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Method for processing a gas for reducing the carbon dioxide content thereof

A carbon dioxide, gas treatment technology, applied in the field of gas treatment to reduce its carbon dioxide content

Inactive Publication Date: 2011-04-27
RHODIA OPERATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These materials capture CO 2 aspect is effective, but has the ability to convert CO 2 release disadvantage

Method used

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  • Method for processing a gas for reducing the carbon dioxide content thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] This example relates to the preparation of rare earth metal-based compounds useful in the methods of the invention.

[0087] Four compounds were prepared, the compositions of which are given in Table 1 below.

[0088] Table 1

[0089] compound

CeO 2 (wt%)

La 2 o 3 (wt%)

ZrO 2 (wt%)

PR 6 o 11 (wt%)

SBET (1) (m 2 / g)

Example 1-A

90

0

5

5

70

Example 1-B

80

3

10

7

45

Example 1-C

90

5

0

5

73

Example 1-D

86

4

10

0

73

[0090] (1) This is the specific surface area of ​​the composition at the end of the preparation given in the examples.

[0091] The preparation of various compounds is given below.

Embodiment 1-A

[0093] This example illustrates the formula CeO 2 -ZrO 2 -Pr 6 o 11 The preparation of mixed oxides having the composition in Table 1 and obtained by a process of the type described in the above-mentioned EP-A-906244 can be found in this document.

[0094] The ceric nitrate solution (obtained according to document FR-A-2 570 087) (by adding NH 4 OH is pre-neutralized so that r=-0.22), praseodymium nitrate solution and zirconyl nitrate solution (satisfying OH - / Zr molar ratio = 1.17) are mixed in the stoichiometric ratio required to produce the above-mentioned mixed oxide.

[0095] r represents the degree of neutralization of the cerium solution defined by the following formula:

[0096] r = n 3 - n 2 n 1

[0097] where n1 represents the total number of moles of Ce(IV) present in the solution after neutralization, and n...

Embodiment 1-B

[0102] This example illustrates the formula CeO having the composition in Table 1 2 -ZrO 2 -La 2 o 3 -Pr 6 o 11 Preparation of mixed oxides.

[0103] The operation mode is the same as that of Example 1-A, and lanthanum nitrate and other precursors are added in addition. The final calcination was carried out at 850° C. for 2 hours.

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Abstract

The invention relates to a method for processing a gas in order to reduce the carbon dioxide content thereof, wherein the method is characterised in that it comprises contacting the gas with a compound of at least one rare earth element, whereby the carbon dioxide is adsorbed on the compound and a carbon-dioxide depleted gas is obtained. The compound may more particularly contain an oxide, and the rare earth element may particularly be selected from cerium, lanthanum or praseodymium.

Description

technical field [0001] The present invention relates to methods of treating gases to reduce their carbon dioxide content. Background technique [0002] Known carbon dioxide (CO 2 ) is a gas that contributes to the greenhouse effect. For ecological reasons, there is an increasing need to limit its production. [0003] Already exists to make it possible to capture CO in the gas 2 The gas is in particular the exhaust gas emitted by industrial plants such as gas turbines or boilers. [0004] Some of these methods use amines in solvent media. Disadvantages of these methods are the high cost of the amines and their instability at high temperatures. Other approaches employ inorganic materials based on alkaline earth metals such as barium or calcium or on alkali metals such as potassium. These materials capture CO 2 aspect is effective, but has the ability to convert CO 2 The disadvantages of release. [0005] Thus, there is a need for methods in which for capturing CO 2 T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02B01J20/06C01B32/50
CPCY02C10/08B01J20/305B01J20/28057B01D53/02B01J20/3085B01D2253/10B01D2259/4009B01J20/3078B01D2257/504Y02C20/40
Inventor V·哈勒G·米格纳尼
Owner RHODIA OPERATIONS SAS
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