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Cr2O3 thermal catalyst with oxygen defect, and preparation method and application of Cr2O3 thermal catalyst

A catalyst, oxygen deficiency technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. It is not high enough to achieve the effect of improving thermal catalytic activity, simple operation and cheap raw materials.

Active Publication Date: 2019-02-22
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of photocatalysis, if there is no or lack of ultraviolet light, the degradation process will be difficult
Current photocatalytic quantum efficiencies are not high enough from an application point of view, so little progress has been made in industrial applications

Method used

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  • Cr2O3 thermal catalyst with oxygen defect, and preparation method and application of Cr2O3 thermal catalyst
  • Cr2O3 thermal catalyst with oxygen defect, and preparation method and application of Cr2O3 thermal catalyst
  • Cr2O3 thermal catalyst with oxygen defect, and preparation method and application of Cr2O3 thermal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 has the dichromium trioxide thermal catalyst of oxygen defect

[0023] (1) Preparation method

[0024] Put 2g of chromium nitrate nonahydrate into a crucible, and in an inert gas environment or an air environment, carry out calcination in a muffle furnace at 500°C with a heating rate of 5°C / min, keep it for 2 hours, cool naturally, and grind to obtain the product: Chromium trioxide thermal catalyst with oxygen deficiency, the product is denoted as A500.

[0025] (2) Detection

[0026] figure 1 For the A500XRD figure that embodiment 1 prepares, by figure 1 It can be seen that the sample has three diffraction peaks at 24.5°, 33.7° and 36.3°, which are characteristic peaks of dichromium oxide, which proves that the prepared sample is dichromium oxide.

[0027] figure 2 For the UV-vis figure of the A500 prepared in embodiment 1, by figure 1 Visible, Cr 2 o 3 Four absorption bands are exhibited at 239, 373, 464 and 596nm, the prepared A500 thermal catal...

Embodiment 2

[0028] Embodiment 2 has the dichromium trioxide thermal catalyst of oxygen defect

[0029] (1) Preparation method

[0030] Put 2g of chromium nitrate nonahydrate into a crucible, and calcine in a muffle furnace at 900°C in an inert gas environment or an air environment, with a heating rate of 5°C / min, keep it for 2 hours, cool naturally, and grind to obtain the product: Chromium trioxide thermal catalyst with oxygen deficiency, the product is recorded as A900.

[0031] (2) Detection

[0032] image 3 For the A900XRD pattern prepared in embodiment 2, by image 3 It can be seen that the sample has three diffraction peaks at 24.5°, 33.7° and 36.3°, which are characteristic peaks of dichromium oxide, which proves that the prepared sample is dichromium oxide. Compared with the A500XRD pattern prepared in Example 1, the peak intensity is obviously enhanced, indicating that as the temperature increases, the crystallinity of the sample is also better.

[0033] Figure 4 For the ...

Embodiment 3

[0035] Example 3 application

[0036] Cr with oxygen deficiency 2 o 3 Oxygen vacancies in thermal catalysts can effectively adsorb pollutants and undergo oxidation reactions, thereby degrading pollutants.

[0037] Depend on Figure 5 It can be seen that at the same temperature, the prepared oxygen-deficient chromium oxides A500 and A900 are degraded isopropanol per minute rate activity graph, and it can be seen that the catalytic activity of the prepared oxygen-deficient A500 thermal catalyst is higher than the sample activity of A900 The A500 sample is about 110 times faster than the A900 sample in degrading isopropanol, because the A500 sample has more oxygen defects than the A900 sample, which can adsorb pollutants and is more prone to oxidation reactions, so the degradation rate of isopropanol is higher. high.

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PUM

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Abstract

The invention discloses a Cr2O3 thermal catalyst with an oxygen defect material, and a preparation method and application of the Cr2O3 thermal catalyst. The preparation method comprises the followingsteps that an oxygen-enriched chromium-containing compound is put into a crucible to be subjected to be high-temperature calcination treatment in an inert gas environment or an air environment, then cooled and ground, and thus a Cr2O3 thermal catalyst product with the oxygen defect is obtained. A chromium oxide material with the oxygen defect is prepared through the preparation method, the oxygendefect can effectively adsorb pollutants to be subjected to an oxidizing reaction, thus thermocatalytic activity is improved, and in addition, the higher the concentration of the oxygen defect is, thebetter the organic pollutant degrading effect at the same temperature is. By utilizing the obtain the thermal catalyst, the gaseous organic pollutants can be effectively degraded at the low temperature.

Description

technical field [0001] The invention belongs to the technical field of thermal catalytic materials, and in particular relates to a chromium oxide thermal catalyst with oxygen defects, a preparation method and application thereof. Background technique [0002] With the development of human society, the problem of environmental pollution has become increasingly prominent and needs to be solved urgently. Among the many environmental purification methods, various catalytic environmental purification technologies have attracted much attention. In recent years, photocatalysis has received great attention from scientific researchers, and has a wide range of applications in the fields of degradation of organic pollutants and reduction of nitrogen oxides. However, in the photocatalytic process, if there is no or lack of ultraviolet light, the degradation process will be difficult. The current photocatalytic quantum efficiency is not high enough from the application point of view, so...

Claims

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Application Information

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IPC IPC(8): B01J23/26B01J37/08B01D53/86B01D53/72B01D53/44
CPCB01D53/8668B01D53/8687B01D2257/704B01J23/26B01J37/088
Inventor 范晓星蔡鹤王晓娜成祥祥裴宇鹏韩宇王绩伟
Owner LIAONING UNIVERSITY
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