Novel preparation method of spinel type composite oxide MnCo2O4

A composite oxide and spinel-type technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high gelation temperature and long time , to achieve the effect of low roasting temperature, high combustion heat and lower roasting temperature

Pending Publication Date: 2021-05-04
SHENGLI COLLEGE CHINA UNIV OF PETROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the disadvantages of high gelation temperature and long time for the preparation of spinel oxide by the traditional sol-gel method, by adding glucose, changing the reaction conditions, and promoting its gelation, the preparation of MnCo 2 o 4 Spinel-type composite oxide catalyst to achieve the purpose of reducing the combustion temperature of soot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation of MnCo mentioned in the present invention 2 o 4 The spontaneous combustion method of the spinel type composite oxide catalyst is as follows:

[0023] First, weigh 4.9 g of manganese acetate tetrahydrate and place it in a mortar, and grind for 5 minutes; then weigh 11.64 g of cobalt nitrate hexahydrate, and grind for 5 minutes; mix the two substances and continue grinding for 5 minutes. Weigh 6.48g of glucose according to a certain proportion and grind it for 5 minutes; mix the ground glucose and metal salt and continue grinding for 25 minutes to obtain a pink viscous compound intermediate; then put it in an oven at 160°C for 12 hours, and burn it to get gray fluffy powder The final sample precursor is roasted in a muffle furnace under the following conditions: in air at a rate of 5 °C / min from room temperature to 500 °C, constant temperature for 4 hours, and naturally lowered to room temperature to obtain MnCo 2 o 4 spinel composite oxide.

[0024] ...

Embodiment 2

[0027] The preparation of MnCo mentioned in the present invention 2 o 4 The spontaneous combustion method of the spinel type composite oxide catalyst is as follows:

[0028] Firstly, weigh 4.9 g of manganese acetate tetrahydrate and place it in a mortar, and grind for 10 minutes; then weigh 11.64 g of cobalt nitrate hexahydrate, and grind for 10 minutes; mix the two substances and continue grinding for 5 minutes. Weigh 8.64g of glucose according to a certain proportion and grind it for 5 minutes; mix the ground glucose and metal salt and continue grinding for 25 minutes to obtain a pink viscous compound intermediate; then put it in an oven at 180°C for 24 hours, and burn it to get gray fluffy powder The final sample precursor is roasted in a muffle furnace under the following conditions: in air at a rate of 5 °C / min from room temperature to 500 °C, constant temperature for 6 hours, and naturally lowered to room temperature to obtain MnCo 2 o 4 spinel composite oxide.

[00...

Embodiment 3

[0032] The preparation of MnCo mentioned in the present invention 2 o 4 The spontaneous combustion method of the spinel type composite oxide catalyst is as follows:

[0033]First, weigh 5.6g of manganese acetate tetrahydrate and place it in a mortar, and grind for 5 minutes; then weigh 12.81g of cobalt nitrate hexahydrate, and grind for 5 minutes; mix the two substances and continue grinding for 5 minutes. Weigh 7.68g of glucose according to a certain proportion and grind it for 5 minutes; mix the ground glucose and metal salt and continue grinding for 25 minutes to obtain a pink viscous compound intermediate; then put it in an oven at 160°C for 18 hours, and burn it to get gray fluffy powder The final sample precursor is roasted in a muffle furnace under the following conditions: in air at a rate of 5 °C / min from room temperature to 500 °C, constant temperature for 4 hours, and naturally lowered to room temperature to obtain MnCo 2 o 4 spinel composite oxide.

[0034] Eva...

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Abstract

The invention discloses a novel preparation method of spinel type composite oxide MnCo2O4. The novel preparation method specifically comprises the following operation steps: S1, grinding raw materials; S2, mixing and grinding the raw materials; S3, preparing a combustion improver; S4, mixing the combustion improver; S5, heating in a drying oven; S6, performing solid-phase forming on a semi-finished product; and S7, performing an evaluation experiment. Compared with other methods, the method has the advantages that glucose is used as fuel, and a large amount of heat released by combustion is beneficial to reducing the roasting temperature and avoiding sintering, so that the activity of the catalyst is improved; according to the spontaneous combustion method disclosed by the invention, relatively cheap glucose is adopted as fuel and is rarely reported at present; and compared with other fuels such as glycine and urea, the combustion heat is large, the reaction is facilitated, the roasting temperature is low, the product particle size is small, and the activity of the synthesized MnCo2O4 spinel type composite oxide catalyst is high.

Description

technical field [0001] The invention belongs to the technical field of diesel vehicle exhaust gas treatment catalysts, in particular to a spinel composite oxide MnCo 2 o 4 new preparation method. Background technique [0002] With the continuous improvement of living standards, the number of automobiles is also increasing rapidly, and the problem of automobile exhaust pollution is increasing day by day. Diesel vehicles have become the "darling" of many enthusiasts today because of their good fuel economy, high ignition point, not easy to be ignited or exploded due to accidental circumstances, and safer and more stable to use. However, the soot particulate matter (PM) contained in the exhaust of diesel vehicles is as high as 50 times that of gasoline engines, which is one of the main sources of smog and is extremely harmful to human health. In response to the problem of diesel vehicle exhaust pollution, countries around the world have formulated strict vehicle exhaust emis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889F01N3/28
CPCB01J23/005B01J23/8892F01N3/2803
Inventor 刘焕荣张含陈玉凤杨森张艳艳王子怡
Owner SHENGLI COLLEGE CHINA UNIV OF PETROLEUM
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