Manganese oxide material and preparation method thereof

A technology of manganese oxides and compounds, applied in the field of catalytic materials and environmental protection, can solve the problems of short life, difficult regeneration, and inability to remove pollutants at the same time

Pending Publication Date: 2018-01-09
QIANDONG RARE EARTH GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] These existing technologies exist and have poor performance under high humidity conditions, and cannot simultaneously remove common CO, VOCs, and O in indoor environments. 3 and other pollutants, expensive raw materials, complex preparation methods, difficult to realize industrialization, low activity, low efficiency, short life, unstable, difficult regeneration, easy to absorb moisture and other defects

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  • Manganese oxide material and preparation method thereof
  • Manganese oxide material and preparation method thereof
  • Manganese oxide material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0096] see figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 . With 202.8 parts (weight, the same below) MnSO 4 ·H 2 O was dissolved in deionized water, and 126.4 parts of KMnO 4 , adjusted with NaOH and kept the pH above 12, kept the temperature at 50°C, and stirred for 2h. Then add 142.2 parts of MnSO 4 H2O, control the pH to 8-9, and stir at 50°C for 2 hours to obtain precipitate A. Then adjust the SO with sulfuric acid 4 2- Concentration of about 1mol / L, stirring at 50°C for 2h, to obtain precipitate B. Add CuSO after washing and filtering 4 、LaCl 3 , CeCl 3 , adjusted to pH 7-8, stirred for 2 hours to obtain precipitate C, washed and filtered, and dried to obtain manganese oxide material.

[0097]The content of each metal element detected by ICP and the chemical composition of the surface of the manganese oxide material measured by electron probe analysis (EDS) are shown in Table 1 (when the contents of each percentage are no...

Embodiment 2

[0132] see Figure 8 , Figure 9 , Figure 11 .

[0133] 190.4 parts MnCl 2 Dissolve and add 54.2 parts of sodium chlorate while stirring at 45°C while keeping the pH to 3-5. Then adjust the pH to 7 with potassium carbonate, then add 135.2 parts of MnSO 4 ·H 2 O, keep the temperature at 40 ° C and stir for 2.5h to obtain precipitate B. Precipitate B was washed, filtered and dried to obtain manganese oxide material I. After washing and filtering the precipitate B, add CuSO 4 The solution was stirred, adjusted to pH 8-9 with NaOH, washed after 2 hours, filtered and dried to obtain manganese oxide material II.

[0134] The contents of each metal element in manganese oxide materials Ⅰ and Ⅱ detected by ICP are shown in Table 6. After doping with copper, the active sites and vacancy defects are increased, showing better catalytic activity.

[0135] Y(Mn 2+ ) / Y(Mn 4+ ) = 0.18. mn 2+ After being adsorbed by manganese dioxide, a part is oxidized to Mn due to surface auto...

Embodiment 3

[0157] see Figure 10 , Figure 12 .

[0158] 336.4 parts of MnCl 2 Dissolve in deionized water. At 20°C, with NH 3 ·H 2 O to adjust the pH to 10, while stirring, hydrogen peroxide was added dropwise to produce substantially no foam. Then with 338.4 parts of MnSO 4 ·H 2 O mixed and adjusted the pH of the system to 7.5, stirred at room temperature for 8h. Then adjust SO with sulfuric acid and ammonium sulfate 4 2- The concentration is about 0.1mol / L, stirred at room temperature for 3 hours, washed, filtered and dried to obtain manganese oxide material.

[0159] The use of sulfuric acid when adjusting the sulfate concentration can reduce or eliminate the impurity Mn(OH) 2 . Because Mn(OH) 2 Easy hydration, resulting in high water absorption of manganese oxides, affecting the performance of manganese oxides. Using sulfuric acid and ammonium sulfate to adjust the sulfate concentration can form a buffer solution, which is beneficial to the stability of the system.

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Abstract

The invention relates to a manganese oxide material, and belongs to the technical field of catalytic materials and environmental protection. The manganese oxide material comprises manganese dioxide, wherein the valence form of the manganese element includes divalent manganese and tetravalent manganese; the proportion between divalent manganese and tetravalent manganese is 0<Y(Mn<2+>) / Y(Mn<4+>)<1.The manganese oxide material has a ball-shaped structure formed by nanorods and a favorable pore canal. The manganese oxide material has the advantages that the heat endurance in use is good; the specific surface area is large; the adsorption capability and the ion exchange capacity is strong; the catalytic activity under a high humidity condition is high; the life is long; hazardous materials such as CO (carbon monoxide), VOCs (volatile organic compounds), O3 (ozone) and the like can be solely removed or removed at the same time; staphylococcus and the like can be killed. The manganese oxidematerial preparation method has the advantages of being green and environmentally friendly, simple and easy to perform, extensive in raw material resource, low in cost, and easy for realizing industrialization.

Description

technical field [0001] The invention relates to a manganese oxide material and its preparation and use method. The invention belongs to the technical field of catalytic materials and environmental protection. Background technique [0002] Manganese oxide is an important functional oxide material with rich sources, cheap price, non-toxic and harmless, and has a wide range of applications in catalytic oxidation, heavy metal adsorption, magnetism and batteries. At present, the methods for preparing manganese oxides include solid-state reaction method, hydrothermal method, sol-gel method, liquid phase precipitation method, etc. Different preparation methods can obtain manganese oxides with different crystal structures and morphologies. There are great differences in the use of manganese oxides with different crystal structures and morphologies. The manganese oxide used in the catalyst has excellent catalytic ability due to its different morphology. [0003] With the improveme...

Claims

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Application Information

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IPC IPC(8): C01G45/12B82Y40/00B82Y30/00
Inventor 龚斌袁招莲刘征官刘明彪谢楠黄绍权
Owner QIANDONG RARE EARTH GRP
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