Copper nanocatalyst, method for preparing the same, and application of the same in the synthesis of acetate or ammonia

Patent metadata

Field	Value
Publication number	US-2020385878-A1
Application number	US-202016892295-A
Country	US
Kind code	A1
Filing date	Jun 4, 2020
Priority date	Apr 8, 2019
Publication date	Dec 10, 2020
Grant date	—

Abstract

A copper nanocatalyst, a method for preparing the copper nanocatalyst, and an application of the copper nanocatalyst in the synthesis of acetate or ammonia are provided. The copper nanocatalyst includes a substrate and an active agent loaded on the substrate. The method includes: preparing a cleaning agent by using an ethanol and a deionized; immersing the active agent in the cleaning agent, ultrasonically cleaning for 5-10 min at a frequency of 4×104 Hz-8×104 Hz, and drying for later use; mixing the cleaned active agent and a conductive binder according to a mass ratio of 1:19-9:1 of the active agent to the conductive binder, adding the ethanol, and fully stirring and dispersing to obtain a slurry; coating the slurry on a surface of the carbon paper, and drying the carbon paper by blowing through nitrogen flow to obtain the catalyst.

First claim

1 . A copper nanocatalyst, comprising a substrate and an active agent loaded on the substrate, wherein a loading amount of the active agent on the substrate is 0.1-3.0 mg/cm 2 , and the active agent is a copper nanomaterial with an exposed 50%-99% (111) crystal face.

2 . The copper nanocatalyst according to claim 1 , wherein, the substrate comprises a carbon paper, a carbon cloth, a silicon oxide film, or an aluminum oxide film.

3 . The copper nanocatalyst according to claim 1 , wherein, the active agent is a copper nanosheet, a copper nanopolyhedron or a copper nanowire, and the copper nanosheet, the copper nanopolyhedron or the copper nanowire has the exposed 50%-99% (111) crystal face.

4 . The copper nanocatalyst according to claim 3 , wherein, the copper nanopolyhedron is at least one selected the group consisting of a copper regular nanotetrahedron, a copper nanocube, a copper regular nanooctahedron and a copper regular nanoicosahedron.

5 . The copper nanocatalyst according to claim 1 , wherein, the loading amount of the active agent on the substrate is 1.0 mg/cm 2 .

6 . A method for preparing the copper nanocatalyst according to claim 1 , comprising the following steps:
(1) preparing a cleaning agent by using an ethanol and a deionized water, wherein a volume ratio of the ethanol to the deionized water in the cleaning agent is 5-90:10-95; immersing the active agent in the cleaning agent, ultrasonically cleaning the active agent for 5-10 min at a frequency of 4×10 4 Hz-8×10 4 Hz to obtain a cleaned active agent, and drying the cleaned active agent for later use; (2) mixing the cleaned active agent and a conductive binder according to a mass ratio of 1:19-9:1 of the cleaned active agent to the conductive binder to obtain a mixture, adding the ethanol to the mixture to obtain a first solution, and fully stirring and dispersing the first solution to obtain a slurry; and (3) coating the slurry on a surface of the substrate and drying the substrate by blowing through nitrogen flow to obtain the copper nanocatalyst.

7 . The method according to claim 6 , wherein, a method for preparing the active agent comprises the following steps: dissolving and stirring copper nitrate, ascorbic acid, hexamethylenetetramine and hexadecyltrimethylammonium bromide in the deionized water to form a homogeneous solution, placing the homogeneous solution in an oil bath at 70-100° C. to react for 1-5 h to obtain a second solution, cooling the second solution, washing the second solution with a mixed solution of the ethanol and water to obtain a third solution, centrifuging the third solution to obtain a precipitate, and drying the precipitate to obtain the active agent.

8 . The method according to claim 7 , wherein, a molar ratio of the copper nitrate, the ascorbic acid, the hexamethylenetetramine and the hexadecyltrimethylammonium bromide is 1:0.1-0.5:0.1-0.5:0.5-1.

9 . The method according to claim 7 , wherein, the conductive binder is Nafion, and a mass ratio of the Nafion to the active agent is 4:1.

10 . A method of synthesizing acetate or ammonia, comprising: using the copper nanocatalyst according to claim 1 .

11 . The method according to claim 6 , wherein, the substrate comprises a carbon paper, a carbon cloth, a silicon oxide film, or an aluminum oxide film.

12 . The method according to claim 6 , wherein, the active agent is a copper nanosheet, a copper nanopolyhedron or a copper nanowire, and the copper nanosheet, the copper nanopolyhedron or the copper nanowire has the exposed 50%-99% (111) crystal face.

13 . The method according to claim 12 , wherein, the copper nanopolyhedron is at least one selected the group consisting of a copper regular nanotetrahedron, a copper nanocube, a copper regular nanooctahedron and a copper regular nanoicosahedron.

14 . The method according to claim 6 , wherein, the loading amount of the active agent on the substrate is 1.0 mg/cm 2 .

15 . The method according to claim 10 , wherein, the substrate comprises a carbon paper, a carbon cloth, a silicon oxide film, or an aluminum oxide film.

16 . The method according to claim 10 , wherein, the active agent is a copper nanosheet, a copper nanopolyhedron or a copper nanowire, and the copper nanosheet, the copper nanopolyhedron or the copper nanowire has the exposed 50%-99% (111) crystal face.

17 . The method according to claim 16 , wherein, the copper nanopolyhedron is at least one selected the group consisting of a copper regular nanotetrahedron, a copper nanocube, a copper regular nanooctahedron and a copper regular nanoicosahedron.

18 . The method according to claim 10 , wherein, the loading amount of the active agent on the substrate is 1.0 mg/cm 2 .

Assignees

• Univ Electronic Sci & Tech China

Inventors

• Kang Yijin
• Fu Xianbiao

Classifications

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title

• B01J23/72 Primary

  Copper · CPC title

• C25B11/052

  Electrodes comprising one or more electrocatalytic coatings on a substrate · CPC title

• C25B11/067

  Inorganic compound e.g. ITO, silica or titania · CPC title

• C25B11/081 Primary

  the element being a noble metal · CPC title