Preparation method of non-noble metal modified manganese oxide molecular sieve catalyst for catalytic combustion of toluene

A non-precious metal, catalytic combustion technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, combustion method, physical/chemical process catalyst, etc., can solve the problems of low ignition temperature, easy failure, high cost, etc., to achieve Good thermal stability, conducive to popularization and application, and the effect of reducing preparation costs

Inactive Publication Date: 2019-03-29
JIANGHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Since the 21st century, the catalytic oxidation process of VOCs based on metal oxides has been extensively studied. Among them, noble metal oxides have a low ignition temperature, a small difference between the complete combustion temperature and the ignition temperature, a long service life, and a wide range of applications. The advantages of easy recycling have attracted widespread attention, but the cost is high, and it is prone to failure when dealing with VOCs gases containing heteroatoms and extreme reaction temperatures
However, the existing VOCs catalytic materials, especially toluene combustion catalysts, often have the problems of high preparation cost and insignificant reduction in the temperature of toluene oxidation reaction.

Method used

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  • Preparation method of non-noble metal modified manganese oxide molecular sieve catalyst for catalytic combustion of toluene
  • Preparation method of non-noble metal modified manganese oxide molecular sieve catalyst for catalytic combustion of toluene
  • Preparation method of non-noble metal modified manganese oxide molecular sieve catalyst for catalytic combustion of toluene

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preparation example Construction

[0016] The first aspect of the present invention provides a method for preparing a non-noble metal modified manganese oxide molecular sieve catalyst that catalyzes combustion of toluene, the steps comprising:

[0017] S1. Weigh MnSO 4 ·H 2 O was dissolved in deionized water and HNO was added 3 get MnSO 4 ·H 2 O and HNO 3 mixed solution;

[0018] S2, the KMnO 4 Add to deionized water, stir to get KMnO 4 solution; the KMnO 4 The solution was added dropwise to the MnSO4 described in step S1 4 ·H 2 O and HNO 3 In the mixed solution, stir and reflux at 90-120°C for 22-26h. After the reaction, the solid obtained is washed, purified and dried with deionized water to obtain a dry solid product. It should be noted that the completely dissolved KMnO 4 The solution is dripped into the mixed solution prepared in step S1. This dripping sequence and the subsequent reflux process are the most critical steps of the present invention, which directly affect the formation of the mang...

Embodiment 1

[0033] This embodiment provides a method for preparing a non-noble metal modified manganese oxide molecular sieve catalyst that catalyzes combustion of toluene, the steps comprising:

[0034] Weigh 5.8g KMnO 4 Put it into a 250mL dry and clean beaker, add 80mL deionized water, and stir for 1 hour to obtain solution A. Weigh 8.8g MnSO 4 ·H 2 O, put it into a 250mL dry and clean Erlenmeyer flask, add 30mL deionized water, stir to make it fully dissolve, measure 3mLHNO 3 (analytical pure) add MnSO 4 solution to obtain solution B. Add the aforementioned A solution to the B solution drop by drop. The obtained mixed solution was placed in a 105° C. oil bath, stirred and refluxed for 25 hours. The solid product obtained by the reflux reaction was washed and purified with a sufficient amount of deionized water in a centrifuge at 4000 rpm, and centrifuged for 7 minutes each time, 7 times in total. The purified solid product was transferred into a dry and clean beaker, put into a...

Embodiment 2

[0041] This embodiment provides a method for preparing a non-noble metal modified manganese oxide molecular sieve catalyst that catalyzes combustion of toluene, the steps comprising:

[0042] Weigh 11.6g KMnO 4 Put it into a 500mL dry and clean beaker, add 160mL deionized water, and stir for 1 hour to obtain solution A. Weigh 17.6g MnSO 4 ·H 2 O, put it into a 500mL dry and clean Erlenmeyer flask, add 60mL deionized water, stir to make it fully dissolve, measure 6mLHNO 3 (analytical pure) into MnSO 4 solution to obtain solution B. Add the aforementioned A solution to the B solution drop by drop. The obtained mixed solution was placed in an oil bath at 102° C., stirred and refluxed for 26 hours. The solid product obtained by the reflux reaction was washed and purified 5 times in a centrifuge at 5000 rpm with sufficient deionized water. The purified solid product was transferred into a dry and clean beaker, put into a drying oven and dried at a temperature of 110° C. for ...

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Abstract

The invention provides a preparation method of a non-noble metal modified manganese oxide molecular sieve catalyst for catalytic combustion of toluene. The steps include: adding a KMnO4 solution dropwise into a mixed solution of MnSO4.H2O and HNO3, carrying out stirring reflux reaction, then performing mixing with Ce(NO3)2.6H2O, and conducting drying and calcination, thus obtaining the Ce modifiedmanganese oxide molecular sieve catalyst. Compared with noble metal catalysts, the Ce modified manganese oxide molecular sieve catalyst provided by the invention can effectively reduce the preparation cost, lower the temperature of toluene combustion reaction and achieve the purpose of energy saving, and has simple preparation process, thus having good application prospects.

Description

technical field [0001] The invention belongs to the technical field of preparation of VOCs catalytic materials, and in particular relates to a preparation method of a non-precious metal modified manganese oxide molecular sieve catalyst for catalytic combustion of toluene. Background technique [0002] Volatile organic pollutants (VOCs) emitted from industrial production and automobile exhaust are harmful to the atmospheric environment and human health. There are many kinds of VOCs control methods, common ones are: adsorption, absorption, pyrolysis, catalytic combustion, photocatalytic degradation, etc. Among them, the catalytic combustion method is selected as one of the main control methods for VOCs due to its lower operating temperature and higher conversion efficiency. In order to improve the economic benefits and industrial application stability of the VOCs catalytic combustion method, the research and development of various catalytic materials is becoming a research ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34F23G7/07B01D53/86B01D53/44B01D53/72
CPCB01D53/8668B01D53/8687B01D2255/2065B01D2255/2073B01D2257/7027B01D2257/708B01J23/34F23G7/07F23G2209/14
Inventor 岳琳余国贤胡明华徐志花
Owner JIANGHAN UNIVERSITY
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