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Purification catalyst for exhaust gas, production method therefor, and purification catalyst device for exhaust gas

A technology for exhaust gas purification and manufacturing method, which is applied in exhaust devices, catalyst activation/preparation, chemical elements of heterogeneous catalysts, etc., and can solve problems such as reduction of active points and reduction of activity

Inactive Publication Date: 2005-09-21
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, loaded on Al 2 o 3 Even if the Pd on the surface exists in the state of PdO in the initial stage, it will be reduced to Pd in ​​the metal state at high temperature (greater than or equal to 900 ° C), and the Pd aggregation will cause the reduction of active sites and greatly reduce the activity.

Method used

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  • Purification catalyst for exhaust gas, production method therefor, and purification catalyst device for exhaust gas
  • Purification catalyst for exhaust gas, production method therefor, and purification catalyst device for exhaust gas
  • Purification catalyst for exhaust gas, production method therefor, and purification catalyst device for exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0057] The present invention will be described in further detail below according to the examples.

[0058] 1. First Embodiment

manufacture example 1

[0060] 2.96 g (0.014 mol) of strontium nitrate, 1.86 g (0.007 mol) of palladium nitrate, and 3.75 g (0.028 mol) of malic acid were dissolved in 100 ml of ion-exchanged water to prepare a mixed metal nitrate aqueous solution. Then prepare the above-mentioned mixed metal nitrate aqueous solution, put it on the electric hot plate stirrer, stir it with a stirring bar, and evaporate and dry it at 250°C at the same time, then transfer it to an alumina crucible, and use a muffle furnace to heat the mixture at 2.5°C / min The speed is raised to 350°C, and heat treatment is performed at 350°C for 3 hours. Thus, a pseudo-calcined body from which nitrate groups were removed was produced.

[0061] The above-mentioned to-be-roasted body was pulverized and mixed for 15 minutes in a mortar, and then put into an alumina crucible, and the temperature was raised to 750°C with a muffle furnace at a rate of 5°C / min, and kept at 750°C for 10 hours to perform the main roasting. Next, the catalyst po...

manufacture example 2

[0063] Using barium nitrate instead of the strontium nitrate used in the above Production Example 1, Ba 2 PdO 3 exhaust gas purification catalyst. The other conditions were the same as in Production Example 1.

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PUM

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Abstract

A purification catalyst for exhaust gas enhances the activities of noble metals, preventing a drop in activities at high temperatures, and exhibiting a satisfactory performance even in low temperature (below 400° C.) operation when starting up or during idling of automobiles. The Pd-based composite oxide contains at least one element selected from alkaline earth metals.

Description

technical field [0001] The present invention relates to an exhaust gas purification catalyst and a manufacturing method thereof, and a vehicle exhaust gas purification catalyst device, in particular to a manufacturing technology of an exhaust gas purification catalyst, which can make the nitrogen oxides in the gas discharged from internal combustion engines such as automobiles run at low temperature (NO x ), hydrocarbons (HC) and carbon monoxide (CO) are effectively purified and reduced at the same time. Background technique [0002] In the exhaust (such as CO, HC, NO, NO 2 etc.), noble metal elements (Pt, Rh, Pd, Ir) are known to have excellent properties, and therefore, the above-mentioned noble metals are particularly suitable for use in exhaust gas purification catalysts. Usually these noble metals are mixed with additives such as lanthanum (La), cerium (Ce), neodymium (Nd) or loaded on the carrier Al with a high specific surface area. 2 o 3 use on. On the other han...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01J23/00B01J23/58B01J37/02
CPCB01D2255/206B01J37/0236B01D2255/1023B01J23/002B01D53/945B01J23/58B01D2255/204B01D2255/40B01J2523/00Y02T10/22Y02A50/20Y02T10/12B01J2523/25B01J2523/824B01J2523/24B01J2523/31B01J2523/3706
Inventor 木口一德松尾雄一铃木纪彦古川敦史
Owner HONDA MOTOR CO LTD
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