A kind of potassium-doped gamma manganese dioxide catalyst and its preparation method and application

A catalyst and catalytic oxidation technology, applied in the fields of resources and environment, can solve the problem of no manganese dioxide catalytic activity improvement and modification, and achieve the effects of increasing surface defect sites, low preparation cost and simple operation

Active Publication Date: 2020-11-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This material can increase the contact area between manganese dioxide and air, thereby improving the catalytic efficiency, but it does not improve the catalytic activity of manganese dioxide itself.

Method used

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  • A kind of potassium-doped gamma manganese dioxide catalyst and its preparation method and application
  • A kind of potassium-doped gamma manganese dioxide catalyst and its preparation method and application
  • A kind of potassium-doped gamma manganese dioxide catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] a K + doped γ-MnO 2 The preparation method of catalyst specifically comprises the following steps:

[0050] (1) Mn(NO 3 ) 2 Soluble in water, formulated as Mn 2+ The manganese solution with a concentration of 0.2mol / L is added to Mn(NO 3 ) 2 Add NH dropwise to the solution 4 HCO 3 solution, the mixture was filtered, washed and dried, and then calcined at 400°C for 4 hours in the air to obtain γ-MnO 2 ;

[0051] Among them, the NH 4 HCO 3 and Mn in manganese solution 2+ The molar ratio is 8:1;

[0052] (2) To KNO 3 γ-MnO was added to the solution 2 , after standing, washing and drying, calcined in air atmosphere at 400℃ for 4h to obtain K + doped γ-MnO 2 catalyst;

[0053] Among them, the KNO 3 and γ-MnO 2 The molar ratio is 0.5:10.

[0054] The K prepared in this example + doped γ-MnO 2 The XRD spectrum of the catalyst is as figure 1 shown.

[0055] For the K prepared in this example + doped γ-MnO 2 The performance of the catalyst was evaluated...

Embodiment 2

[0057] a K + doped γ-MnO 2 Catalyst preparation method, except KNO 3 and γ-MnO 2 Except that mol ratio is 0.1:10, all the other are identical with embodiment 1.

[0058] For the K prepared in this example + doped γ-MnO 2 The performance of the catalyst was evaluated, and the results obtained are shown in Table 1.

Embodiment 3

[0060] a K + doped γ-MnO 2 Catalyst preparation method, except KNO 3 and γ-MnO 2 Except that mol ratio is 0.25:10, all the other are identical with embodiment 1.

[0061] For the K prepared in this example + doped γ-MnO 2 The performance of the catalyst was evaluated, and the results obtained are shown in Table 1.

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Abstract

The invention provides a K<+>-doped gamma-MnO2 catalyst and a preparation method and use thereof. A main body structure of the catalyst is gamma-MnO2, and pore passages of the gamma-MnO2 are doped with K<+>. The gamma-MnO2 has a [2*1] pore passage structure, and the thermal stability is higher compared with ion implantation of alpha-MnO2 and lambda-MnO2 in crystal pore passages. Through doping theK<+>, Mn-O bonds of the gamma-MnO2 can be reduced, meanwhile, surface flaw sites are increased, and then, the capacity for adsorbing active oxygen and presenting crystal lattice oxygen is enhanced, so that the K<+>-doped gamma-MnO2 catalyst has relatively high catalytic oxidation activity to VOCs and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and specifically relates to a K + doped γ-MnO 2 Catalyst and its preparation method and use. Background technique [0002] Volatile organic compounds (VOCs) are important precursors for the formation of particulate matter and ozone, which can cause atmospheric environmental problems such as haze and photochemical smog. The continuous improvement of environmental quality ultimately depends on the breakthrough and promotion of governance technologies. Therefore, it is of great significance to develop efficient VOCs treatment technology. [0003] Catalytic oxidation method can decompose VOCs into CO at 150-500°C 2 and H 2 O and other small molecular substances, so as to completely eliminate VOCs pollution, suitable for VOCs mixed waste gas that has no recovery value. Traditional noble metal catalysts have been used in the field of VOCs purification for decades, but the high c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/44
CPCB01D53/8687B01D2257/708B01J23/34
Inventor 朱廷钰赵海楠王健徐文青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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