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High-activity ozonolysis manganese-based catalyst and preparation method thereof

A manganese-based catalyst, ozone decomposition technology, applied in separation methods, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. problems such as poor state activity, to achieve the effects of broadening applications, simple and convenient preparation methods, and enriching valence states and types

Pending Publication Date: 2021-10-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are studies on the catalytic activity of ozone decomposition in other valence states, the conclusion is still that the activity of other valence states is very poor, especially the activity of trimanganese tetraoxide is very poor
Therefore, no other valence-state Mn-based catalysts have been successfully applied to ozonolysis

Method used

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  • High-activity ozonolysis manganese-based catalyst and preparation method thereof
  • High-activity ozonolysis manganese-based catalyst and preparation method thereof
  • High-activity ozonolysis manganese-based catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] The method that this implementation prepares manganese-based catalyst is as follows:

[0029] (1) Mix manganese sulfate, ammonium persulfate, and deionized water, and stir thoroughly. Wherein the molar ratio of manganese sulfate and ammonium persulfate is 1:1. Under hydrothermal conditions, 90°C was maintained for 6 hours. Filter to remove excess moisture, and dry to obtain solid powder.

[0030] (2) Calcining the solid powder obtained in (1) for 6 hours at 280° C. in a hydrogen (5%) atmosphere.

[0031] (3) Mix the solid obtained by roasting (2) with 2-8% alumina, 20%-80% acetic acid, and water to make a slurry, coat it evenly on cordierite, dry to remove excess water, and obtain a whole Formula manganese-based catalyst 1.

[0032] The manganese oxide that prepares is carried out X-ray diffraction analysis (XRD), the result is as follows figure 1 As shown, the main component of the catalyst is Mn 3 o 4 . h 2 -TPR picture as shown image 3 . pass figure 1 an...

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Abstract

The invention discloses a high-activity ozonolysis manganese-based catalyst and a preparation method thereof. The catalyst is mixed valence state manganese oxide manganous-manganic oxide with a spinel structure. The preparation method comprises the following steps: mixing a divalent manganese source, ammonium persulfate and deionized water, fully stirring, and keeping the obtained mixture for 4-8 hours under the hydrothermal condition of 70-140 DEG C, wherein the molar ratio of the divalent manganese source to the ammonium persulfate is 1: (0.5-2); and drying a solid, obtained by filtering, at 60-110 DEG C for 3-12 hours, and finally roasting at 200-400 DEG C in a reducing atmosphere for 4-8 hours. The ozone decomposition catalyst with efficient catalytic activity under the conditions of high humidity and low ozone concentration is obtained, meanwhile, the valence state and the type of the manganese-based ozone catalyst are enriched, and the application of manganous-manganic oxide is widened.

Description

technical field [0001] The invention belongs to the field of ozone decomposition, in particular to a manganese-based catalyst for decomposing indoor ozone under high humidity conditions and its preparation. Background technique [0002] Near the ground, tap water and wastewater treatment, food factories, disinfection in the pharmaceutical industry, etc. will emit high concentrations of ozone; the use of various household appliances such as disinfection cabinets, printers, etc. can also generate ozone. In addition NO x And VOCs produce ozone through photochemical reaction under sunlight. Due to the strong oxidation of ozone, it will cause damage to the human respiratory system, immune system and nervous system. Long-term exposure to excessive ozone concentrations may cause permanent lung damage and other respiratory diseases. In addition to the harmful effects of ozone itself, the heterogeneous and homogeneous reactions between ozone and unsaturated hydrocarbons will produ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/66
CPCB01J23/005B01J23/34B01D53/8675Y02A50/20
Inventor 赵明邱晶王健礼
Owner SICHUAN UNIV
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