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Preparation of Mn-base metal oxide catalyst through H2O2 quick reduction method and application of Mn-base metal oxide catalyst to volatile organic chemicals (VOCs) low-temperature catalytic combustion

A low-temperature catalysis, H2O2 technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst activation/preparation, etc., can solve high hydrothermal temperature, waste water and residue, long reaction cycle etc. to achieve high catalytic activity, good adsorption, and large specific surface area

Active Publication Date: 2016-09-07
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are faced with the problems of long reaction cycle, high hydrothermal temperature, and more waste water residues.

Method used

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  • Preparation of Mn-base metal oxide catalyst through H2O2 quick reduction method and application of Mn-base metal oxide catalyst to volatile organic chemicals (VOCs) low-temperature catalytic combustion
  • Preparation of Mn-base metal oxide catalyst through H2O2 quick reduction method and application of Mn-base metal oxide catalyst to volatile organic chemicals (VOCs) low-temperature catalytic combustion
  • Preparation of Mn-base metal oxide catalyst through H2O2 quick reduction method and application of Mn-base metal oxide catalyst to volatile organic chemicals (VOCs) low-temperature catalytic combustion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 2 g of KMnO 4 and 0.8 g of 98% H 2 SO 4 Dissolved in 100 mL of deionized water to form a deep purple aqueous solution 1, in which KMnO 4 The concentration is about 0.02 g / mL;

[0029] (2) Mix 2 mL of analytically pure (30%) H 2 o 2 Dilute to solution 2 with 100 mL deionized water;

[0030] (3) At room temperature with rapid stirring, solution 2 was added dropwise to solution 1 to form a large amount of precipitate accompanied by a large amount of O 2 generate;

[0031] (4) Leave the precipitate to age overnight, filter and wash with water for 3-5 times;

[0032] (5) at 110 o C drying overnight, roasting in air to 400 o C and keep for 2 h, you can get MnO x catalyst powder;

[0033] (6) Characterized by scanning electron microscopy, the MnO synthesized in Example 1 x Amorphous solid particles on the microscopic scale, see figure 2 ;Characterized as α-MnO by XRD 2 ; via N 2 Static adsorption and desorption characterization, and the BET method was u...

Embodiment 2

[0036] (1) Add 3 g of KMnO 4 and 0.8 g of 98% H 2 SO 4 Dissolved in 100 mL of deionized water to form a deep purple aqueous solution 1, in which KMnO 4 The concentration is about 0.03 g / mL;

[0037] (2) Mix 8 mL of analytically pure (30%) H 2 o 2 Dilute to solution 2 with 100 mL deionized water;

[0038](3) At room temperature with rapid stirring, solution 2 was added dropwise to solution 1 to form a large amount of precipitate accompanied by a large amount of O 2 generate;

[0039] (4) Leave the precipitate to age overnight, filter and wash with water for 3-5 times;

[0040] (5) at 110 o C drying overnight, roasting in air to 400 o C and keep for 2 h, you can get MnO x catalyst powder;

[0041] (6) Characterized by scanning electron microscopy, the MnO synthesized in Example 2 x Hierarchical structures formed for rod-like and granular packing on the microscopic scale, see image 3 ; Characterized as amorphous MnO by XRD 2 ; via N 2 Characterized by static adsor...

Embodiment 3

[0046] (1) Add 3 g of KMnO 4 and 0.5 g of 95% H 3 PO 4 Dissolved in 100 mL of deionized water to form a deep purple aqueous solution 1, in which KMnO 4 The concentration is about 0.02 g / mL;

[0047] (2) Mix 8 mL of analytically pure (30%) H 2 o 2 Dilute to solution 2 with 100 mL deionized water;

[0048] (3) At room temperature with rapid stirring, solution 2 was added dropwise to solution 1 to form a large amount of precipitate accompanied by a large amount of O 2 generate;

[0049] (4) Leave the precipitate to age overnight, filter and wash with water for 3-5 times;

[0050] (5) at 110 o C drying overnight, roasting in air to 400 o C and keep for 2 h, you can get MnO x catalyst powder;

[0051] (6) The catalyst is characterized by XRD as amorphous MnO 2 ;

[0052] (7) In the fixed-bed reactor, evaluate the catalytic combustion performance of high-concentration toluene, the catalyst dosage is 0.2 g, and the catalyst is 40-60 mesh solid particles after sieving, th...

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Abstract

The invention discloses a novel preparation method of a Mn-base metal oxide (MnOx) catalyst and application of the MnOx catalyst to the field of volatile organic chemicals (VOCs) low-temperature catalytic combustion. The method comprises the steps that KMnO4 and inorganic liquid acid are dissolved to a certain volume of deionized water to form a solution 1; a certain amount of H2O2 is diluted by deionized water to form a solution 2; on the room temperature condition, the solution 2 is added into the solution 1 dropwise; generated sediment is filtered, washed, dried and roasted at the high temperature after being aged and passing the night, and then the needed MnOx catalyst can be obtained. The method has the advantages that simpleness and quickness are achieved; the problems that the synthetic temperature is high, time is long and the amount of waste water and the number of waste residues are large in a hydrothermal synthesis method and a direct precipitation method can be avoided; a MnOx material of a multilevel structure can be synthesized, and the large comparison area is beneficial for a VOCs catalytic combustion reaction on the surface of the MnOx catalyst. In methylbenzene and methanol low-temperature combustion, the synthesized MnOx has an ideal catalyzing effect.

Description

technical field [0001] The invention relates to a new method for synthesizing Mn-based metal oxides suitable for low-temperature catalytic combustion of VOCs, and belongs to the technical field of chemical catalysts and their preparation. Background technique [0002] With the development of the national economy and the improvement of people's living standards, how to reduce the pollution of human production and activities to the environment is a common concern. Among the industrial "three wastes", waste gas has the characteristics of strong dispersion, wide pollution range, and difficulty in recycling and centralized treatment. Therefore, the purification of industrial waste gas is a key area of ​​pollution prevention and control. In industrial waste gas, volatile organic compounds (VOCs) account for a considerable proportion of waste gas pollution, mainly from petrochemical, printing, shoemaking, painting and other industries, including aliphatic hydrocarbons, aromatic hyd...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J37/16F23G7/07
CPCB01J23/34B01J37/16F23G7/07
Inventor 贾宏鹏陈金许珍
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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