modified silica gel adsorbent.

[0027] The obtained silica gel adsorbent is similar to that of Example 1. It has a good ability to adsorb trace amounts of sulfur dioxide, has a ...

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Abstract

The invention relates to a preparation method of a kind of modified silicon gel absorbing agent used for protecting on-vehicle fuel batteries, which belongs to the branch of the non-metallic inorganic material technology and is applied to the field of gas absorption and separation. The preparation method uses 3-aminopropyl triethoxysilane as amino modifying agents, uses tetraethoxy silane as silicon gel precursors, and prepares and obtains modified silicon gel with uniformly decorated amino groups in a porous silicon gel framework through adding a certain number of amino modifying agents in the gel forming stage. The absorbing agent can be used for removing a trace amount of sulfur dioxide in the air, so cathodic catalysts of on-vehicle proton exchange membrane fuel batteries are protected from the poisoning effect of the sulfur dioxide. Compared with the prior art, the invention has the following advantages that: (1) the obtained absorbing agent has better capability for absorbing the trace amount of sulfur dioxide than active carbon fiber, the effect is shown through longer penetrating time and larger saturation adsorption capacity, in addition, the absorbing agent still has good absorbing capability when the humidity is lower; and (2) the obtained absorbing agent has simple and convenient preparation method, the operation is easy, the condition is mild, and the effects of energy saving and environment protection can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a modified silica gel adsorbent for protecting vehicle-mounted fuel cells, belongs to the branch of inorganic non-metallic material science and technology, and is applied in the field of gas adsorption and separation. Background technique [0002] Fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy in the form of electrochemical reaction. It has the advantages of high energy conversion efficiency, no pollution, and low noise. It is recognized as the preferred clean and efficient power generation technology in the 21st century. Among them, the proton exchange membrane fuel cell is the fifth-generation fuel cell, because of its outstanding advantages such as high energy conversion efficiency, rapid start-up at room temperature, and high specific power, it has broad applications in electric vehicles, portable electronic equipment, fixed power stati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B60L11/18H01M8/04H01M8/10
CPCB60L11/1879Y02T10/705Y02E60/50Y02T10/7005B60L50/64Y02T10/70
Inventor 邱介山万鹏
Owner DALIAN UNIV OF TECH
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