Device and method for preparing oxygen vacancies of catalytic materials

A catalytic material, oxygen vacancy technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as unfavorable promotion and application, uncontrollable oxygen vacancy, complicated process, etc., to shorten the time And the steps, the process is simple, and the effect of improving the degree of energy matching

Pending Publication Date: 2021-05-14
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also has the disadvantages of complex process, uncontrollable oxygen vacancies and high cost, which is not conducive to subsequent promotion and application.

Method used

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  • Device and method for preparing oxygen vacancies of catalytic materials
  • Device and method for preparing oxygen vacancies of catalytic materials
  • Device and method for preparing oxygen vacancies of catalytic materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Use the device of the present invention to carry out hydrogen reduction modification on commercial nano-cerium oxide, and compare the effect of photodegradation of Rhodamine B. The specific implementation steps are as follows:

[0044] (1) Place the nano-cerium oxide material in the second reaction chamber 2, and tighten the fifth valve 14;

[0045] (2) Unscrew the first valve 10 and the fourth valve 13 to evacuate the reaction chamber;

[0046] (3) Tighten the first valve 10, unscrew the third valve 12, fill in 0.2MPa inert gas, and clean the reaction chamber; repeat the above steps 3 to 5 times, then tighten the first valve 10 and the third valve 12 ;

[0047] (4) Select hydrogen as reducing agent, unscrew the second valve 11, feed 0.5MPa H in the reaction chamber 2 , wait for the reading of the second pressure gauge 15 to be stable, then tighten the fourth valve 13;

[0048] (5) Turn on the second heating device 4, the heating rate is 5°C / min, the reaction tempera...

Embodiment 2

[0053] Using the device of the present invention to simultaneously reduce the nanometer monoclinic green tungsten oxide prepared by the hydrothermal method at different temperatures, the specific steps are as follows:

[0054] (1) Place the green tungsten oxide material in the first reaction chamber 1 and the second reaction chamber 2;

[0055] (2) Unscrew the first valve 10 and the fourth valve 13 to evacuate the reaction chamber;

[0056] (3) Tighten the first valve 10, unscrew the third valve 12, fill in 0.2MPa inert gas, and clean the reaction chamber; repeat the above steps 3 to 5 times, then tighten the first valve 10 and the third valve 12 ;

[0057] (4) Select hydrogen as reducing agent, unscrew the second valve 11, feed 0.4MPa H in the reaction chamber 2 , wait for the reading of the second pressure gauge 15 to be stable, then tighten the fourth valve 13 and the fifth valve 14;

[0058] (5) Turn on the first heating device 3, the heating rate is 5°C / min, the reacti...

Embodiment 3

[0062] Using the device of the present invention to simultaneously heat-treat yellow commodity tungsten oxide under different temperature and different atmosphere conditions, the specific steps are as follows:

[0063] (1) Place the yellow tungsten oxide material in the first reaction chamber 1 and the second reaction chamber 2;

[0064] (2) Unscrew the first valve 10 and the fourth valve 13 to evacuate the reaction chamber;

[0065] (3) Tighten the first valve 10, unscrew the third valve 12, fill in 0.2MPa inert gas, and clean the reaction chamber; repeat the above steps 3 to 5 times, then tighten the first valve 10 and the third valve 12 ;

[0066] (3) Adopt step-by-step processing to control the reaction conditions of each reaction chamber, unscrew the first valve 10 and the fifth valve 14, and vacuumize the first reaction chamber 1 and the second reaction chamber 2; the vacuuming ends, Tighten the fifth valve 14 to keep the first reaction chamber 1 vacuum;

[0067] (4) ...

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PUM

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Abstract

The invention belongs to the technical field of new material preparation, and particularly relates to a device for preparing oxygen vacancies of catalytic materials. The device comprises a reaction cavity, a vacuum pump, an inert gas tank, a reducing gas tank and a gas premixing chamber, and the vacuum pump, the reaction cavity, the inert gas tank and the reducing gas tank are communicated with the gas premixing chamber through valves. By adjusting the valve, the vacuum pump vacuumizes the reaction cavity, the reaction cavity is cleaned through inert gas, and reducing gas is introduced into the reaction cavity, so that oxygen vacancy manufacturing is achieved. According to the invention, vacuum heat treatment and controllable preparation of oxygen vacancies are integrated together, so that the material treatment time and steps are greatly shortened, and nano photocatalysts with different crystal structures and rich oxygen vacancies can be prepared.

Description

technical field [0001] The invention belongs to the technical field of new material preparation, and in particular relates to a device and a preparation method for preparing oxygen vacancies of catalytic materials. Background technique [0002] As a new class of semiconductor materials, oxide catalysts have high physical, chemical and thermal stability. For this type of material, we don’t want to have a perfect crystal phase and high crystallinity. Oxides with more defect sites in the lattice have better catalytic performance. Therefore, it is often necessary to add some electronic additives during the preparation process to increase Its vacancies increase its electron transport rate. Oxygen vacancies are the most important kind of defect sites. There are certain oxygen vacancies in the crystal structure, which can have special properties such as near-far infrared absorption, photochromism and photoelectrocatalysis. Studies have shown that under the conditions of visible l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/30B01J35/00B01J35/02B01J37/08B01J37/16B01J37/18B01J6/00
CPCB01J23/10B01J23/30B01J37/18B01J37/16B01J37/08B01J35/026B01J35/0013B01J35/004B01J6/00
Inventor 张怀伟鲍亮陈逸凡裴浪吴诗婷白王峰元勇军
Owner HANGZHOU DIANZI UNIV
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