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Efficient catalyst for decomposition of N2O and preparation method and application thereof

A catalyst and high-efficiency technology, applied in separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of limited development and high catalyst cost, and achieve the effect of restoring catalytic activity, high activity, and good catalytic activity.

Active Publication Date: 2016-03-02
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there is no mature technology for reducing exhaust emissions from adipic acid production plants in China, mainly because most of the catalysts are difficult to operate in various gases (NOx, H 2 O, SO 2 etc.) show good catalytic activity and stability under the condition of existence, and the cost of catalyst is higher, N 2 The catalytic decomposition of O requires a high temperature of about 500-800 °C, which severely limits the development of tail gas emission reduction technology for adipic acid plants.

Method used

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  • Efficient catalyst for decomposition of N2O and preparation method and application thereof
  • Efficient catalyst for decomposition of N2O and preparation method and application thereof
  • Efficient catalyst for decomposition of N2O and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Preparation of Immobilized CoO / MgAl 2 O 4 / Al 2 O 3 catalyst:

[0040] A. The Co(NO 3 ) 2 , Mg(NO 3 ) 2 , Al(NO 3 ) 3 Dissolve in deionized water in a molar ratio of 2:1:1 to obtain a solution with a total concentration of 0.3M, mix urea with NO in the solution 3 - The molar ratio of 4:1 was added to the solution and dissolved until the solution became transparent.

[0041] B. The γ-Al 2 O 3 The carrier was activated and washed with NaOH solution with a mass concentration of 3%, immersed in the solution obtained in step A, sealed in a hydrothermal reactor, grown in situ at 90°C for 48h, taken out, filtered and washed with water, dried at 100°C for 24h, A catalyst precursor is obtained.

[0042] C. Put the catalyst precursor prepared in step B into a muffle furnace, heat and roast at a heating rate of 10 °C / min from room temperature, heat up to 700 °C and roast for 3 hours, and take out the roasted product after cooling to room temperature with the furnace ...

Embodiment 2

[0045] Preparation of Immobilized MgO / ZnAl 2 O 4 / Al 2 O 3 catalyst:

[0046] (1) Zn(NO 3 ) 2 , Mg(NO 3 ) 2 , Al(NO 3 ) 3 Dissolve in deionized water in a molar ratio of 3:1:1 to obtain a solution with a total concentration of 0.2M, mix hexamethylenetetramine with NO in the solution 3 - The molar ratio of 3:1 was added to the solution and dissolved until the solution became transparent.

[0047] (2) γ-Al 2 O 3 The carrier used a mass concentration of 5% (NH 4 ) 2 SO 4 The solution was activated and washed, immersed in the solution obtained in step A, sealed in a hydrothermal reactor, grown in-situ at 90°C for 72 hours, taken out, filtered, washed with water, and dried at 100°C for 12 hours to obtain a catalyst precursor.

[0048] (3) put the catalyst precursor prepared in step B into a muffle furnace, heat and roast at a heating rate of 5 °C / min from room temperature, heat up to 600 °C and roast for 5 hours, and take out the roasted product after cooling to roo...

Embodiment 3

[0051] Preparation of Immobilized CuO / ZnAl 2 O 4 / Al 2 O 3 catalyst:

[0052] (1) Cu (NO 3 ) 2 , Zn(NO 3 ) 2 , Al(NO 3 ) 3 Dissolve in deionized water in a molar ratio of 0.5:0.5:1 to obtain a solution with a total concentration of 0.1M. Press urea with NO 3 The molar ratio of 5:1 was added to the solution and dissolved until the solution became transparent.

[0053] (2) The γ-Al2O3 carrier is activated and washed with a NaOH solution with a concentration of 1%, immersed in the solution obtained in step A, sealed in a hydrothermal reactor, grown in-situ at 120 ° C for 60h, taken out, filtered and washed with water, After drying at 90 °C for 10 h, the catalyst precursor was obtained.

[0054] (3) put the catalyst precursor prepared in step B into a muffle furnace, heat and calcinate at a heating rate of 10 °C / min from room temperature, heat up to 500 °C and calcinate for 2 hours, and take out the calcined product after cooling to room temperature with the furnace to...

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Abstract

The present invention provides an efficient catalyst for decomposition of N2O and a preparation method and application thereof. The catalyst comprises an active center and a carrier; the active center includes quantum dot oxide and spinel-type structural compound, and the carrier is a Al2O3 carrier; and the catalyst has a molecular formula L IIxO / M II1-xNIII2O4 / Al2O3, wherein: L II and M II are divalent metal cations, N III is a trivalent metal cation, and x equals to 0.01-1.0. The efficient catalyst for decomposition of N2O has high activity, good stability and low N2O decomposition temperature, is conducive to the purification of industrial waste gas from adipic acid plant; and the catalyst for decomposing N2O can significantly reduce the N2O concentration in industrial emission, reduce air pollution and protect the environment.

Description

technical field [0001] The invention belongs to the field of catalysts used in air pollution control technology, in particular to a kind of catalyst for decomposing N 2 High-efficiency catalyst of O and its preparation method and application. Background technique [0002] The domestic production of adipic acid mainly adopts the cyclohexanol nitric acid oxidation method, and the cyclohexanol is oxidized by nitric acid to produce adipic acid. This method is mature in technology, and the product yield and purity are relatively high, but the amount of nitric acid is large, and a large amount of production is produced in the reaction process. N 2 O, and the exhaust gas emitted in the production process is concentrated, large in quantity and high in purity. At present, the annual production of 150,000 tons of adipic acid by cyclohexanol nitric acid oxidation method, N 2 The annual emission of O can reach 45,000 tons. [0003] N 2 O is a type of greenhouse gas, which is more d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J23/06B01J23/80B01J23/89B01D53/86B01D53/56
CPCY02C20/10Y02P20/30
Inventor 陈涛艾晓欣刘文李亚楠江屿杨琦武陈晨徐航
Owner CHINA TIANCHEN ENG
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