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Method of decomposing n2o using a catalyst based on a cerium lanthanum oxide

A technology of catalysts and oxides, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, separation methods, etc., can solve problems such as insufficient catalyst stability, and achieve the effect of improving stability

Active Publication Date: 2011-09-14
RHODIA OPERATIONS SAS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A problem with known catalysts is that they exhibit insufficient stability over time

Method used

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  • Method of decomposing n2o using a catalyst based on a cerium lanthanum oxide

Examples

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Effect test

preparation example Construction

[0035] The method of preparation of this particular composition will now be described.

[0036] The method is characterized in that it comprises the following steps:

[0037] - forming a liquid medium comprising a cerium compound;

[0038] - heating the medium at a temperature of at least 100°C;

[0039] - separating the precipitate obtained in the preceding steps from the liquid medium, adding compounds of other rare earth metals (lanthanum and rare earth metals other than lanthanum and cerium) and forming another liquid medium;

[0040] - heating the medium thus obtained at a temperature of at least 100° C.;

[0041] - adjusting the reaction medium obtained in the above heating step to an alkaline pH;

[0042] - Isolation and calcination of the precipitate obtained in the preceding steps.

[0043] Thus, the first step of the method consists in forming a liquid medium comprising a cerium compound.

[0044] The liquid medium is usually water.

[0045] Preferably, the ceriu...

Embodiment 1

[0082] This example illustrates the N obtained on various catalysts after heat treatment at 950 °C under the above conditions 2 O conversion.

[0083] The catalysts were tested in the form of granules with a particle size between 0.5 mm and 1 mm. For each test, the weight of the catalyst was 10.5 g (i.e. the volume of the particles was 10 ml) and the hourly space velocity was 70000 h -1 .

[0084] The test conditions carried out in the laboratory are as follows:

[0085] Treated gas mixture contains 15% by volume water and 1000ppm N 2O, the rest is air. The water vapor content was regulated at a temperature of 60° C. by means of a stainless steel air humidifier.

[0086] Analysis of N by infrared at the outlet of the reactor 2 O. N is measured at a constant temperature equal to 850°C 2 O conversion.

[0087] The results obtained are given in Table 2 below.

[0088] Table 2 Catalyst

[0089] Under the same experimental conditions, the conversion level (N 2 ...

Embodiment 2

[0091] This example illustrates the N 2 O conversion rate.

[0092] The shaping of the catalyst and its experimental conditions were the same as described in Example 1.

[0093] The results obtained are given in Table 3 below.

[0094] table 3

[0095] catalyst

[0096] Table 3 shows that after heat treatment at 1050 °C, the catalyst of the present invention obtained better N 2 O conversion rate. In addition, the decrease in the activity of the catalyst of the present invention is much smaller than that of the catalyst of the comparative example.

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PUM

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Abstract

The invention relates to a method for decomposing N2O. This method is characterized in that it uses, as catalyst, an oxide based on cerium and lanthanum which further includes at least one oxide of an element chosen from zirconium and rare earths other than cerium and lanthanum. This catalyst is more stable, enabling it to be used at high temperature.

Description

technical field [0001] The present invention relates to the decomposition of N 2 O, wherein catalysts based on oxides of cerium and lanthanum are utilized. Background technique [0002] Known N 2 O is one of the gases involved in the greenhouse effect, which is increasingly desired to be reduced against the backdrop of global warming. [0003] In fact, N 2 O is present in large quantities in the emissions of some factories, such as those that manufacture nitric acid and adipic acid. In order to avoid the emission of N 2 O, these gases are treated to remove N 2 O decomposes into oxygen and nitrogen. In order for the decomposition to take place efficiently, the treatment requires the use of a catalyst. [0004] Catalysts for this type of treatment are available, for example, compositions based on magnesium oxide or calcium oxide, on nickel oxides and cobalt oxides or on copper oxides and zinc oxides, or on cerium oxides and Compositions of cobalt oxides or based on cer...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01J21/06B01J23/10
CPCB01D2255/9205B01D2255/20715B01D53/8628B01J23/002B01J23/83B01D2257/402B01J37/031B01D2255/206Y02C20/10B01D2255/20746B01D2255/20738B01D2255/9202B01J23/10B01D2255/20761B01D2255/9207B01J2523/00Y02P20/30B01J2523/3706B01J2523/3712B01J2523/3718B01J2523/48
Inventor 克里斯蒂安·哈莫埃马纽埃尔·罗阿尔
Owner RHODIA OPERATIONS SAS
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