Co-B/NGO composite nanometer material as well as preparation method and application thereof

A composite nanomaterial, co-b technology, applied in the field of catalytic chemistry, can solve the problems of catalyst material microstructure damage, reduce catalyst catalytic performance, low commercial application value, etc., achieve excellent catalytic performance, excellent cycle performance, and protect the microscopic shape. appearance effect

Inactive Publication Date: 2019-03-22
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reasons why the cycle performance cannot meet the requirements are: because the recovery method of suction filtration or centrifugation will cause irreversible damage to the microstructure of the catalyst material, thereby greatly reducing the catalytic performance of the catalyst after recycling
[0005] Noble metal catalysts have high catalytic efficiency, but the cost is too high and the commercial application value is not high
Non-precious metal catalysts are cheap, but the catalytic effect is poor

Method used

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  • Co-B/NGO composite nanometer material as well as preparation method and application thereof
  • Co-B/NGO composite nanometer material as well as preparation method and application thereof
  • Co-B/NGO composite nanometer material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation method of Co-B / NGO composite nanomaterial, concrete operation steps are as follows:

[0033] Step 1) Precursor preparation, weigh 1mmol of nitrogen-doped graphene and 6mmol of cobalt nitrate hexahydrate, add to deionized water for ultrasonic dispersion, then add sodium borohydride at a ratio of 1:10 for in-situ reduction, and then The solution obtained above is centrifuged, and the precursor is obtained after washing;

[0034] Step 2) Preparation of Co-B / NGO composite nanomaterials. Put the precursor in a refrigerator, freeze for 24 hours, and freeze-dry at -48°C to obtain Co-B / NGO composite nanomaterials.

[0035] Co-B / NGO composite nanomaterial is carried out the test of scanning electron microscope among the embodiment 1, and the result is as follows figure 1 As shown, the microstructure of Co-B / NGO composite nanomaterials is a lamellar structure.

[0036] The Co-B / NGO composite nanomaterial in Example 1 was tested for isothermal adsorption performanc...

Embodiment 2

[0042] The preparation method of Co-B / NGO nano-composite material, the concrete operation steps not specified in particular are identical with above-mentioned embodiment 1, and difference is: described step 1) ratio of the amount of substance of nitrogen-doped graphene and inorganic cobalt salt For 2: (1-6).

[0043] The characterization test methods are the same as those in Example 1 above.

[0044] The Co-B / NGO composite nanomaterial in Example 2 was tested by a scanning electron microscope, and the microstructure of the Co-B / NGO composite nanomaterial is a lamellar structure.

[0045] The Co-B / NGO composite nanomaterial in Example 2 was subjected to a low-temperature nitrogen isothermal adsorption performance test, and the Co-B / NGO composite nanomaterial specific surface area was 62m 2 g -1 .

[0046] The Co-B / NGO composite nanomaterial in Example 2 was subjected to a low-temperature nitrogen isothermal adsorption performance test, and the Co-B / NGO composite nanomaterial...

Embodiment 3

[0050] The preparation method of Co-B / NGO nano-composite material, the concrete operation steps not specified in particular are identical with above-mentioned embodiment 1, and difference is: described step 1) ratio of the amount of substance of nitrogen-doped graphene and inorganic cobalt salt For 3: (1-6).

[0051] The characterization test methods are the same as those in Example 1 above.

[0052] The Co-B / NGO composite nanomaterial in Example 3 was tested by a scanning electron microscope, and the microstructure of the Co-B / NGO composite nanomaterial is a lamellar structure.

[0053] The Co-B / NGO composite nanomaterial in Example 3 was subjected to a low-temperature nitrogen isothermal adsorption performance test, and the Co-B / NGO composite nanomaterial specific surface area was 59m 2 g -1 .

[0054] The Co-B / NGO composite nanomaterial in Example 3 was subjected to a low-temperature nitrogen isothermal adsorption performance test, and the Co-B / NGO composite nanomaterial...

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Abstract

The invention discloses a Co-B/NGO composite nanometer material. The Co-B/NGO composite nanometer material is prepared by firstly performing in-site reduction on nitrogen-doped graphene and inorganiccobalt salt through sodium borohydride and then performing freezing-drying, the specific area is 40-100 m<2>g<-1>; the material is magnetic, and can be attracted by a magnet. When the composite nanometer material is used as a catalyst for hydroboron hydrogen generation by hydrolysis, the hydrogen desorption rate is 500-1700mL/min<-1>g<-1>, and the hydrogen production rate is 100%; the material canbe adsorbed and recycled by the magnet, the recycling rate reaches 99.5%, and the hydrogen production rate after being circulated is maintained at 100-1530mL min<-1>g<-1>, namely, maintaining 50-85%of the initial hydrogen production rate. The preparation method comprises the following steps: 1) precursor preparation: adding nitrogen-doped graphene and inorganic cobalt salt in an aqueous solutionfor ultrasonic dispersion mixing, reducing by using sodium borohydride, and finally centrifuging and washing to obtain a precursor; 2) preparation of the Co-B/NGO composite nanometer material: freeze-drying the precursor to obtain the Co-B/NGO composite nanometer material. The Co-B/NGO composite nanometer material disclosed by the invention is simple in preparation, has more excellent catalysis performance, and has an extensive application prospect in the application field of the hydroboron hydrogen generation by hydrolysis.

Description

technical field [0001] The invention relates to the technical field of catalytic chemistry, in particular to a Co-B / NGO composite nanomaterial and its preparation method and application. Background technique [0002] Energy is the most important material for human survival and the most important resource for human development. The use of energy by humans has played a vital role in the history of human evolution and development. Drilling wood for fire has brought about the development of primitive civilization, the use of coal has brought about the development of iron and steel smelting, and the use of energy such as oil and natural gas It also brought the development of modern industry. With the rapid development of modern industry, the consumption of energy is increasing, and at the same time, the problems of environmental pollution and energy depletion are becoming more and more serious. Hydrogen energy, as an efficient and clean secondary energy source, has attracted wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J37/16B01J35/10B82Y30/00B82Y40/00C01B3/04
CPCB82Y30/00B82Y40/00C01B3/042B01J23/75B01J35/0033B01J35/1014B01J35/1019B01J37/16C01B2203/1052C01B2203/0277Y02E60/36
Inventor 孙立贤李晶华徐芬陈沛荣陆磊磊朱宇
Owner GUILIN UNIV OF ELECTRONIC TECH
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