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A metal-doped modified layered δ-mno 2 and its preparation and application

A metal doping and modification layer technology, which is applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve VOCs emissions, environmental pollution, high volatility, etc. problems, to achieve the effects of cheap and easy-to-obtain raw materials, long service life, and strong resistance to chlorine poisoning

Active Publication Date: 2021-06-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most VOCs emit a lot, are harmful, long-lasting, highly volatile, and have good chemical and thermal stability, are not easy to be decomposed or biodegraded, and can stay in nature for a long time, causing persistent pollution to the environment. It has "three causes" (teratogenic, carcinogenic, mutagenic) effects and poses a serious threat to human and biological health

Method used

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  • A metal-doped modified layered δ-mno <sub>2</sub> and its preparation and application
  • A metal-doped modified layered δ-mno <sub>2</sub> and its preparation and application
  • A metal-doped modified layered δ-mno <sub>2</sub> and its preparation and application

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preparation example Construction

[0047] Another object of the present invention is to provide a metal-doped modified layered δ-MnO 2 The preparation method comprises the following steps:

[0048] Step 1: feed;

[0049] Step 2: react under the set reaction conditions;

[0050] Step 3: post-processing the system obtained in step 2 to obtain the final product.

[0051] Metal-doped modified layered δ-MnO in the present invention 2 The preparation method is the hydrothermal method. Compared with other powder preparation methods such as sol-gel method and high-temperature solid-phase method, the powder prepared by hydrothermal method has complete grain development, small particle size, uniform distribution, light particle agglomeration, and cheaper raw materials can be used , easy to obtain suitable stoichiometry and crystal form.

[0052] Step 1, feed;

[0053] In step 1, the addition is adding a manganese-containing compound, wherein the manganese-containing compound is potassium manganate, potassium perman...

Embodiment 1

[0104] Add 70ml deionized water to the hydrothermal kettle, then add 1.58g KMnO 4 , 1.87g Al(NO 3 ) 3 ·H 2 O was added to the hydrothermal kettle, and stirred in deionized water for 30min, then 2ml of ammoniacal liquor of 0.15mol / L was added;

[0105] Then react the added raw materials in a hydrothermal kettle at 160°C for 12 hours, and the reaction ends;

[0106] Filter the solid-liquid mixture of the reaction liquid in the hydrothermal kettle, and wash the filter cake with deionized water until the pH value of the filtrate is 7 to obtain the filter cake; then dry the filter cake at 80°C for 12 hours to obtain the metal-doped modified layered δ-MnO 2 .

Embodiment 2

[0108] Add 70ml deionized water to the hydrothermal kettle, then add 1.58g KMnO 4 , 1.87g Al(NO 3 ) 3 ·H 2 O was added to the hydrothermal kettle, and stirred in deionized water for 30min, then 2ml of citric acid of 0.15mol / L was added;

[0109] Then react the added raw materials in a hydrothermal kettle at 160°C for 12 hours, and the reaction ends;

[0110] Filter the solid-liquid mixture of the reaction liquid in the hydrothermal kettle, and wash the filter cake with deionized water until the pH value of the filtrate is 7 to obtain the filter cake; then dry the filter cake at 80°C for 12 hours to obtain the metal-doped modified layered δ-MnO 2 .

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Abstract

The invention relates to a metal-doped modified layered δ-MnO 2 Its preparation and application, by adding a sedimentation aid, the metal-doped layered δ-MnO is prepared by a hydrothermal method 2 , whose specific surface area increases as undoped layered δ‑MnO 2 5 times of , the pores are denser, so that the metal-doped layered δ-MnO of the present invention 2 It has high catalytic oxidation activity and high chlorine resistance, and has efficient catalytic degradation performance for refractory volatile organic compounds in organic waste gas. The preparation method provided by the invention is simple and has industrial application value.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a metal-doped modified layered compound with high catalytic degradation performance and anti-poisoning ability for volatile organic waste gas, especially for highly toxic and refractory chlorine-containing volatile organic compounds. δ-MnO 2 and its preparation method. Background technique [0002] Today, with the rapid development of industry and economy, the problem of environmental pollution has become increasingly prominent, which has begun to endanger human health and has attracted worldwide attention. With the improvement of human awareness of environmental protection, countries around the world have taken measures and formulated relevant laws to control the discharge of pollution sources and strengthen pollution control. Industrial waste gas (volatile organic compounds, etc.) and vehicle exhaust (carbon monoxide, hydrocarbons, and nitrogen oxides, etc.) are the main ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J35/10B01D53/86B01D53/44B01D53/70
CPCB01J23/34B01D53/8687B01D53/8662B01J35/617B01J35/635B01J35/615
Inventor 张婷婷陈远庭胡立扬罗邯予
Owner BEIJING UNIV OF CHEM TECH
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