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High-defect cobaltosic oxide catalyst for catalytic oxidation of formaldehyde as well as preparation method and application thereof

A tricobalt tetroxide catalyst and technology of tricobalt tetroxide, applied in the direction of metal/metal oxide/metal hydroxide catalyst, cobalt oxide/cobalt hydroxide, physical/chemical process catalyst, etc., can solve the problem of high price of precious metals, easy deactivation and wide use problems, to achieve the effect of large specific surface area, excellent formaldehyde catalytic oxidation performance, and easy-to-obtain raw materials

Active Publication Date: 2021-01-26
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A lot of research has been done on catalysts for the catalytic combustion of formaldehyde at home and abroad. Noble metal (Pt, Pd, Au, etc.) catalysts have shown excellent low-temperature catalytic oxidation activity, but the disadvantages of expensive metals and easy deactivation limit their use. Widely used, so finding efficient non-precious metal catalysts is a current research hotspot

Method used

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  • High-defect cobaltosic oxide catalyst for catalytic oxidation of formaldehyde as well as preparation method and application thereof
  • High-defect cobaltosic oxide catalyst for catalytic oxidation of formaldehyde as well as preparation method and application thereof
  • High-defect cobaltosic oxide catalyst for catalytic oxidation of formaldehyde as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Flake Co 3 o 4 preparation of

[0032] 40ml 0.5 mol / L Co(NO 3 )·6H 2 O and 1mol / L ammonia water are dropped into 300ml deionized water at 60°C at the same time to keep the pH value at 7-9. After the addition, continue to stir and age for 1h, centrifuge to obtain a precipitate, wash until neutral, and bake in an oven at 60°C for 12h. Baked at 300°C for 3 hours in a muffle furnace to obtain flake cobalt tetroxide (Co 3 o 4 ).

[0033] figure 1 For the Co prepared in Example 1 3 o 4 TEM image of figure 1 Shows Co 3 o 4 shape of the nanosheets.

Embodiment 2

[0034] Example 2 High-defect flake cobalt tetroxide catalyst H-Co for catalytic oxidation of formaldehyde 3 o 4 preparation of

[0035] 0.2g of the Co prepared in Example 1 3 o 4 Dissolve in 60mL of 4mol / L hydrochloric acid solution, stir for 3h, wash with a large amount of deionized water to pH = 7, and dry overnight in an oven at 60°C to obtain highly defective tricobalt tetroxide (H-Co 3 o 4 ).

[0036] figure 2 For the H-Co prepared in Example 2 3 o 4 TEM image of figure 2 It shows that many small holes appear on the surface of the material after pickling treatment, which proves that the exposed surface increases after pickling.

[0037] image 3 For the Co prepared in Example 1 3 o 4 And the H-Co that embodiment 2 prepares 3 o 4 The XRD spectrum, from image 3 It can be seen that the crystal phase of the flaky cobalt trioxide before and after pickling has not changed.

[0038] Figure 4 For the Co prepared in Example 1 3 o 4 And the H-Co that embodiment...

Embodiment 3

[0042] Example 3 Cobalt Tetroxide Catalyst H-Co for Catalytic Oxidation of Formaldehyde 3 o 4 Catalytic Oxidation of Formaldehyde

[0043] 0.1 g of the catalysts in Examples 1-2 were used respectively, and were loaded into a fixed-bed reactor at a mass space velocity of 100,000 mL / g / h to measure the conversion rate of formaldehyde, and the concentration of formaldehyde in the tail gas was determined by gas chromatography. The composition of the reflected gas is: 2% formaldehyde, 20% oxygen, and nitrogen as the balance gas. The conversion effect of the catalyst on formaldehyde was measured at 20-250°C, and the test results are shown in Figure 7 , at a space velocity of 100000 mL / g / h, the performance of the pickled material was significantly improved compared with that before treatment.

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Abstract

The invention discloses a high-defect cobaltosic oxide catalyst for catalytic oxidation of formaldehyde as well as a preparation method and application thereof, which belong to the technical field ofpreparation of nano materials. According to the technical scheme, the preparation method comprises the following steps: (a) preparing flaky cobaltosic oxide; (b) performing acid etching on the flaky cobaltosic oxide to obtain the high-defect catalyst: adding the flaky cobaltosic oxide in the step (a) into a diluted hydrochloric acid solution, and then stirring, washing and drying to obtain the high-defect cobaltosic oxide for formaldehyde catalytic oxidation. According to the invention, cobalt nitrate hexahydrate is used as a precursor, precipitation reaction is carried out in an alkaline environment, and then roasting is carried out at high temperature to obtain the flaky cobalt oxide; the flaky cobalt oxide is subjected to acid treatment to obtain the high-defect cobaltosic oxide for catalytic oxidation of formaldehyde, and the high-defect cobaltosic oxide has a larger specific surface area, more surface defects and active sites and a more acidic surface, shows excellent catalytic oxidation performance of formaldehyde, and has great potential in the aspect of replacement of noble metal catalysts.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a high-defect cobalt tetroxide catalyst used for catalytic oxidation of formaldehyde, a preparation method and application thereof. Background technique [0002] Formaldehyde is a typical carcinogenic indoor air pollutant, which is continuously released from decorative materials and wooden furniture, and is recognized as a serious hazard to human health. Effective removal of formaldehyde in indoor air has become an important topic in environmental science. In order to prevent formaldehyde pollution, effective treatment of formaldehyde is an urgent problem to be solved. [0003] At present, the removal of formaldehyde in indoor air mainly adopts adsorption method and catalytic oxidation method. Although the adsorption method is simple and economical, the capacity of the adsorbent is limited, and formaldehyde will form secondary pollution after adsorption and satu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C01G51/04F23G7/07
CPCB01J23/75C01G51/04F23G7/07C01P2002/72C01P2002/85C01P2006/12F23G2209/14Y02A50/20
Inventor 李星运包留瑞朱善辉赵修松
Owner QINGDAO UNIV
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