Potassium-doped gamma-manganese dioxide catalyst and preparation method and use thereof

A technology of catalyst and manganese source, which is applied in the field of resources and environment, can solve the problem of no manganese dioxide catalytic activity improvement modification, etc., and achieve the effect of increasing surface defect sites, low preparation cost and simple operation

Active Publication Date: 2019-01-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • 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 th

Method used

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  • Potassium-doped gamma-manganese dioxide catalyst and preparation method and use thereof
  • Potassium-doped gamma-manganese dioxide catalyst and preparation method and use thereof
  • Potassium-doped gamma-manganese dioxide catalyst and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] Example 1

[0049] Kind of K + Doped γ-MnO 2 The preparation method of the catalyst specifically includes the following steps:

[0050] (1) Mn(NO 3 ) 2 Dissolved in water, formulated as Mn 2+ The concentration of 0.2mol / L manganese solution, under stirring, to Mn(NO 3 ) 2 Add NH dropwise to the solution 4 HCO 3 Solution, the mixture is filtered, washed, dried and calcined in the air at 400℃ for 4h to obtain γ-MnO 2 ;

[0051] Where the NH 4 HCO 3 With Mn in manganese solution 2+ The molar ratio of is 8:1;

[0052] (2) To KNO 3 Add γ-MnO to the solution 2 , After standing, washing and drying, calcining in 400℃ air atmosphere for 4h to obtain K + Doped γ-MnO 2 catalyst;

[0053] Where the KNO 3 And γ-MnO 2 The molar ratio is 0.5:10.

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

[0055] For the K prepared in this example + Doped γ-MnO 2 The performance of the catalyst was evaluated, and the results obtained are sho...

Example Embodiment

[0056] Example 2

[0057] Kind of K + Doped γ-MnO 2 Preparation method of catalyst, except KNO 3 And γ-MnO 2 Except for the molar ratio of 0.1:10, the rest is the same as in Example 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.

Example Embodiment

[0059] Example 3

[0060] Kind of K + Doped γ-MnO 2 Preparation method of catalyst, except KNO 3 And γ-MnO 2 Except for the molar ratio of 0.25:10, the rest is the same as in Example 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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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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