Noble metal-transition metal-based nano-catalyst thin film and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2023285953-A1
Application number	US-202218147140-A
Country	US
Kind code	A1
Filing date	Dec 28, 2022
Priority date	Dec 31, 2021
Publication date	Sep 14, 2023
Grant date	—

Abstract

The present disclosure provides a noble metal-transition metal-based nano-catalyst thin film and a preparation method thereof, belonging to the fields of energy development and pollutant emission reduction. Based on a micro-nano processing technology, a noble metal-transition metal-based nano-catalyst thin film is loaded on a semi-cylindrical pipe with an inner thread structure, and heat generated is quickly accumulated on an upper surface of the catalyst to establish a large temperature gradient. By the insulation and high roughness of an alumina carrier layer and the inner thread structure of the pipe, a catalyst loading area is maximized and dispersion of noble metal atoms is enhanced. A transition metal-transition metal oxide thin film protects a noble metal nano-catalyst by core-shell wrapping, and a transition metal oxide prevents catalyst deactivation caused by oxygen occupying too many metal active sites.

First claim

What is claimed is:

1 - 10 . (canceled)

11 .A preparation method of a noble metal-transition metal-based nano-catalyst thin film, comprising the following steps:
providing a semi-cylindrical pipe with an inner thread structure; conducting a surface pretreatment on the semi-cylindrical pipe to obtain a pretreated substrate; and conducting magnetron sputtering on a surface of the pretreated substrate to sequentially obtain an alumina carrier layer, a noble metal-based elementary substance layer, and a transition metal-transition metal oxide layer, thereby obtaining the noble metal-transition metal-based nano-catalyst thin film.

12 . The preparation method according to claim 11 , wherein the semi-cylindrical pipe is prepared from silicon carbide.

13 . The preparation method according to claim 11 , wherein the semi-cylindrical pipe has a length of 20 mm, an inner diameter of 20 mm, a number of threads of 30, a wall thickness of 1 mm, a thread rib width of 0.7 mm, a thread rib height of 0.7 mm, a helix angle of 30°, and a thread pitch of 2 mm.

14 . The preparation method according to claim 12 , wherein the semi-cylindrical pipe has a length of 20 mm, an inner diameter of 20 mm, a number of threads of 30, a wall thickness of 1 mm, a thread rib width of 0.7 mm, a thread rib height of 0.7 mm, a helix angle of 30°, and a thread pitch of 2 mm.

15 . The preparation method according to claim 11 , wherein the surface pretreatment is to conduct ultrasonic washing with acetone, ultrasonic washing with water, water rinsing, blow-drying, soaking in an oxalic acid solution, and drying in sequence.

16 . The preparation method according to claim 11 , wherein the magnetron sputtering is conducted at a background vacuum degree of less than 2×10 -6 Torr.

17 . The preparation method according to claim 11 , further comprising splicing two of the semi-cylindrical pipes after magnetron sputtering into a cylindrical pipe after the transition metal-transition metal oxide layer is obtained.

18 . The preparation method according to claim 11 , wherein the noble metal is selected from the group consisting of palladium and platinum; and the transition metal is selected from the group consisting of cobalt, titanium, copper, iron, and nickel.

19 . A noble metal-transition metal-based nano-catalyst thin film prepared by the preparation method according to claim 1 , comprising the semi-cylindrical pipe, the alumina carrier layer, the noble metal-based elementary substance layer, and the transition metal-transition metal oxide layer.

20 . The noble metal-transition metal-based nano-catalyst thin film according to claim 19 , wherein the semi-cylindrical pipe is prepared from silicon carbide.

21 . The noble metal-transition metal-based nano-catalyst thin film according to claim 19 , wherein the semi-cylindrical pipe has a length of 20 mm, an inner diameter of 20 mm, a number of threads of 30, a wall thickness of 1 mm, a thread rib width of 0.7 mm, a thread rib height of 0.7 mm, a helix angle of 30°, and a thread pitch of 2 mm.

22 . The noble metal-transition metal-based nano-catalyst thin film according to claim 20 , wherein the semi-cylindrical pipe has a length of 20 mm, an inner diameter of 20 mm, a number of threads of 30, a wall thickness of 1 mm, a thread rib width of 0.7 mm, a thread rib height of 0.7 mm, a helix angle of 30°, and a thread pitch of 2 mm.

23 . The noble metal-transition metal-based nano-catalyst thin film according to claim 19 , wherein the surface pretreatment is to conduct ultrasonic washing with acetone, ultrasonic washing with water, water rinsing, blow-drying, soaking in an oxalic acid solution, and drying in sequence.

24 . The noble metal-transition metal-based nano-catalyst thin film according to claim 19 , wherein the magnetron sputtering is conducted at a background vacuum degree of less than 2×10 -6 Torr.

25 . The noble metal-transition metal-based nano-catalyst thin film according to claim 19 , further comprising splicing two of the semi-cylindrical pipes after magnetron sputtering into a cylindrical pipe after the transition metal-transition metal oxide layer is obtained.

26 . The noble metal-transition metal-based nano-catalyst thin film according to claim 19 , wherein the noble metal is selected from the group consisting of palladium and platinum; and the transition metal is selected from the group consisting of cobalt, titanium, copper, iron, and nickel.

27 . The noble metal-transition metal-based nano-catalyst thin film according to claim 19 , wherein the alumina carrier layer has a thickness of 20 µm, and the noble metal-based elementary substance layer and the transition metal-transition metal oxide layer have a total thickness of less than or equal to 100 µm.

28 . The noble metal-transition metal-based nano-catalyst thin film according to claim 20 , wherein the alumina carrier layer has a thickness of 20 µm, and the noble metal-based elementary substance layer and the transition metal-transition metal oxide layer have a total thickness of less than or equal to 100 µm.

29 . The noble metal-transition metal-based nano-catalyst thin film according to claim 21 , wherein the alumina carrier layer has a thickness of 20 µm, and the noble metal-based elementary substance layer and the transition metal-transition metal oxide layer have a total thickness of less than or equal to 100 µm.

30 . The noble metal-transition metal-based nano-catalyst thin film according to claim 22 , wherein the alumina carrier layer has a thickness of 20 µm, and the noble metal-based elementary substance layer and the transition metal-transition metal oxide layer have a total thickness of less than or equal to 100 µm.

Assignees

• Univ Chongqing
• Univ China Mining

Inventors

• Nie Baisheng
• Kong Fanbei
• Liu Xianfeng
• Li Xiangchun
• Meng Junqing
• Zhu Tao

Classifications

• B01J35/45

  Nanoparticles · CPC title

• C23C14/081

  of aluminium, magnesium or beryllium · CPC title

• C23C14/021

  Cleaning or etching treatments · CPC title

• C23C14/14

  Metallic material, boron or silicon · CPC title

• C23C14/08

  Oxides (C23C14/10 takes precedence) · CPC title