Carbon-coated nickel oxide nanocomposite material, preparation method therefor and use thereof

Patent metadata

Field	Value
Publication number	US-12528077-B2
Application number	US-202017755070-A
Country	US
Kind code	B2
Filing date	Oct 20, 2020
Priority date	Oct 21, 2019
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

A carbon-coated nickel oxide nanocomposite material, its preparation, and application thereof are provided. The nanocomposite material contains carbon-coated nickel oxide nanoparticles having a core-shell structure including an outer shell that is a graphitized carbon film optionally doped with nitrogen and an inner core comprising nickel oxide nanoparticle(s). The nanocomposite material has a carbon content of from greater than 0 wt % to not greater than about 5 wt %, based on the weight of the nanocomposite material.

First claim

The invention claimed is:

1 . A carbon-coated nickel oxide nanocomposite material, comprising carbon-coated nickel oxide nanoparticles having a core-shell structure, with an outer shell being a graphitized carbon film optionally doped with nitrogen and an inner core comprising one or more nickel oxide nanoparticles,
wherein the nanocomposite material has a carbon content of from greater than 0 wt % to not greater than about 5 wt %, based on the weight of the nanocomposite material, and wherein a surface of the nanocomposite material has a carbon element content of about 15-60 mol %, as determined by X-ray photoelectron spectroscopy; and/or a ratio of the carbon element mass content in a surface of the nanocomposite material determined by X-ray photoelectron spectroscopy to the carbon element mass content determined by elemental analysis of not less than about 10.

2 . The nanocomposite material according to claim 1 , wherein the nanocomposite material has a Raman spectrum in which a ratio of the intensity of the G peak near 1580 cm −1 to the intensity of the D peak near 1320 cm −1 is greater than about 2.

3 . The nanocomposite material according to claim 1 , wherein the outer shell of the core-shell structure is a nitrogen-doped graphitized carbon film and the nanocomposite material has a nitrogen element content of about 0.1-5 mol %, as determined by X-ray photoelectron spectroscopy.

4 . The nanocomposite material according to claim 1 , wherein the carbon-coated nickel oxide nanoparticles have a particle size of about 1-100 nm.

5 . A method for preparing the carbon-coated nickel oxide nanocomposite material according to claim 1 , comprising the steps of:
i) mixing a nickel source, a polybasic organic carboxylic acid and optionally a nitrogen-containing compound in a solvent to form a homogeneous solution; ii) removing the solvent from the homogeneous solution to obtain a precursor; iii) pyrolyzing the precursor under an inert or reducing atmosphere; and iv) heat treating the pyrolyzed product in the presence of oxygen to obtain the nanocomposite material, wherein the nickel source is one or more selected from the group consisting of nickel powder, nickel hydroxide, nickel oxide, soluble organic acid salts of nickel, basic carbonates of nickel, and carbonates of nickel; the polybasic organic carboxylic acid is one or more selected from the group consisting of citric acid, maleic acid, trimesic acid, terephthalic acid, gluconic acid, malic acid, ethylenediaminetetraacetic acid, dipicolinic acid, iminodiacetic acid, diethylenetriaminepentaacetic acid, and 1,3-propanediaminetetraacetic acid; and the nitrogen-containing compound is one or more selected from the group consisting of urea, melamine, dicyanodiamine, hexamethylenetetramine, and amino acids.

6 . The method according to claim 5 , wherein the heat treatment of step iv) comprises contacting an oxygen-containing gas with the pyrolyzed product at about 200-500° C. for about 0.5-10 h, wherein the oxygen-containing gas has an oxygen concentration by volume of about 10-40%.

7 . The method according to claim 5 , wherein, in step i), the nickel source is mixed with that polybasic organic carboxylic acid that is one or more selected from the group consisting of citric acid, maleic acid, trimesic acid, terephthalic acid, gluconic acid, and malic acid in the solvent, and the mass ratio of the nickel source to the polybasic organic carboxylic acid is about 1:(0.1-100).

8 . The method according to claim 5 , wherein, in step i), the nickel source is mixed with the polybasic organic carboxylic acid that is one or more selected from the group consisting of ethylenediaminetetraacetic acid, dipicolinic acid, iminodiacetic acid, acid, and diethylenetriaminepentaacetic 1,3-propylenediaminetetraacetic acid in the solvent, and the mass ratio of the nickel source to the polybasic organic carboxylic acid is about 1:(0.1-10).

9 . The method according to claim 5 , wherein, in step i), the nickel source, the polybasic organic carboxylic acid that is one or more selected from the group consisting of citric acid, maleic acid, trimesic acid, terephthalic acid, gluconic acid and malic acid and the nitrogen-containing compound are mixed in the solvent, and the mass ratio of the nickel source, the polybasic organic carboxylic acid and the nitrogen-containing compound is about 1:(0.1-10):(0.1-10).

10 . The method according to claim 5 , wherein the pyrolysis of step iii) comprises: heating the precursor in the inert or reducing atmosphere to a temperature of a constant-temperature stage, and maintaining the temperature for a period of time;
wherein the rate of heating is about 0.5-30° C./min, the temperature of the constant-temperature stage is about 400-800° C., the period of time is about 20-600 min, the inert atmosphere is nitrogen or argon, and the reducing atmosphere is a mixed gas of an inert gas and hydrogen.

11 . A method for catalyzing the decomposition of nitrous oxide, comprising contacting nitrous oxide with a catalyst for catalytic decomposition to produce nitrogen and oxygen, wherein the catalyst comprises the nanocomposite material according to claim 1 .

12 . The method according to claim 11 , wherein the catalytic decomposition is carried out at a reaction temperature of about 300-400° C., a reaction space velocity of about 1000-3000 ml of reaction gas/(hr·g of catalyst), and a volume concentration of nitrous oxide in the reaction gas of about 5-40%.

13 . A method for treating volatile organic compounds, comprising contacting a volatile organic compound with a catalyst for oxidation reaction, wherein the catalyst comprises the nanocomposite material according to claim 1 .

14 . The method according to claim 13 , wherein the oxidation reaction is carried out by bringing a mixed gas containing the volatile organic compound and oxygen into contact with the catalyst, and the mixed gas comprises about 0.01-2% by volume of the volatile organic compound, and about 5-20% by volume of oxygen, and the volatile organic compound is one or more selected from the group consisting of C 1 -C 4 hydrocarbon compounds.

15 . The method according to claim 13 , wherein the oxidation reaction is carried out at a reaction temperature of about 300-450° C. and a reaction space velocity of about 1000-5000 ml of reaction gas/(hr·g of catalyst).

16 . The nanocomposite material according to claim 1 , wherein the nanocomposite material has a carbon content of about 0.4-0.95 wt %, based on the weight of the nanocomposite material, a ratio of the carbon element mass content the nanocomposite material determined by X-ray photoelectron spectroscopy to the carbon element mass content determined by elemental analysis of about 20-40, and a ratio of the intensity of the G peak near 1580 cm −1 to the intensity of the D peak near 1320 cm −1 is greater than about 2 and not greater than about 3.

Assignees

• China Petroleum & Chem Corp
• Sinopec Res Inst Petroleum

Inventors

• Rong Junfeng
• Yu Peng
• Xie Jingxin
• Xu Guobiao
• Zong Mingsheng
• Wu Genghuang
• Lin Weiguo
• Ji Hongbo

Classifications

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J35/398

  Egg yolk like · CPC title

• B01J2523/847

  Nickel · CPC title