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Nano spinel type catalyst and preparation method thereof

A nano-spinel and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, combustion methods, etc., can solve the problems of poor control of precipitation end point, large catalyst particle size, affecting catalytic combustion activity, etc. Short test period, low cost, and the effect of reducing production costs

Inactive Publication Date: 2017-05-10
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of the catalyst prepared by this method are: the end point of precipitation is not easy to control; a large amount of useful components will be taken away during washing, and impurities will be introduced; the addition of precipitant may easily make the local concentration too high, local precipitation occurs, and the precipitation is uneven. , affecting the precipitation effect
Moreover, the catalyst prepared by the solid-state reaction method is easy to accumulate, and the particle size of the catalyst is relatively large, which will seriously affect its catalytic combustion activity.

Method used

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  • Nano spinel type catalyst and preparation method thereof
  • Nano spinel type catalyst and preparation method thereof
  • Nano spinel type catalyst and preparation method thereof

Examples

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preparation example Construction

[0037] The embodiment of one aspect of the present invention provides a kind of preparation method of nano spinel type catalyst, comprises the following steps:

[0038] S1: Dissolving the A-position divalent metal nitrate in deionized water and stirring to obtain the A-position divalent metal nitrate solution;

[0039] S2: Dissolve the B-site trivalent metal nitrate in deionized water, and stir to obtain the B-site trivalent metal nitrate solution; slowly add the B-site trivalent metal nitrate solution to the A-site metal nitrate solution, and continue stirring Make it fully mixed to form a mixed solution of A-site and B-site metal nitrates;

[0040] In this step, the A-position divalent metal nitrate solution and the B-position trivalent metal nitrate solution are two kinds of solutions that do not react with each other. In order to make the two form a uniform mixed solution, when adding, it is necessary to add slowly, In order to avoid affecting each other during the additi...

Embodiment 1

[0057] (1) 18.21g (0.075mol) Cu(NO 3 ) 2 ·3H 2 O was dissolved in 20ml deionized water, and stirred to obtain A solution; (2) 60.6g (0.15mol) Fe(NO 3 ) 3 9H 2 O was dissolved in 50ml of deionized water, and stirred to obtain solution B; solution B was slowly added to solution A, and kept stirring to make it fully mixed to form a mixed solution of A+B; (3) 47.28g (0.225mol) of citric acid monohydrate (C 6 h 8 o 7 ·H 2 O) be dissolved in 30ml deionized water, stir to obtain a citric acid solution; slowly add the citric acid solution to the A+B mixed solution, and keep stirring to make it fully mixed to form a sol precursor solution; (4) adjust the pH value to 7 with ammonia water , and stirred at 70°C for 5 hours, the solution was in a sol state; the sol was aged for 2 hours to form a gel, and the gel was air-dried at 130°C for 12 hours to form a xerogel; (5) Grind the xerogel into powder , placed in a porcelain element dish, ignited with a wooden stick on the surface o...

Embodiment 2

[0067] (1) 21.8g (0.075mol) Co(NO 3 ) 2 ·6H 2 O was dissolved in 20ml of deionized water, and stirred to obtain A solution; the remaining steps (2)-(6) were the same as in Example 1 to prepare a powdered nano-spinel catalyst.

[0068] The prepared nano spinel type catalyst catalytic combustion activity evaluation method of embodiment 2 is the same as embodiment 1;

[0069] The characterization and catalytic combustion activity evaluation results of the nano spinel type catalyst prepared by embodiment 2 are as follows:

[0070] As can be seen from the X-ray diffraction (XRD) spectrogram, the prepared nano-spinel catalyst in Example 2 is in the CoFe 2 o 4 (JCPDS22-1086) diffraction peak, when 2θ=18.3°, 30.1°, 30.7°, 35.4°, 37.1°, 43.1°, 53.4°, 56.9°, 62.6°, 74.0°, it corresponds to CoFe 2 o 4 (111), (220), (311), (222), (400), (422), (511), (440), (533) crystal planes of spinel cubic Fd-3m crystal group , indicating that the main component of the catalyst prepared in this...

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Abstract

The invention provides a nano spinel type catalyst and a preparation method thereof, and belongs to the field of volatile organic pollutant treatment and environment protection. By the preparation method, catalytic combustion activity of the nano spinel type catalyst can be improved effectively. The technical scheme includes that a sol precursor solution is obtained by a metal nitrate mixed solution, and xerogel is further obtained; the key point is to ignite the surface of the xerogel, a large quantity of gases are released through self-propagating combustion, fluffy tree-shaped powder is formed through combustion, and the nano spinel type catalyst is obtained finally. The nano spinel type catalyst can be applied to catalytic combustion of volatile organic pollutant gases.

Description

technical field [0001] The invention belongs to the fields of volatile organic pollutant treatment and environmental protection, and in particular relates to a nano spinel catalyst and a preparation method thereof. Background technique [0002] Volatile organic pollutants (Volatile organic compounds, VOCs) are important air pollutants, which are produced in industries such as coal, petroleum, natural gas processing, storage and transportation, chemical industry, machinery, printing and dyeing, paint production, and electronics. It will further react in the atmosphere, forming secondary pollution, seriously polluting the environment and endangering human health. Toluene is a typical representative among them. It can invade the human body through various ways such as ingestion, inhalation, and percutaneous absorption. Its "three effects" of teratogenic, carcinogenic, and mutagenic are extremely harmful to the human body. [0003] There are many VOC treatment methods, the more...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J23/75B01J23/755B01J23/80F23G7/07
CPCF23G7/07B01J23/005B01J23/745B01J23/75B01J23/755B01J23/78B01J23/80F23G2209/14B01J35/40Y02A50/20
Inventor 王永强薛锐陈曦刘敏敏臧萌赵朝成赵东风刘芳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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