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Catalyst used for decomposing N2O and preparation method and application thereof

A catalyst and molecular technology, used in the preparation of the catalyst and the field of catalysts for decomposing N2O, can solve the problems of low roasting temperature and deactivation of catalysts at decomposition temperature.

Inactive Publication Date: 2010-06-23
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, although some catalysts in the prior art have better activity, but the calcination temperature is on the low side, there is still a big gap with industrial application; some catalysts decompose at a higher temperature and easily deactivate the catalyst
And the combination of the carrier of the present invention and the active component and its preparation method have not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of 10% Cu loading 0.05 Zn 0.95 al 2 o 4 / γ-Al 2 o 3 catalyst:

[0032] Take 0.1492g of copper nitrate and 3.4912g of zinc nitrate, dissolve them in water respectively, and prepare a mixed solution to obtain an aqueous solution containing copper and zinc nitrate; 2 o 3 The carrier is dipped in an aqueous solution, and the water is evaporated at 50°C until the solid-liquid reaches a homogeneous state, and then dried in an oven at 140°C for 6 hours to make it uniformly loaded on the γ-Al 2 o 3 On the carrier, the catalyst precursor is obtained, and then the precursor is roasted at 400 ° C for 8 hours to obtain the Cu with a loading of 10% in the present invention 0.05 Zn 0.95 al 2 o 4 / γ-Al 2 o 3 Catalyst, XRD analysis results show that the composite metal oxide has a spinel structure.

[0033] The catalyst is used for N 2 Decomposition of O, the gas composition is: 12v% N 2 O, 16.8v% O 2 , and the rest are N 2 Under the condition of N 2 O de...

Embodiment 2

[0036] Prepared with 25% Cu loading 0.5 Zn 0.5 al 2 o 4 / γ-Al 2 o 3 catalyst:

[0037] Take 3.7516g of copper nitrate and 4.6194g of zinc nitrate, dissolve them in water respectively, and prepare a mixed solution to obtain an aqueous solution containing copper and zinc nitrate; 2 o 3 The carrier is immersed in an aqueous solution, and the water is evaporated at 70°C until the solid-liquid reaches a homogeneous state, and then dried in an oven at 110°C for 8 hours to make it uniformly loaded on the γ-Al 2 o 3 On the carrier, the catalyst precursor is obtained, and then the precursor is roasted at 700 ° C for 5 hours to obtain the loading capacity of the present invention is 25% Cu 0.5 Zn 0.5 al 2 o 4 / γ-Al 2 o 3 Catalyst, XRD analysis results show that the composite metal oxide has a spinel structure.

Embodiment 3

[0039] Prepared with 50% Cu loading 0.95 Zn 0.05 al 2 o 4 / γ-Al 2 o 3 catalyst:

[0040] Take 11.8468g of copper acetate and 0.6855g of zinc acetate, dissolve them in water respectively, and prepare a mixed solution to obtain an aqueous solution containing copper and zinc acetate; 2 o 3 The carrier is immersed in an aqueous solution, and the water is evaporated at 90°C until the solid-liquid reaches a homogeneous state, and then dried in an oven at 90°C for 12 hours to make it evenly loaded on the γ-Al 2 o 3 On the carrier, the catalyst precursor is obtained, and then the precursor is roasted at 1000 ° C for 2 hours to obtain the loading capacity of the present invention is 50% Cu 0.95 Zn 0.05 al 2 o 4 / γ-Al 2 o 3 Catalyst, XRD analysis results show that the composite metal oxide has a spinel structure.

[0041] The catalyst is used for N 2 Decomposition of O, the gas composition is: 12v% N 2 O, 16.8v% O 2 , and the rest are N 2 Under the condition of N 2 O ...

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Abstract

The invention relates to a catalyst used for decomposing N2O and a preparation method and application thereof, which are characterized in that an active component is a composite oxide which contains copper oxide and zinc oxide and has a spinelle structure or a perovskite-like structure, and the composite oxide is loaded on a gamma-Al2O3 carrier, and auxiliary metallic oxides can also be added; the nitrate or the acetate of the composite oxide is dissolved in water; the gamma-Al2O3 carrier is dipped, is evaporated to remove water and then is dried to obtain a precursor; and then the precursor is baked to obtain the catalyst. The catalyst is used for decomposing N2O and has high activity and high stability; the catalyst is used for the direct decomposition of N2O; the decomposing temperature of N2O is low, and the complete decomposition temperature is lower than or equal to 615 DEG C; after an intensified experiment is carried out for 100 hours, the catalyst still keeps the advantage and effect of high activity.

Description

technical field [0001] The invention relates to a catalyst used in air pollution control technology, in particular to a catalyst for decomposing N 2 The catalyst of O; The present invention also relates to the preparation method and the use of the catalyst. Background technique [0002] Nitrous oxide (N 2 O) is also known as nitrous acid gas and laughing gas. It has both the greenhouse effect and the destruction of the ozone layer. It is one of the three main greenhouse gases. N 2 O has a lifetime of more than 100 years in the atmosphere and is easy to accumulate in the atmosphere. Atmospheric N 2 The concentration of O is about 310nmol / mol, and it increases at a rate of about 0.2% to 0.3% per year (Yao Rongkui, Yu Zhongju, Xu Xuewu et al. The method of GC-ECDmeasurement of atmospheric N 2 O and its concentration, sources [J]. Environment Chemistry, 1994, 13(1): 22-29). N 2 O originates from oceans, land, agriculture, combustion processes of various fossil fuels and t...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J23/83B01J23/889B01D53/56
CPCY02C20/10
Inventor 李翠清李敏王虹宋永吉
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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