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Difunctional nanorod-like manganese oxide catalyst as well as preparation method and application thereof

A manganese oxide and nano-rod technology, which is applied in the field of nano-rod manganese oxide catalyst and its preparation, can solve the problems of active component vanadium toxicity, human health and environmental hazards, and achieve low price, low cost, and catalytic removal performance Good results

Pending Publication Date: 2022-05-13
ZHEJIANG SHUREN COLLEGE ZHEJIANG SHUREN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vanadium pentoxide / titanium dioxide and vanadium pentoxide-tungsten trioxide (molybdenum trioxide) / titanium dioxide catalysts mainly used in commerce have good denitrification activity, but there are still some shortcomings in this type of catalyst: the active component vanadium Toxic, harmful to human health and the environment
[0004] In the prior art, the general catalysts can only remove nitrogen oxides or organic matter accordingly, so it is urgent to develop a catalyst that can effectively remove nitrogen oxides and dichloroethane. Preparation method of bifunctional manganese oxide

Method used

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  • Difunctional nanorod-like manganese oxide catalyst as well as preparation method and application thereof
  • Difunctional nanorod-like manganese oxide catalyst as well as preparation method and application thereof
  • Difunctional nanorod-like manganese oxide catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 0.02mol Mn(CH 3 COO) 2 4H 2 O and 0.02mol KMnO 4 Add it into 160mL distilled water, stir it with a magnetic stirrer for 0.5h to make it fully mixed; pour the evenly mixed liquid into the reaction kettle, and hydrothermally treat it at a temperature of 140°C for 12h; then let it stand at room temperature; filter the mixed liquid, And repeated washing with ethanol and deionized water for 3 times in sequence, after drying the filtered sediment at 80°C for 12h, the dried precipitate (sample) was collected in a crucible and put into a muffle furnace, at 450°C Calcined for 4 hours under temperature conditions; then tabletted, crushed, and sieved to 50 mesh to obtain a nanorod-shaped manganese oxide catalyst with dual functions for removing nitrogen oxides and dichloroethane, denoted as α-MnO x -1 Catalyst.

[0026] α-MnO x The scanning electron microscope picture of -1 catalyst is as follows figure 1 shown, from figure 1 It can be seen that the catalyst prepared in thi...

Embodiment 2

[0028] 0.02mol Mn(CH 3 COO) 2 4H 2 O and 0.02mol KMnO 4 Add it into 160mL distilled water, stir it with a magnetic stirrer for 0.5h to make it fully mixed; pour the evenly mixed liquid into the reaction kettle, and hydrothermally treat it at a temperature of 90°C for 24h; then let it stand at room temperature; filter the mixed liquid, Repeated washing with ethanol and deionized water for 3 times, dried the filtered sediment at 80°C for 12 hours, collected the dried samples into a crucible and put them in a muffle furnace, and calcined them for 4 hours at a temperature of 450°C; Through tableting, crushing, and sieving with 50 meshes, a nanorod-shaped manganese oxide catalyst with dual functions for removing nitrogen oxides and dichloroethane is obtained, which is denoted as α-MnO x -2 Catalyst.

[0029] α-MnO x The scanning electron microscope picture of -2 catalyst is as follows figure 2 shown, from figure 2 It can be seen that the catalyst prepared in this example h...

Embodiment 3

[0035] The catalyst prepared by 0.6g embodiment 1 and embodiment 2 is placed in a fixed bed reactor and carries out HC-SCR catalytic activity evaluation, experimental condition is: NO volume concentration is 800ppm, C 3 h 8 The volume concentration is 600ppm, O 2 Volume concentration is 6.5%, N 2 For balance gas, the total gas flow is 450mL min -1 , airspeed is 19000h -1 , The reaction temperature is 150-550°C.

[0036] Detecting NO Using Infrared Gas Analyzers x Concentration, activity of the catalyst at different temperatures, see Table 2.

[0037] The activity of catalyst catalytic reduction of nitrogen oxides under different temperatures when table 2 oxygen content is 6.5%

[0038]

[0039] As can be seen from Table 2, the α-MnO prepared in Example 1 x -1 Catalyst can make NO at 200℃ x Conversion rate reaches 33.4%, the α-MnO that embodiment 2 makes x -2 Catalyst can make NO at 250℃ x The conversion rate reached 60.1%.

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Abstract

The invention relates to a difunctional nanorod-like manganese oxide catalyst and a preparation method and application thereof. Manganese acetate and potassium permanganate are mixed and stirred and then subjected to hydrothermal treatment; carrying out suction filtration, washing and drying to obtain a precipitate, putting the precipitate into a muffle furnace, and calcining for 4-5 hours at the temperature of 400-500 DEG C; and tabletting, crushing and sieving to obtain the difunctional composite manganese oxide catalyst for removing nitrogen oxides and dichloroethane. The catalyst prepared by the invention is of a regular nanorod-like structure, and can efficiently remove nitrogen oxides and dichloroethane at 200-400 DEG C. The difunctional nanorod-like manganese oxide catalyst prepared by the invention has good catalytic removal performance on nitrogen oxide and dichloroethane, and the removal rates can reach 60.1% and 100% respectively.

Description

technical field [0001] The invention belongs to the technical field of pollution control, and in particular relates to a double-functional nanorod-shaped manganese oxide catalyst and its preparation method and application. Background technique [0002] Nitrogen oxide (Nitrogen oxide, referred to as NO x ) and volatile organic compounds (VOCs) are extremely harmful. Nitrogen oxides and chlorinated volatile organic compounds can cause acid rain, photochemical smog, low-altitude ozone, smog, etc., affect the ecological environment and endanger human health, etc. environmental issue. Therefore, denitrification technology and the removal of chlorine-containing volatile organic compounds are hot spots in the field of pollution control. At present, the flue gas denitrification technology at home and abroad is mainly the selective catalytic reduction method. The vanadium pentoxide / titanium dioxide and vanadium pentoxide-tungsten trioxide (molybdenum trioxide) / titanium dioxide cat...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/56B01D53/72
CPCB01J23/34B01D53/8628B01D53/8668
Inventor 潘华凌鑫陈浚叶志平
Owner ZHEJIANG SHUREN COLLEGE ZHEJIANG SHUREN UNIV
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