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Preparing method for nitrogen-doped porous carbon material, catalyst comprising material and application of material

A technology of nitrogen-doped porous carbon and supported catalysts, which is applied in the direction of catalyst carriers, preparation of organic compounds, physical/chemical process catalysts, etc., can solve the problems of high cost and cumbersome synthesis steps of nitrogen-containing ionic liquids, and achieve uniform distribution , enhanced catalytic activity and service life, and controllable doping content

Active Publication Date: 2015-06-10
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

However, in the method disclosed in the literature (Nature Commun., 2013, 4, 1593), ionic liquids are used as a nitrogen source to achieve nitrogen doping. The synthesis steps of nitrogen-containing ionic liquids are not only cumbersome, but also very expensive, making this method difficult to practice. application
[0005] In summary, carbon materials as catalyst supports have certain catalytic activity for alcohol condensation reactions, but so far, there are no related reports on the application of in-situ nitrogen-doped carbon material catalysts in aqueous phase alcohol condensation reactions.

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  • Preparing method for nitrogen-doped porous carbon material, catalyst comprising material and application of material
  • Preparing method for nitrogen-doped porous carbon material, catalyst comprising material and application of material
  • Preparing method for nitrogen-doped porous carbon material, catalyst comprising material and application of material

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preparation example Construction

[0036] The preparation method of the metal-loaded catalyst of the present invention is not particularly limited, conventional deposition methods and reduction methods in the prior art can be used, for example, the prepared nitrogen-doped porous carbon material is mixed with a salt solution of a noble metal as a catalyst carrier, and the method, deposition-precipitation method, sol-gel method, and photodeposition method to load the metal on the surface of the carrier, and then use hydrogen reduction, sodium borohydride reduction, hydrazine hydrate reduction, sodium formate reduction, formaldehyde reduction, sodium citrate Any one of the reduction, ascorbic acid reduction, ethylene glycol reduction, ethanol reduction and methanol reduction methods can be used to reduce the metal atoms, and finally a nitrogen-doped porous carbon-supported noble metal catalyst can be obtained.

[0037] The specific surface area of ​​the final nitrogen-doped porous carbon material obtained according...

preparation Embodiment 1

[0045] Preparation Example 1: Preparation of nitrogen-doped porous carbon material

[0046] Dissolve 0.5g of dicyandiamide, 9g of glucose and 0.75g of sodium tetraborate in 20mL of deionized water, transfer it to the reaction kettle after mixing evenly, keep it at 180°C for 24 hours, after cooling, filter, wash, and dry to obtain Reddish-brown solid. Afterwards, the obtained reddish-brown solid was calcined in a tube furnace in an argon gas atmosphere, and kept at 550° C. for 24 hours. After the tube furnace dropped to room temperature, the sample was taken out and ground to obtain a nitrogen-doped porous carbon material.

[0047] figure 1 (b) and figure 2 (b) are the SEM and TEM photos of the nitrogen-doped porous carbon material prepared according to this preparation example. It can be seen from the photos that when an appropriate amount of nitrogen-containing substance is added, a clear porous network structure can be seen.

[0048] XPS elemental analysis results ( i...

preparation Embodiment 2

[0051] The amount of dicyandiamide was changed to 0.1 g, and the nitrogen-doped carbon material was prepared according to the same method as in Example 1. The elemental analysis results show that the nitrogen content of the material is 2.8at%, and the BET test results show that the specific surface area is about 580m 2 / g, the material is a micro-mesoporous structure, but compared with the material obtained in Preparation Example 1, the particles are smaller, and the result is obtained by Figure 5 shown in the TEM photographs.

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Abstract

The invention relates to a novel preparing method for an in-situ nitrogen-doped porous carbon material, the application of the in-situ nitrogen-doped porous carbon material serving as a carrier of a load type catalyst, the load type catalyst comprising the in-situ nitrogen-doped porous carbon material, and the application of the load type catalyst in the water phase alcohol condensation reaction. Cheap micromolecule nitrogen substances serve as a nitrogen source of the in-situ nitrogen-doped porous carbon material, nitrogen atom in-situ doping is achieved in the carbon material preparing process, the doping content of the in-situ nitrogen-doped porous carbon material is controllable, the in-situ nitrogen-doped porous carbon material is distributed evenly, the dispersity of metal in the carrier and the combining strength with the carrier can be improved through doping of nitrogen atoms, and therefore the catalytic activity of the nitrogen-doped porous carbon material can be improved, and the service life of the nitrogen-doped porous carbon material can be prolonged.

Description

technical field [0001] The invention belongs to the field of inorganic nanomaterials, and relates to a preparation method of a novel in-situ nitrogen-doped porous carbon material and its use as a carrier for a supported catalyst, as well as a supported catalyst comprising the in-situ nitrogen-doped porous carbon material and The application of the supported catalyst in water phase alcohol condensation reaction. Background technique [0002] Bioalcohol can be used as a sustainable biofuel and also an important chemical raw material. At present, more and more biomass alcohols are obtained through the fermentation of renewable biomass raw materials, but most of the obtained bioalcohols are dissolved in solvents, and the separation and purification in the later stage has become a major problem in current technology. Polar biomass alcohols such as ethanol and butanol are difficult to separate from water, making distillation and dehydration costs account for more than half of pro...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J23/52B01J23/44B01J23/42B01J23/46C07C29/34C07C31/12C07C31/125
Inventor 牟新东陈秀芳柳蒂徐国强董波姜义军
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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