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Silver-supported nano manganese dioxide catalyst and preparation method and application thereof

A nano-manganese dioxide and manganese dioxide technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of expensive catalysts, achieve low cost, large processing capacity, and simple preparation process Effect

Inactive Publication Date: 2011-09-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both patents use expensive precious metals such as platinum and gold, and the catalyst is very expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Preparation of regular crystal nano-OMS-2, the preparation method is as follows:

[0023] (1) Weigh 10.234g MnSO respectively 4 ·H 2 O and 6.231 g KMnO 4 . Then take two 250ml beakers, weigh 10.234g MnSO 4 ·H 2 O was dissolved in water to prepare an aqueous solution with a mass concentration of 6.5%, and then weighed 6.231g KMnO 4 It is prepared into an aqueous solution with a mass concentration of 6.4%, which is stored separately for subsequent use;

[0024] (2) Take a 1000ml three-necked flask, and prepare 6.5% MnSO -4 Add the aqueous solution into the three-necked flask, heat the oil bath to 105°C, turn on the magnetic stirrer, and slowly drop in the previously prepared 6.5% KMnO 4 Aqueous solution, maintaining the temperature of the oil bath, stirred and refluxed for 24h. After the reaction was finished, it was suction filtered and washed with hot water, and the obtained precipitate was dried at 110°C for 12 hours, and then calcined at 500°C for 4 ...

Embodiment 2

[0026] Example 2 A quartz tube with an inner diameter of 8mm was used as a continuous flow reaction evaluation device (Figure 1), and 0.2g of nano-manganese dioxide carrier was weighed in the quartz tube. The mass flow meter adjusted the formaldehyde concentration to 400ppm, and the formaldehyde gas was driven into the tube by air flow. Mixer, adjust the total air flow rate to 100ml / min. The results are shown in Table 1.

Embodiment 3

[0027] Example 3 Oxidation-reduction reaction Loading metal silver to obtain a loaded manganese-based catalyst, the preparation method is as follows:

[0028] (1) Prepare silver ammonia solution, the steps are as follows: prepare 1.5% AgNO 3 solution, save for later use. Prepare 10% ammonia solution. Then the prepared NH 3 ·H 2 O solution was slowly added dropwise to the above 1.5% AgNO 3 In the solution, shake while adding dropwise until the solution turns from cloudy to clear. The solution that makes now is silver ammonia solution;

[0029] (2) Take the nano-α-MnO with regular crystal form prepared by the above-mentioned reflux method 2 In 50ml of aqueous solution, add 2ml of newly prepared silver ammonia solution under stirring condition. Then add 100ml of commercial 30% H2 dropwise 2 o 2 Aqueous solution until the reaction is complete, stirred for 30min, filtered and washed, dried at 110°C for 12h, and calcined at 500°C for 4h to obtain Ag / MnO 2catalyst.

[0030...

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PUM

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Abstract

The invention belongs to the technical field of chemical catalysts, and particularly relates to a silver-supported nano manganese dioxide catalyst and a preparation method and application thereof. The active ingredient of the catalyst is silver-supported doped manganese dioxide molecular sieve (OMS-2) formed by directionally doping metallic silver into nano manganese dioxide molecular sieve pores; and the supporting amount of the metallic silver is 1 to 25 percent. The catalyst can be used for catalyzing oxidation reaction of formaldehyde at a low temperature, and the formaldehyde can be fully oxidized into carbon dioxide and water under the low-temperature condition so as to remove the formaldehyde; the concentration of the formaldehyde is 1.5 to 2,000ppm; and the full catalytic oxidation temperature of the formaldehyde is 0 to 120 DEG C. The catalyst can be used for removing formaldehyde pollutants from closed systems such as vehicles and rooms.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, and in particular relates to a silver-loaded nano-manganese dioxide catalyst, a preparation method thereof, and an application of the catalyst in low-temperature catalytic oxidation of formaldehyde. Background technique [0002] Modern buildings, car interior decoration and furnishings are increasingly associated with materials containing formaldehyde, which leads to an increase in the concentration of formaldehyde in the car or indoor air, seriously reducing the quality of the car or indoor air. The International Agency for Research on Cancer (IARC) of the World Health Organization issued the No. 153 bulletin, which pointed out that formaldehyde can cause human cancer. Studies have shown that formaldehyde is a highly toxic substance. Short-term exposure to formaldehyde can irritate the eyes, nasal cavity and respiratory tract and cause allergic reactions; long-term exposure to low-dos...

Claims

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Application Information

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IPC IPC(8): B01J29/00C01B31/20C01B5/00C01B32/50
Inventor 曹青青唐幸福黄志伟孙亮胡冰清杨兴业操婧婷
Owner FUDAN UNIV
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