Method for preparing manganese dioxide catalyst for normal-temperature low-concentration NO catalytic purification with ultrasonic assisted alcohol-water solution method

A catalytic purification, nano-manganese dioxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low preparation efficiency and short catalytic life. , to achieve the effect of simple operation, low cost and shortening the preparation time

Inactive Publication Date: 2016-02-17
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the present invention aims to solve the technical bottlenecks of low preparation efficiency and short catalytic life of existing room temperature low-concentration nitric oxide catalytic oxidation catalysts

Method used

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  • Method for preparing manganese dioxide catalyst for normal-temperature low-concentration NO catalytic purification with ultrasonic assisted alcohol-water solution method
  • Method for preparing manganese dioxide catalyst for normal-temperature low-concentration NO catalytic purification with ultrasonic assisted alcohol-water solution method
  • Method for preparing manganese dioxide catalyst for normal-temperature low-concentration NO catalytic purification with ultrasonic assisted alcohol-water solution method

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preparation example Construction

[0028] Among the many preparation methods of manganese oxides, the present invention selects a simple and convenient oxidation-reduction method. By adjusting raw material components and process parameters and introducing ultrasonic treatment, the rapid preparation of manganese oxides can be realized, and the normal temperature and low concentration NO The removal performance has been significantly improved, and the 100% NO removal rate can be maintained for more than 5 hours. The invention provides a method for preparing nano-catalyst manganese dioxide used for catalytic purification of nitrogen monoxide (NO) with low concentration at normal temperature-ultrasound-assisted redox method of alcohol aqueous solution. Specifically, potassium permanganate and alcohol are used as raw materials, and manganese dioxide is obtained after ultrasonic treatment, suction filtration, washing, and drying. In one example, potassium permanganate solution of a certain concentration is added drop...

Embodiment 1

[0041] Weigh 1.58gKMnO 4 Dissolve in 10mlH 2 O, placed in a 40°C water bath and stirred to dissolve. Measure 10ml of ethanol into a jar. Mix KMnO on a magnetic stirrer 4 The solution was added dropwise into ethanol, and after a period of time, it was placed in an ultrasonic reaction cell at 30°C for 20 minutes, filtered and washed with deionized water, and dried in an oven at 80°C for 14 hours. The XRD diffraction pattern of the prepared catalyst is attached figure 1 As shown, it can be seen that the prepared MO is in a weakly crystallized state, with a certain peak shape but not particularly obvious, so it is not possible to completely distinguish its type. Therefore, we calcined the sample at a certain temperature and then used XRD to characterize it. , the peak position and peak shape of the comparison sample are consistent with PDF#44-0141, indicating that the sample is tetragonal MnO 2 . SEM photos are attached figure 2 As shown, it can be seen that the morphology...

Embodiment 2

[0045] Weigh 1.58gKMnO respectively 4 Dissolve in 10mlH 2 O, placed in a 40°C water bath and stirred to dissolve. Measure 10ml of ethanol into a jar. Mix KMnO on a magnetic stirrer 4 The solution was added dropwise into ethanol, and after a period of time, it was put into an ultrasonic reaction cell at 30°C for ultrasonication, and the ultrasonic time was 0 min, 20 min, 40 min, and 60 min, respectively. Then, it was filtered and washed with deionized water, and dried in an oven at 80°C for 14 hours. The NO removal performance curve of the prepared catalyst is shown in the attached Figure 6 As shown, it can be seen that when the ultrasonic time is 20 min and 40 min, the 100% catalytic purification of NO can be maintained for more than 10 hours.

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Abstract

The invention relates to a method for preparing a manganese dioxide catalyst for normal-temperature low-concentration NO catalytic purification with an ultrasonic assisted alcohol-water solution method. According to the method, a mixed solution formed through mixing of a potassium permanganate solution and alcohol is subjected to ultrasonic treatment for 10-60 min, solid-liquid separation is performed, acquired solids are dried, and the nano-manganese dioxide catalyst is prepared. According to the method, the ultrasonic assisted alcohol-water solution oxidation-reduction method is adopted to prepare the nano-manganese dioxide catalyst, the alcohol is taken as a raw material, and the cost is low; the oxidation-reduction method is adopted, and the operation is simple and convenient; by means of the ultrasonic treatment, not only is the NO removal performance remarkably improved, but also the preparation time is greatly shortened; the catalyst prepared with the method has excellent catalytic performance, and 100% NO removal rate can be kept for longer than 5 h under the fixed test condition.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for catalytic purification of low-concentration nitric oxide used in a semi-enclosed space, and belongs to the technical field of catalytic materials. Background technique [0002] Nitrogen oxides NOx (mainly referring to NO and NO 2 ) is an extremely harmful air pollutant, which has a direct impact on the formation of photochemical smog and acid rain, and seriously damages the ecological environment. In addition, nitrogen oxides can also cause lung cancer and other respiratory diseases, threatening human health. [0003] In order to expand urban capacity and alleviate traffic pressure, tunnels, underground parking lots, etc. have been continuously expanded. These semi-enclosed spaces have poor air circulation, and motor vehicle exhaust gas stays inside and becomes a concentration of pollutants. The concentration of its main pollutant nitrogen oxides NOx (NO accounts for more than 90%) is as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/10B01J37/04B01D53/86B01D53/56
Inventor 刘艳陈航榕黄为民施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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