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CN-121992438-A - Ammonia oxidation catalyst, preparation method and application thereof

CN121992438ACN 121992438 ACN121992438 ACN 121992438ACN-121992438-A

Abstract

The application provides an ammoxidation catalyst, a preparation method and application thereof. The ammoxidation catalyst comprises a foamed nickel material and copper hydroxide supported on the foamed nickel material. The ammonia oxidation catalyst provided by the application takes copper hydroxide as an active component, the foam nickel material is taken as a conductive substrate, based on the Cu-Ni surface reconstruction effect, a Cu x Ni 1‑x OOH active center is formed by reconstructing a lower potential area under an alkaline test condition, and the NH 3 adsorption can be optimized, so that the reaction activity and the mass transfer efficiency of the ammonia oxidation catalyst are improved, and the ammonia oxidation catalyst has the advantages of high activity, high stability and the like.

Inventors

  • LIU WENJUN
  • LIANG YULAN
  • FANG MING
  • ZENG YUXIANG
  • CAO PEIJIANG
  • ZHU DELIANG
  • Han shun
  • LIU XINKE
  • WANG CHUNFENG

Assignees

  • 深圳大学

Dates

Publication Date
20260508
Application Date
20251219

Claims (10)

  1. 1. An ammoxidation catalyst, characterized in that the ammoxidation catalyst comprises a foamed nickel material and copper hydroxide supported on the foamed nickel material.
  2. 2. The ammoxidation catalyst according to claim 1, wherein the copper hydroxide has a rod-like structure having a radial dimension of 20nm to 60nm, and/or The copper hydroxide loading surface density was 0.25mg/cm 2 ~0.75mg/cm 2 based on the area of the nickel foam material.
  3. 3. A method for preparing an ammoxidation catalyst, said method comprising: Mixing copper hydroxide-containing catalyst powder with a solvent to form a catalyst ink, and And (3) dropwise adding the catalyst ink onto a foam nickel material, and heating to load the copper hydroxide on the foam nickel material, so as to obtain the ammoxidation catalyst.
  4. 4. The process according to claim 3, wherein the solvent comprises an organic solvent, an aqueous solvent and an ionomer solution, and/or In the catalyst ink, the mass volume ratio of the catalyst powder is 2 mg/mL-8 mg/mL.
  5. 5. The method according to claim 4, wherein the organic solvent comprises at least one of isopropyl alcohol, n-propyl alcohol and ethyl alcohol, and/or The aqueous solvent comprises deionized water and/or The ionomer solution includes at least one of a perfluorosulfonic acid type polymer solution and polyethylene glycol.
  6. 6. The method of preparing according to claim 3, wherein the step of forming the ammoxidation catalyst comprises: and repeatedly performing the steps of dripping the catalyst ink onto the foam nickel material and heating to load the copper hydroxide on the foam nickel material, thereby obtaining the ammoxidation catalyst.
  7. 7. The method according to claim 6, wherein the single drop of the catalyst ink is 10. Mu.L/cm 2 ~30μL/cm 2 based on the area of the nickel foam, and/or The total drop amount of the catalyst ink was 100. Mu.L/cm 2 ~300μL/cm 2 based on the area of the foamed nickel material.
  8. 8. A method of preparing the catalyst powder according to claim 3, comprising: Dissolving copper nitrate hexahydrate in water to obtain a first solution; Dripping alkali solution into the first solution and stirring to perform precipitation reaction to form precipitate, and And collecting, washing and drying the precipitate to obtain the catalyst powder.
  9. 9. The method according to claim 8, wherein in the step of adding alkali solution dropwise to the first solution and stirring to perform precipitation reaction, the stirring speed is 300rpm to 500rpm, and the stirring time is 140min to 240min.
  10. 10. Use of a catalyst in the conversion of ammonia energy, characterized in that the catalyst is an ammoxidation catalyst according to any one of claims 1 to 2 or an ammoxidation catalyst prepared by the method for preparing an ammoxidation catalyst according to any one of claims 3 to 9.

