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Load type CoB catalyst for process of preparing hydrogen through hydrolysis of sodium borohydride and preparation method of load type CoB catalyst

A technology for producing hydrogen and sodium borohydride by hydrolysis, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problem of unsatisfactory stability and reusability, The weak binding force between the active component and the carrier, the decline of catalyst activity, etc., achieve the effect of good reusability, good dispersibility, and catalytic activity retention

Active Publication Date: 2013-03-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited stability of the above-mentioned carrier in a strong alkaline system, the dissolution of part of the carrier will destroy the structure of the catalyst, resulting in the detachment and loss of active components.
In addition, the supported CoB catalyst prepared by the traditional impregnation loading method has a weak binding force between the active component and the support, so the activity of the catalyst decreases rapidly during the reaction process, and the stability and reusability are still not ideal.

Method used

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  • Load type CoB catalyst for process of preparing hydrogen through hydrolysis of sodium borohydride and preparation method of load type CoB catalyst
  • Load type CoB catalyst for process of preparing hydrogen through hydrolysis of sodium borohydride and preparation method of load type CoB catalyst
  • Load type CoB catalyst for process of preparing hydrogen through hydrolysis of sodium borohydride and preparation method of load type CoB catalyst

Examples

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Effect test

Embodiment 1

[0038] [Example 1] A supported CoB catalyst for hydrogen production by hydrolysis of sodium borohydride and its preparation method (the mass percentage of Co is 3%)

[0039] Prepare a sensitizer solution with the following composition:

[0040] Silver nitrate (AgNO 3 ) concentration is 2.8×10 -4 mol / L, ammonia water (NH 3 ·H 2 O) the concentration is 5×10 -3 mol / L, the concentration of formaldehyde (HCHO) is 1.6×10 -4 mol / L. And carefully adjust the pH of the sensitizer solution to 11 with 0.2mol / L NaOH solution. Weigh 1g TiO 2 The carrier (Nanjing Tianxing New Material Co., Ltd., anatase crystal form, specific surface area of ​​81.6 square meters per gram) was added to 70 mL of the above sensitizer solution, slowly heated to 40° C., stirred for 4 hours, and then filtered. The product was washed with pure water and dried at 90°C for 4 hours to obtain the sensitized carrier. Add 1 g of the sensitized carrier to 20 mL of electroless plating solution, stir at 25 °C for 1...

Embodiment 2

[0045] [Example 2] A supported CoB catalyst for hydrogen production by hydrolysis of sodium borohydride and its preparation method (the mass percentage of Co is 1%)

[0046] In the electroless plating solution of the present embodiment, cobalt acetate (Co(Ac) 2 4H 2 (0) concentration is 0.003mol / L, and other operations are with embodiment 1. The ICP test shows that the actual loading of the active component Co in the catalyst is 0.99% by mass, and the content of silver is 0.2% by mass.

[0047] The prepared catalyst of embodiment 2 is carried out activity test, and its result is as Figure 4 As shown, the catalyst for 1wt.% NaBH at 20°C 4 (+5wt.%NaOH) aqueous solution can produce hydrogen at a rate of 4692mL / (min·g -1 Co).

Embodiment 3

[0048] [Example 3] A supported CoB catalyst for hydrogen production by hydrolysis of sodium borohydride and its preparation method (the mass percentage of Co is 15%)

[0049] In the electroless plating solution of the present embodiment, cobalt acetate (Co(Ac) 2 4H 2 (0) concentration is 0.045mol / L, and other operations are with embodiment 1. The ICP test shows that the actual loading of the active component Co in the catalyst is 7.8% by mass, and the content of silver is 0.15% by mass.

[0050] The prepared catalyst of embodiment 2 is carried out activity test, and its result is as Figure 4 As shown, the catalyst for 1wt.% NaBH at 20°C 4 (+5wt.%NaOH) aqueous solution can produce hydrogen at a rate of 4638mL / (min·g -1 Co).

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Abstract

The invention discloses a load type CoB catalyst for process of preparing hydrogen through hydrolysis of sodium borohydride. The load type CoB catalyst is a CoB / Ag-TiO2 catalyst prepared by steps of sensitizing a TiO2 carrier by using a sensitizing agent solution and carrying out chemical plating by using a chemical plating solution, wherein the mass percent of the load quantity of Co is 1-15 percent, and the mass percent of silver is 0.2 percent. The prepared CoB / Ag-TiO2 catalyst and an Mo and W modified CoB / Ag-TiO2 catalyst have high catalysis activity for a reaction for producing hydrogen through hydrolysis of sodium borohydride, show excellent reuse capacity, are very high in stability in air, and are very suitable for the demand of actual hydrogen production.

Description

technical field [0001] The invention relates to a supported CoB catalyst for hydrogen production by hydrolysis of sodium borohydride and a preparation method thereof, in particular to a method for preparing a high-performance supported CoB catalyst by an electroless plating method and a transition element modification method. Background technique [0002] With the rapid development of society, human's demand for energy is increasing day by day. In order to overcome the problems of energy shortage and environmental pollution in the future, finding renewable green energy is an important issue that needs to be solved urgently in the world. At present, hydrogen energy is considered to be one of the most ideal clean energy sources in the future energy structure. Hydrogen has a high energy density, and its combustion product is water, which is a kind of green energy. The source of hydrogen is also extremely wide, not only can be produced through natural gas reforming, biomass cra...

Claims

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Application Information

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IPC IPC(8): B01J23/89C01B3/06
CPCY02E60/36
Inventor 赵斌沈晓晨戴敏高鸣丁维平
Owner NANJING UNIV
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