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Carbon-coated nickel oxide nanocomposite, preparation method and application thereof

A nano-composite material, nickel oxide technology, applied in the field of catalysis, can solve the problems of restricting the large-scale application of precious metal catalysts, high price, increasing industrial costs, etc., and achieves good industrial application prospects, excellent activity, and the effect of reducing air pollution.

Active Publication Date: 2022-07-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Noble metal catalysts (such as Rh and Ru) have high low-temperature catalytic activity for N2O catalytic decomposition (250℃~350℃ range, can efficiently decompose N2O) , but the high price limits the large-scale application of noble metal catalysts
The price of molecular sieve catalysts and transition metal oxide catalysts is significantly lower than that of noble metals, but these two types of catalysts are currently 2 The activity of catalytic decomposition of O is low, and the temperature range for efficient decomposition is 450°C to 550°C, and the high concentration of laughing gas needs to be diluted to a concentration of about 0.5% to 2% for decomposition, which greatly increases the industrial cost

Method used

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  • Carbon-coated nickel oxide nanocomposite, preparation method and application thereof
  • Carbon-coated nickel oxide nanocomposite, preparation method and application thereof
  • Carbon-coated nickel oxide nanocomposite, preparation method and application thereof

Examples

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preparation example Construction

[0048] A second aspect of the present invention also provides a method for preparing the aforementioned carbon-coated nickel oxide nanocomposite, comprising the following steps:

[0049] The nickel-containing compound and the polyvalent organic carboxylic acid are placed in a solvent and mixed to form a homogeneous solution;

[0050] removing the solvent in the homogeneous solution to obtain the precursor;

[0051] The precursor is pyrolyzed in an inert atmosphere or a reducing atmosphere;

[0052] The pyrolyzed product is subjected to oxygen treatment to obtain a nanocomposite material.

[0053] Specifically, the precursor is a water-soluble mixture, which refers to a nickel-containing water-soluble mixture obtained by dissolving a nickel-containing compound and a polyvalent organic carboxylic acid in a solvent such as water and ethanol into a homogeneous solution, and then directly evaporating and removing the solvent. Sexual mixture. The aforementioned temperature and pr...

Embodiment 1

[0074] This example is used to illustrate the preparation of the carbon-coated nickel oxide nanocomposite material of the present invention.

[0075] (1) Weigh 10 g of nickel carbonate and 10 g of citric acid into a beaker containing 100 mL of deionized water, stir at 70° C. to obtain a homogeneous solution, and continue to heat and evaporate to dryness to obtain a solid precursor.

[0076] (2) placing the solid precursor obtained in step (1) in a porcelain boat, then placing the porcelain boat in the constant temperature zone of the tube furnace, feeding nitrogen with a flow rate of 100 mL / min, and heating at a rate of 4 °C / min The temperature was raised to 600° C., the heating was stopped after 2 hours of constant temperature, and the mixture was cooled to room temperature under a nitrogen atmosphere to obtain a black solid.

[0077] (3) the black solid obtained in step (2) is placed in the porcelain boat, then the porcelain boat is placed in the constant temperature zone of...

Embodiment 2

[0082] This example is used to illustrate the preparation of the carbon-coated nickel oxide nanocomposite material of the present invention.

[0083] (1) Weigh 10 g of nickel acetate and 10 g of citric acid into a beaker containing 100 mL of deionized water, stir at 70° C. to obtain a homogeneous solution, and continue to heat and evaporate to dryness to obtain a solid precursor.

[0084] (2) placing the solid precursor obtained in step (1) in a porcelain boat, then placing the porcelain boat in the constant temperature zone of the tube furnace, feeding nitrogen with a flow rate of 100 mL / min, and heating at a rate of 2 °C / min The temperature was raised to 650° C., the heating was stopped after 2 h, and the mixture was cooled to room temperature under a nitrogen atmosphere to obtain a black solid.

[0085] (3) the black solid obtained in step (2) is placed in the porcelain boat, then the porcelain boat is placed in the constant temperature zone of the tube furnace, and the flo...

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Abstract

The invention provides a carbon-coated nickel oxide nanocomposite material and a preparation method and application thereof. The nanocomposite material contains a nuclear membrane structure with an outer membrane and an inner core, the outer membrane is a graphitized carbon membrane, and the inner core contains nickel oxide nanoparticles , wherein the carbon content accounts for no more than 5wt% of the nanocomposite material. The nanocomposite has excellent activity as a catalyst, which can effectively catalyze the decomposition of nitrous oxide, which is helpful to solve the high concentration of N produced in the production process of adipic acid plants and nitric acid plants. 2 The elimination of O is of great significance for protecting the environment and reducing air pollution, and has a good industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a carbon-coated nickel oxide nanocomposite material and a preparation method and application thereof. Background technique [0002] Transition metal oxides have excellent catalytic properties and opto-electromagnetic properties. They are a research hotspot in the field of inorganic materials and have wide applications in energy storage materials, catalytic materials, magnetic recording materials, and biomedicine. Carbon materials have good electrical conductivity, good chemical / electrochemical stability, and high structural strength. Coating the nano-particles of active metals or metal oxides with carbon materials can effectively improve the conductivity and stability of the nano-materials, and have a limited domain effect on the nano-particles, so that they are not easy to agglomerate. In recent years, carbon-coated nanomaterials have been widely used in electrocatalysis, sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01D53/86B01D53/56
CPCB01J23/755B01D53/8628B01D2255/20753B01D2255/702B01D2257/402Y02P20/30Y02C20/10
Inventor 荣峻峰于鹏徐国标吴耿煌谢婧新宗明生林伟国纪洪波
Owner CHINA PETROLEUM & CHEM CORP
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