Preparation of bimetallic oxides by redox-hydrolysis coupling reaction for low-temperature catalytic combustion of vocs

A bimetallic oxide, low-temperature catalysis technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc. sufficient, waste water and slag, etc., to achieve the effect of favorable adsorption, large specific surface area, and high catalytic activity

Active Publication Date: 2020-07-10
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, single metal oxides are prone to sintering during the reaction process, resulting in a shortened service life of the catalyst, so it is often necessary to increase the service life of non-noble metal catalysts by introducing a second metal
[0004] At present, the synthesis methods of Mn-X bimetallic oxides mainly include coprecipitation method and impregnation method. These methods face problems such as insufficient bimetallic mixing, long reaction cycle, and more wastewater and waste residues.

Method used

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  • Preparation of bimetallic oxides by redox-hydrolysis coupling reaction for low-temperature catalytic combustion of vocs
  • Preparation of bimetallic oxides by redox-hydrolysis coupling reaction for low-temperature catalytic combustion of vocs
  • Preparation of bimetallic oxides by redox-hydrolysis coupling reaction for low-temperature catalytic combustion of vocs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 6 g of KMnO 4 and 5.1 g Fe(NO 3 ) 3 9H 2 O was dissolved in 200-300 mL of deionized water to form a deep purple aqueous solution 1, in which the molar ratio of Mn and Fe was 3:1;

[0033] (2) 19.35mL of analytically pure (30%) H 2 o 2 Dilute with 200-300 mL deionized water to obtain solution 2;

[0034] (3) At room temperature with rapid stirring, solution 2 was added dropwise to solution 1, and a large amount of precipitate was formed during the reaction, accompanied by a large amount of O 2 generate;

[0035] (4) Leave the precipitate to age overnight, filter and wash with water for 3-5 times;

[0036] (5) at 110 o C drying overnight, roasting in air to 400 o C and kept for 2 h, the 3Mn1Fe double metal oxide catalyst with a Mn / Fe molar ratio of 3:1 can be obtained;

[0037] (6) Characterized by scanning electron microscopy, the 3Mn1Fe synthesized in Example 1 is amorphous nanoparticles on the microscopic scale, see figure 2 ; Characterized by trans...

Embodiment 2

[0040] (1) Add 6 g of KMnO 4 , 3.1 g of Fe(NO 3 ) 3 9H 2 O and 1.48 g of concentrated nitric acid were dissolved in 200-300 mL of deionized water to form a deep purple aqueous solution 1, wherein the molar ratio of Mn and Fe was 5:1;

[0041] (2) 19.35 mL of analytically pure (30%) H 2 o 2 Dilute with 200-300 mL deionized water to obtain solution 2;

[0042] (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;

[0043] (4) Leave the precipitate to age overnight, filter and wash with water for 3-5 times;

[0044] (5) at 110 o C drying overnight, roasting in air to 400 o C and keep it for 2 h, you can get 5Mn1Fe double metal oxide;

[0045] (6) Characterized by scanning electron microscopy, the 5Mn1Fe double metal oxide synthesized in Example 2 is amorphous nanoparticles on the microscopic scale, see Figure 4 ; characterized by XRD as amorphous str...

Embodiment 3

[0048] (1) Add 6 g of KMnO 4 and 5.52 g of Co(NO 3 ) 2 ·6H 2 O was dissolved in 200-300 mL of deionized water to form a deep purple aqueous solution 1, in which the molar ratio of Mn and Co was 2:1;

[0049] (2) 19.35 mL of analytically pure (30%) H 2 o 2 Dilute with 200-300 mL deionized water to obtain solution 2;

[0050] (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;

[0051] (4) Leave the precipitate to age overnight, filter and wash with water for 3-5 times;

[0052] (5) at 110 o C drying overnight, roasting in air to 400 o C and keep it for 2 h, you can get 2Mn1Co double metal oxide;

[0053] (6) Characterized by XRD, the catalyst is an amorphous oxide;

[0054] (7) In a fixed-bed reactor, evaluate the catalytic combustion performance of high-concentration toluene. The catalyst dosage is 0.2 g. The catalyst is 40-60 mesh solid particle...

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Abstract

The invention relates to a new synthesis method of a Mn-X (X is Fe, Co, Al and the like) bimetallic oxide catalyst, and applications of the Mn-X (X is Fe, Co, Al and the like) bimetallic metal oxide catalyst in low-temperature catalytic combustion of volatile organic compounds (VOCs). The new synthesis method comprises: dissolving KMnO4 and a metal strong-acid salt (such as Fe(NO3)3.9H2O, Co(NO3)2, and the like) in a certain volume of deionized water to form a solution 1; diluting 3 times the theoretical equivalent of H2O2 by using deionized water to form a solution 2; at a room temperature, adding the solution 2 to the solution 1 in a dropwise manner, wherein a large amount of gas is generated during the reaction; and aging the generated precipitate overnight, filtering, washing, drying,and carrying out high-temperature calcination to obtain the required Mn-X bimetallic catalyst. According to the present invention, the method is simple and rapid, and can avoid the problems of incomplete precipitation, non-uniform mixing of two metals, and the like of the traditional co-precipitation method; the synthesized metal oxide has advantages of large specific surface area, small nanoparticle size and the like, can easily achieve the catalytic combustion reaction of VOCs on the surface; and the Mn-X bimetallic catalyst achieves the ideal catalytic effect in the low-temperature catalytic combustion reaction of toluene.

Description

technical field [0001] The invention relates to a new method for synthesizing Mn-X double 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 economy and the improvement of people's living standards, the problem of environmental pollution has attracted more and more attention. Industrial "three wastes" are an important source of environmental pollution. Among them, the waste gas has the characteristics of strong dispersion, wide pollution range, and difficulty in recycling and centralized treatment. It is the focus of industrial pollution prevention and control. Volatile organic compounds (VOCs) account for a considerable proportion of exhaust gas pollution, mainly from petrochemical, printing, coating and other industries, and their types include aliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J23/34
CPCB01J23/34B01J23/8892B01J35/023B01J35/026B01J35/1019B01J37/033B01J37/08B01J37/12
Inventor 贾宏鹏陈金许珍
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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