Mesoporous Ag2O-MnO2 catalyst, preparation method thereof and application of catalyst

A catalyst and mesoporous technology, applied in the field of chemistry, can solve the problems of catalyst production and popularization restrictions and high cost

Inactive Publication Date: 2017-10-10
CHINESE RES ACAD OF ENVIRONMENTAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pt / TiO 2 Catalysts have been used in air purifiers, but the disadvantage is that the cost is too high, and the production and popularization of catalysts are limited

Method used

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  • Mesoporous Ag2O-MnO2 catalyst, preparation method thereof and application of catalyst
  • Mesoporous Ag2O-MnO2 catalyst, preparation method thereof and application of catalyst
  • Mesoporous Ag2O-MnO2 catalyst, preparation method thereof and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] This example provides mesoporous Ag 2 O-MnO 2 Catalyst, it is prepared according to the following steps:

[0065] Step 1: Add 8.0g KIT-6 mesoporous silicon to 80ml, 0.91mol / L Mn(NO 3 ) 2 4H 2 O ethanol solution, after excessive impregnation and ultrasonic vibration, evaporate excess ethanol at 50°C, dry at 100°C, and roast at 200°C to obtain a mesoporous manganese oxide precursor; add the gained mesoporous manganese oxide precursor to 80ml, 0.91mol / L of Mn(NO 3 ) 2 4H 2 In O ethanol solution, after excessive impregnation and ultrasonic vibration, the excess ethanol was evaporated at 50°C, then dried at 100°C and calcined at 380°C to obtain a mesoporous manganese oxide precursor with a high filling degree. The mesoporous manganese oxide precursor was soaked in 2.0 mol / L NaOH solution, stirred by magnetic force for 60 min, and filtered to obtain a filter cake. The filter cake was soaked once more in the same NaOH solution, stirred by magnetic force for 60 min, and...

Embodiment 2

[0070] Step 1: Mesoporous MnO in this example 2 The preparation method and process parameters of the powder are the same as in Example 1.

[0071] Step 2: 1g of mesoporous MnO 2 Add the powder into the silver ammonia solution (0.016g of silver nitrate, 15ml of ammonia water with a mass fraction of 28%), and stir rapidly to form a mixed slurry. Then slowly add 15ml of hydrogen peroxide (mass concentration 30%) to make it react with the mixed slurry and release gas. After stirring for 120min, it is filtered 3 times, dried at 90°C, and roasted at 400°C to obtain mesoporous Ag. 2 O-MnO 2 catalyst.

[0072] Using XRD to study the above mesoporous Ag 2 O-MnO 2 The powder was tested to characterize the presence of a silver oxide crystalline phase. It is beneficial for SEM to observe mesoporous Ag 2 O-MnO 2 surface structure features.

[0073] image 3 and Figure 4 Mesoporous Ag 2 O-MnO 2 XRD spectrum and SEM pattern of the catalyst. The XRD spectrum shows that there is...

Embodiment 3

[0075] Step 1: Mesoporous MnO in this example 2 The preparation method and process parameters of the powder are the same as in Example 1.

[0076] Step 2: 1g of mesoporous MnO 2Add the powder into the silver ammonia solution (0.008g of silver nitrate, 15ml of ammonia water with a mass fraction of 28%), and stir rapidly to form a mixed slurry. Then slowly add 15ml of hydrogen peroxide (mass concentration 30%) to make it react with the mixed slurry and release gas. After stirring for 120min, it is filtered 3 times, dried at 90°C, and roasted at 400°C to obtain mesoporous Ag. 2 O-MnO 2 catalyst.

[0077] Using XRD to study the above mesoporous Ag 2 O-MnO 2 The powder was tested to characterize the presence of a silver oxide crystalline phase. Figure 5 Mesoporous Ag 2 O-MnO 2 The XRD pattern of the catalyst. The spectrogram shows that the catalyst does not have silver oxide crystal phase, indicating that the Ag 2 O is evenly dispersed.

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Abstract

The invention provides a mesoporous Ag2O-MnO2 catalyst, a preparation method thereof and an application of the catalyst. The method includes the steps: (1) mesoporous manganese dioxide preparation: taking mesoporous silicate materials as template agents, performing soaking by the aid of manganese nitrate solution, removing impregnation liquid, performing drying and calcination to obtain precursors, and removing the template agents to obtain mesoporous manganese dioxide; (2) silver oxide loading: loading the silver oxide on the mesoporous manganese dioxide acquired in the step (1) to obtain a mesoporous manganese dioxide catalyst loaded the silver oxide. The catalyst is used for removing formaldehyde, and the cost of the catalyst is low as compared with a Pt loaded catalyst with high cost.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a mesoporous Ag 2 O-MnO 2 Catalysts and their preparation and applications. Background technique [0002] Formaldehyde has been identified as carcinogenic and teratogenic substances by the International Cancer Research Center and the World Health Organization, ranking first in the list of toxic substances. The news media reported: "Children's leukemia is related to formaldehyde in indoor air." Formaldehyde is also a kind of volatile organic compounds (VOCs) with strong photochemical activity, which is very easy to combine with nitrogen oxides (NO x ) photochemical reaction to form fine particles (PM2.5), which is very harmful to human body and environment. With the improvement of people's quality of life and health standards, effectively removing indoor formaldehyde or reducing the amount of outdoor formaldehyde has become an urgent problem to be solved to improve the air environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01J35/10B01D53/86B01D53/72
CPCB01J23/688B01D53/8668B01J23/002B01J35/10
Inventor 拜冰阳乔琦李俊华郝吉明
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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