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Catalyst for purifying exhaust gas

A waste gas purification and catalyst technology, which is applied in the direction of physical/chemical process catalysts, catalyst activation/preparation, heterogeneous catalyst chemical elements, etc., can solve the problems of absolute reaction area reduction and limited space, and achieve excellent gas purification performance.

Active Publication Date: 2014-12-10
MITSUI MINING & SMELTING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the space in the engine room is limited, it is necessary to miniaturize the DOC, and there is a trade-off between the increase in efficiency due to temperature and the reduction in absolute reaction area due to miniaturization.

Method used

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  • Catalyst for purifying exhaust gas
  • Catalyst for purifying exhaust gas
  • Catalyst for purifying exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~7 and comparative example 1

[0050] Mix Yttrium Nitrate solution with known metal concentration and Manganese Nitrate solution separately so that Y and Mn reach Mn / Y=2, adjust the concentration with ion-exchanged water so that YMO finally obtained reaches 50g / L, and make raw material liquid. To 2.5%NH 3 Ion-exchanged water was added to an aqueous solution obtained by mixing 26.59 mL of an aqueous solution and 11.33 mL of 30% hydrogen peroxide water to prepare 265.9 mL to prepare a precipitant. Thereafter, a precipitating agent is added dropwise to the raw material liquid to form a precipitate, and the obtained precipitate is filtered and washed, followed by heating to obtain a powder.

[0051] 37.5 g of water was added to 0.124 g of silver nitrate, and stirred to prepare an aqueous solution of silver nitrate. Further, manganese nitrate was added to form an aqueous solution so as to contain an excess of Mn shown in Table 1, and 1.5 g of the above was added to each aqueous solution. The obtained powder wa...

Embodiment 8~11

[0054] Separately prepare yttrium nitrate solution and manganese nitrate solution with known metal concentrations, mix them separately so that Y and Mn reach the Mn excess ratio shown in Table 1, and adjust the concentration with ion-exchanged water so that the finally obtained YMO reaches 50 g / L , so as to make the raw material liquid. On the other hand, towards 2.5%NH 3 Ion-exchanged water was added to an aqueous solution obtained by mixing 26.59 mL of an aqueous solution and 11.33 mL of 30% hydrogen peroxide water to prepare 265.9 mL to prepare a precipitant.

[0055] Thereafter, a precipitating agent is added dropwise to the raw material solution to generate a precipitate, and the precipitate is filtered and washed, followed by heating to obtain a powder.

[0056] 37.5 g of ion-exchanged water was added to 0.124 g of silver nitrate, and stirred to prepare an aqueous silver nitrate solution. 1.5 g of each of the above-mentioned powders was put into the solution and heated ...

Embodiment 12~20

[0067] Yttrium nitrate solution, manganese nitrate solution and lanthanum nitrate solution were mixed separately in such a manner that Y and La reached the ratio shown in column a of Table 2 and (Y+La) and Mn reached the ratio shown in column b of Table 2, In addition, the same operation as in Example 1 is obtained by (Y 1-x La x )Mn 2+y o 5 The exhaust gas purification catalysts of Examples 12 to 20 made of multiple oxides. The Ag loading amount of the obtained catalyst for exhaust gas purification was 5.57% by mass based on the total mass of metal Ag+support.

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PUM

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Abstract

The present invention contains a complex oxide comprising a crystal having a DyMn2O5 structure, in which an A site contains Y and a B site contains Mn, the composition ratio between the B site and the A site (B / A) being greater than 2.

Description

technical field [0001] The present invention relates to an exhaust gas purifying catalyst for purifying exhaust gas exhausted from internal combustion engines of automobiles and the like. Background technique [0002] Exhaust gas from internal combustion engines such as automobiles contains harmful components such as hydrocarbons, carbon monoxide, and nitrogen oxides. [0003] In addition, exhaust gas discharged from a diesel engine contains particulates (PM; particulate matter), which cause air pollution when directly discharged into the atmosphere. As an effective method for removing particulates, there is a diesel exhaust capture system using a diesel particulate filter (DPF) for capturing soot. [0004] On the other hand, in order to efficiently purify diesel exhaust gas, attempts have been made to place a diesel oxidation catalyst (DOC) as close as possible to the engine, thereby utilizing the heat of the engine to promote the gas purification reaction. However, since...

Claims

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Application Information

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IPC IPC(8): B01J23/68B01D53/94F01N3/023F01N3/035F01N3/10
CPCB01D2255/2061B01J23/6562B01J23/688B01D2255/2063B01J35/002B01D2255/206B01D53/944B01D2255/2073F01N2510/065B01D2255/104B01J23/34B01J37/03B01J37/0215B01J2523/00B01J35/30B01J2523/18B01J2523/36B01J2523/72B01J2523/3706
Inventor 高木启充高桥进渡边彦睦杉冈晶子阿部晃古川孝裕石崎启太大矢直树中贵弘
Owner MITSUI MINING & SMELTING CO LTD
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