Description

Ammonia oxidation catalyst, preparation method and application thereof Technical Field The application relates to the technical field of catalysts, in particular to an ammonia oxidation catalyst and a preparation method and application thereof. Background The research is carried out by the Shenzhen university stability support planning project, namely the design, preparation and performance study of the high-efficiency nickel-based catalyst for electrochemical ammoxidation (project number: 20231120195047001). The energy conversion of ammonia is highly dependent on the efficient performance of Ammonia Oxidation (AOR), but AOR imposes extremely high demands on the activity, stability and resistance to dissolution/poisoning of AOR catalysts due to the inherent problems of multiple electron transfer (6 e - process) and slow reaction kinetics of AOR itself. At present, the research of the AOR catalyst is mainly divided into two directions of a noble metal catalyst and a non-noble metal catalyst. However, the noble metal AOR catalyst has the problems of high cost, low utilization rate of active sites and the like, while the non-noble metal AOR catalyst has the problems of insufficient exposure of active sites, poor mass transfer efficiency, high recovery difficulty and the like, and the problems limit the practical application of the AOR catalyst. Disclosure of Invention In view of this, in order to solve at least one of the above technical problems, an embodiment of the present application provides an ammonia oxidation catalyst. In addition, the embodiment of the application also provides a preparation method of the ammonia oxidation catalyst and application of the ammonia oxidation catalyst. In a first aspect, the present application provides an ammoxidation catalyst comprising a nickel foam material and copper hydroxide supported on the nickel foam material. Based on the second aspect, in some possible embodiments, the copper hydroxide is a rod-shaped structure, the radial dimension of the rod-shaped structure is 20 nm-60 nm, and/or the loading area density of the copper hydroxide is 0.25mg/cm 2~0.75mg/cm2 based on the area of the foam nickel material. In a second aspect, the embodiment of the application provides a preparation method of an ammonia oxidation catalyst, which comprises the steps of mixing catalyst powder containing copper hydroxide with a solvent to form catalyst ink, and dripping the catalyst ink onto a foam nickel material and heating to load the copper hydroxide on the foam nickel material to obtain the ammonia oxidation catalyst. Based on the second aspect, in some possible embodiments, the solvent comprises an organic solvent, an aqueous solvent and an ionomer solution, and/or the mass-to-volume ratio of the catalyst powder in the catalyst ink is 2mg/mL to 8mg/mL. Based on the second aspect, in some possible embodiments, the organic solvent comprises at least one of isopropanol, n-propanol, and ethanol, and/or the aqueous solvent comprises deionized water, and/or the ionomer solution comprises at least one of a perfluorosulfonic acid-type polymer solution, and polyethylene glycol. Based on the second aspect, in some possible embodiments, the step of forming the ammonia oxidation catalyst includes performing the step of dropping the catalyst ink onto a nickel foam material and heating a plurality of times to load the copper hydroxide on the nickel foam material to obtain the ammonia oxidation catalyst. Based on the second aspect, in some possible embodiments, the single drop of the catalyst ink is 10 μL/cm 2~30μL/cm2 based on the area of the nickel foam material, and/or the total drop of the catalyst ink is 100 μL/cm 2~300μL/cm2 based on the area of the nickel foam material. Based on the second aspect, in some possible embodiments, the preparation method of the catalyst powder comprises dissolving copper nitrate hexahydrate in water to obtain a first solution, dripping alkali liquor into the first solution and stirring for precipitation reaction to form a precipitate, and collecting, washing and drying the precipitate to obtain the catalyst powder. Based on the second aspect, in some possible embodiments, in the step of adding alkali solution dropwise to the first solution and stirring to perform precipitation reaction, the stirring speed is 300 rpm-500 rpm, and the stirring time is 140 min-240 min. In a third aspect, the embodiment of the application also provides an application of the ammonia oxidation catalyst in ammonia energy conversion. Compared with the prior art, the ammonia oxidation catalyst provided by the embodiment of the application uses copper hydroxide as an active component, the foam nickel material is used as a conductive substrate, based on the Cu-Ni surface reconstruction effect, a Cu xNi1-x OOH active center is formed by reconstruction in a lower potential area under an alkaline test condition, and the adsorption of NH 3 can be optimized, so that the reaction activity an