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A kind of magnesium cobaltate catalyst and its preparation method and application

A technology of magnesium cobaltate and catalyst, which is applied in the field of catalyst preparation and can solve problems not related to the application of preparation methods

Active Publication Date: 2020-10-23
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Xu Xiufeng et al. (J.Fuel Chem.Tech.,2016,44,1494-1501) also studied the catalytic decomposition of N by Mg-Co composite oxide catalyst. 2 O, but neither involved the preparation of magnesium cobaltate (a Mg-Co composite oxide) catalyst with cavity morphology formed by porous worm-like nanoparticles and its application in the decomposition of high-concentration nitrous oxide exhaust gas

Method used

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  • A kind of magnesium cobaltate catalyst and its preparation method and application
  • A kind of magnesium cobaltate catalyst and its preparation method and application
  • A kind of magnesium cobaltate catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Weigh 8 grams of glucose and dissolve it in 45 milliliters of deionized water to form a solution, transfer it to a self-pressurized reactor equipped with a polytetrafluoroethylene liner, raise the temperature to 180 °C at a rate of 10 °C / min, and crystallize for 6 Hour. A tan precipitate was obtained, which was washed alternately with ethanol and deionized water. Move it into an oven and dry at 80°C for 12 hours to obtain carbon spheres. The above is the process of hydrothermally synthesizing carbon spheres using glucose as a raw material, and the conditions and methods for synthesizing carbon spheres in the following examples are the same as this example.

[0034] Weigh 0.611 g of Co(NO 3 ) 2 ·6H 2 O, 0.269 g Mg(NO 3 ) 2 ·6H 2 0, 0.757 gram of urea (urea molecule / cobalt-magnesium atom=4, mol ratio), be dissolved in 45 milliliters of deionized water, add in 1 gram of carbon spheres (cobalt-magnesium atom / carbon sphere=0.149, mass ratio), stir, Sonicate for 10 mi...

Embodiment 2

[0037] Weigh 0.786 g of Co(NO 3 ) 2 ·6H 2 O, 0.346 g Mg(NO 3 ) 2 ·6H 2 0, 0.973 gram of urea (urea molecule / cobalt-magnesium atom=4, mol ratio), be dissolved in 45 milliliters of deionized water, add in 1 gram of carbon spheres (cobalt-magnesium atom / carbon sphere=0.192, mass ratio), stir, Sonicate for 10 minutes, transfer to a self-pressurized reactor equipped with a polytetrafluoroethylene liner, seal it, raise the temperature to 120°C at a rate of 10°C / min, rotate and crystallize for 4 hours, and wash the product several times with deionized water , dried at 80°C for 12 hours. In the air, the temperature was raised to 500° C. at a rate of 5° C. / minute, and the above product was roasted at a constant temperature for 4 hours to prepare a magnesium cobaltate catalyst. For catalytic decomposition of N 2 O, N 2 See the appendix for the decomposition percentage data of O figure 2 .

Embodiment 3

[0039] Weigh 0.960 g of Co(NO 3 ) 2 ·6H 2 O, 0.423 g Mg(NO 3 ) 2 ·6H 2 0, 1.189 grams of urea (urea molecule / cobalt-magnesium atom=4, mol ratio), be dissolved in 45 milliliters of deionized water, add in 1 gram of carbon spheres (cobalt-magnesium atom / carbon sphere=0.235, mass ratio), stir, Sonicate for 10 minutes, transfer to a self-pressurized reactor equipped with a polytetrafluoroethylene liner, seal it, raise the temperature to 120°C at a rate of 10°C / min, rotate and crystallize for 4 hours, and wash the product several times with deionized water , dried at 80°C for 12 hours. In the air, the temperature was raised to 500° C. at a rate of 5° C. / minute, and the above product was roasted at a constant temperature for 4 hours to prepare a magnesium cobaltate catalyst. For catalytic decomposition of N 2 O, N 2 See the appendix for the decomposition percentage data of O image 3 .

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Abstract

The invention relates to a magnesium cobaltate catalyst and its preparation method and use. The carbon spheres are first hydrothermally synthesized, and then the surface of the carbon spheres is impregnated with a mixed aqueous solution of cobalt nitrate, magnesium nitrate and urea. Then, it was rotated and crystallized for 4 hours in an autoclave equipped with a polytetrafluoroethylene liner, and cobalt-magnesium composite hydroxide was hydrothermally synthesized on the surface of the carbon sphere. Then, the carbon balls are calcined in air to obtain the magnesium cobaltate catalyst. The catalyst prepared by the invention has a cavity morphology formed by porous worm-shaped nanoparticles, that is, the porous worm-shaped nanoparticles surround each cavity. This catalyst is used to catalyze the decomposition of high concentrations of nitrous oxide (N 2 O) Exhaust gas, which significantly increases the internal and external diffusion rate of reactants, thus improving the catalyst activity.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a method for preparing a magnesium cobaltate catalyst with cavity morphology formed by porous worm-like nanoparticles, and the prepared magnesium cobaltate catalyst decomposes in high-concentration nitrous oxide exhaust gas React application. Background technique [0002] With the development of industry, a large amount of greenhouse gases have been emitted artificially, which has caused the ground temperature to rise year by year, which has attracted widespread attention from all over the world. In December 1997, at the third meeting of the parties to the "United Nations Framework Convention on Climate Change" held in Japan, it adopted major measures to limit carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride. The Kyoto Protocol on Greenhouse Gas Emissions. In February 2005, the "Kyoto Protocol" came into force. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J35/10B82Y40/00B01D53/86B01D53/56
CPCB01D53/8628B82Y40/00B01J23/78B01D2257/402B01J35/60Y02C20/10
Inventor 徐秀峰郑丽李和健
Owner YANTAI UNIV
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