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A medium and low temperature catalytic decomposition n 2 Catalyst and preparation method and application of o

A low-temperature catalysis and catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, separation method, etc. Active oxide sintering and other issues to achieve superior low-temperature catalytic activity, maintain continuous adsorption and desorption, and stable configuration characteristics

Active Publication Date: 2020-07-10
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, a fatal shortcoming of the above metal oxide catalysts is that there are few active metal oxide contact interfaces, and the active metal oxide nanoparticles are easy to detach from the support and interact with each other under the condition of long-term high-temperature reaction or the presence of water and oxygen in the reaction atmosphere. Agglomeration, sintering of active oxides and deactivation

Method used

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  • A medium and low temperature catalytic decomposition n <sub>2</sub> Catalyst and preparation method and application of o
  • A medium and low temperature catalytic decomposition n <sub>2</sub> Catalyst and preparation method and application of o
  • A medium and low temperature catalytic decomposition n <sub>2</sub> Catalyst and preparation method and application of o

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Experimental program
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Effect test

Embodiment 1

[0040] (a) Weigh 1.82g Co(NO 3 ) 2 ·6H 2 O, 1.61g Co(acac) 2 (The total amount of Co ions is 0.0125mol, and the mole fraction ratio of inorganic salts and organic salts is 1:1) and 35.1g (0.25mol) of hexamethylenetetramine are added to 1L of ethanol aqueous solution with a volume ratio of 2:1 and stirred Mix and add 3.43 g of polyvinylpyrrolidone to the mixed solution until complete dissolution. (b) Continue to add 15 mL of 3wt% H to the mixed solution 2 o 2 solution, after the solution system gradually turned black, the temperature was raised to 60° C., and vigorously stirred for 72 hours to obtain highly uniformly dispersed cobalt trioxide nanoparticle suspension. (c) 0.014g Zr(NO 3 ) 2 ·5H 2 O was dissolved in 210 mL of ethanol, and 30 mL of ethyl orthosilicate was added thereto to obtain a mixed solution of ethyl orthosilicate, zirconium nitrate and ethanol. (d) Add the mixed solution prepared in step (c) dropwise in situ to the suspension prepared in step (b), an...

Embodiment 2

[0046] (a) Weigh 1.19g CoCl 2 ·6H 2 O, 2.49g Co(Ac) 2 4H 2 O (the total amount of Co ions is 0.015mol, and the mole fraction ratio of its inorganic salts and organic salts is 0.5:1) and 42.2g (0.3mol) of hexamethylenetetramine are added to 1L of ethanol aqueous solution with a volume ratio of 2.5:1 Stir to mix, and add 3.66 g of polyvinylpyrrolidone to the mixed solution until complete dissolution. (b) Continue to add 20mL of 3wt%H to the mixed solution 2 o 2 solution, after the solution system gradually turned black, the temperature was raised to 55° C., and vigorously stirred for 12 hours to obtain a highly uniformly dispersed suspension of cobalt trioxide nanoparticles. (c) 0.32g Zr(NO 3 ) 2 ·5H 2 O was dissolved in 150 mL of ethanol, and 15 mL of ethyl orthosilicate was added thereto to obtain a mixed solution of ethyl orthosilicate, zirconium nitrate and ethanol. (d) Add the mixed solution prepared in step (c) dropwise in situ to the suspension prepared in step (...

Embodiment 3

[0051] (a) Weigh 1.82g Co(NO 3 ) 2 ·6H 2 O, 1.61g Co(acac) 2 (The total amount of Co ions is 0.0125mol, and the mole fraction ratio of inorganic salts and organic salts is 1:1) and 28.1g (0.2mol) of hexamethylenetetramine are added to 1L of ethanol aqueous solution with a volume ratio of 2:1 and stirred Mix and add 3.43 g of polyvinylpyrrolidone to the mixed solution until complete dissolution. (b) Continue to add 18 mL of 3 wt% H to the mixed solution 2 o 2 solution, after the solution system gradually turned black, the temperature was raised to 70° C., and vigorously stirred for 24 hours to obtain a highly uniformly dispersed suspension of cobalt trioxide nanoparticles. (c) 0.25g Zr(NO 3 ) 2 ·5H 2 O was dissolved in 210 mL of ethanol, and 30 mL of ethyl orthosilicate was added thereto to obtain a mixed solution of ethyl orthosilicate, zirconium nitrate and ethanol. (d) Add the mixed solution prepared in step (c) dropwise in situ to the suspension prepared in step (b...

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Abstract

The invention discloses a catalyst for catalytic decomposition of N2O at medium and low temperature. The catalyst comprises an active oxide inner core and a porous inert oxide shell layer, wherein the active oxide inner core consists of an active component Co3O4; the porous inert oxide shell layer consists of SiO2-NxOy; NxOy is one of ZrO2 and CeO2; and the catalyst comprises the following components by weight percentage: 10-40wt% of Co3O4, 0.1-3wt% of ZrO2 or CeO2, and the balance of SiO2. The catalyst has the advantages of good activity and long service life.

Description

technical field [0001] The invention belongs to a medium and low temperature catalytic decomposition of N 2 Catalyst, preparation method and application of O. Background technique [0002] With the development of chemical synthesis industries such as nitric acid and nylon 66, and the continuous consumption of fossil fuels, the atmospheric N 2 The O concentration continued to rise. N 2 O whose greenhouse effect potential is CO 2 310 times that of N is an important greenhouse gas. In addition, N 2 O is stable in the troposphere and, when transported to the stratosphere, can cause ozone depletion. Therefore, N 2 O elimination technology has become an important part of the current air pollution control research. [0003] In recent research N 2 In the removal method of O, direct catalytic decomposition of N 2 O generates O 2 and N 2 , is currently the most effective and widely recognized elimination method. Therefore, the development of catalysts with stable performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/56
CPCB01D53/8628B01D2255/2065B01D2255/20715B01D2255/20746B01D2255/30B01D2258/0283B01J23/83Y02C20/10
Inventor 王长真赵永祥王永钊李海涛
Owner SHANXI UNIV
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