KR20100045148A - The preparation method of patinium powder that is used for catalyst - Google Patents

Abstract

PURPOSE: A preparation method of patinium powder for a catalyst is provided to improve dispersibility and catalyst activation by forming particles with a size of approximately 2~5nm. CONSTITUTION: A preparation method of patinium powder for a catalyst comprises the steps of: distributing a solid carrier and pouring a platinum solution on the carrier so that nano sized platinum particles are fixed on the solid carrier and drying and plasticizing the platinum solution. The platinum solution is selected from the group consisting of Ptx, PtClx and Pt_6. The support element is selected from the group consisting of Al_2O_3, SiO_2, TiO_2, CeO_2, and ZiO_2. The plasticizing temperature is 300~500°C.

Description

The preparation method of patinium powder that is used for catalyst}

The present invention relates to a method for producing platinum powder for catalysts, and more particularly, to a method for producing platinum powder for catalysts used in automobile exhaust gas, various exhaust gas purification apparatuses, and fuel cell activity.

Platinum is widely used in places such as automobile exhaust gas, various exhaust gas purification devices, and fuel cell activity. Recently, the technology of increasing the catalytic activity with a small amount as the precious metal price is rising has been increasing interest.

As a method of preparing a catalyst, there are an impregnation method of impregnating a support in a noble metal solution and a method of preparing a coating catalyst in a support after injecting a noble metal into a support slurry to prepare a washcoat, which is the most commonly used method.

However, the catalyst prepared by the conventional method has a disadvantage in that the size of the catalyst increases when it is aged at a high temperature, and thus the dispersibility is poor. As the expensive precious metal is used, the demand for increased activity still remains a problem.

Accordingly, it is an object of the present invention to provide a process for the production of precious metal powders which can increase dispersibility and also increase catalytic activity.

The method for producing the platinum powder for the catalyst of the present invention is characterized in that the precious metal is fixed on the carrier in the dry state rather than in the slurry state.

The object of the present invention is to disperse the carrier, and then add the platinum solution as fine particles to fix the nanoparticle size on the solid carrier, followed by drying and calcining the method for producing a platinum powder for the catalyst Is achieved.

The noble metal powder prepared by the production method of the present invention has a particle size of about 2 to 5 nm and the dispersibility is increased and the catalytic activity is also increased compared to the noble metal powder prepared by the prior art.

In the method of preparing the platinum powder for the catalyst of the present invention, first, a platinum solution (Pt-Nitrate, Pt-Chloride, Pt (OH) ₆ , other Pt solution) is supported by a nanoparticle size carrier (Al ₂ O ₃ , SiO ₂ , TiO). ₂ , CeO ₂ , ZiO ₂ , etc.) to maximize the active particle surface, followed by high temperature treatment and reduction to prepare the final finished product.

An example of the manufacturing method of the present invention is disclosed in FIG.

For example, after the alumina carrier is dispersed in a dry manner, a platinum solution is added to fix the platinum on the alumina, and then dried and calcined at 500 ° C. Thus prepared platinum powder of the present invention has a particle size of about 2 ~ 5nm. The concentration of the added platinum solution is usually 20% or less, preferably 10% or less.

The present invention will be described in more detail with reference to the following Examples.

Example 1 Method of Preparation with Pt-Chloride Solution

Two blade-shaped blades rotate and rotate while rotating the mixer which reduces dead space as much as possible by precisely spaced blades and inner surface of the tank, and disperses the alumina carrier in the tank space in a fine manner. It was injected into the particles and fixed. The fixed material was dried in a short period without loss with a vibration dryer (Vibration Dryer) and then calcined precious metal powder by rolling with a rotary furnace (Rotary Furnace) equipment to roll 300 ~ 500 ℃ to obtain a platinum catalyst powder.

Example 2 Preparation of Pt-Nitrate Solution

Two blade-shaped blades rotate and rotate while rotating the mixer, which reduces dead space to the maximum by rotating the blade and the inner surface of the tank at high speed. The solution was put into microparticles and fixed. The fixed material was dried in a short period of time without loss with a vibration dryer (Vibration Dryer) and then calcined by rolling the precious metal powder with a rotary furnace (Rotary Furnace) equipment to 300 ~ 500 ℃ to obtain a platinum catalyst powder.

Example 3 Pt (OH) ₆  How to prepare as a solution

Two blade-shaped blades rotate and rotate while rotating the mixer which reduces dead space as much as possible by precise space between inner blade and tank, and disperses the silica carrier in the tank space. ₆ ) The solution was added as fine particles and fixed. The fixed material was dried in a short period without loss with a vibration dryer (Vibration Dryer) and then calcined precious metal powder by rolling with a rotary furnace (Rotary Furnace) equipment to roll 300 ~ 500 ℃ to obtain a platinum catalyst powder.

[Test Example 1]

Figure 2a is a platinum powder prepared according to Example 1 of the present invention, the size of the platinum particles are evenly dispersed to about 1 ~ 2nm. Figure 2b is a TEM photograph after aging 750 ℃ 25hr. Usually, the particle size increases to about 30 to 50 nm after aging at 750 ° C. × 25 hr. The platinum powder developed in the present invention shows that the particle size of platinum does not grow as much as 20 nm or less even after aging.

[Test Example 2]

With the platinum powder prepared according to Example 1 of the present invention, a DOC catalyst, which is a vehicle exhaust gas aftertreatment device, was manufactured and the actual vehicle test was performed. As a test vehicle, 2.0L, D-eng, and VGT Santa Fe were used. The results are posted in FIG. 3.

1 is a flow chart showing the outline of the manufacturing method of the present invention.

Figure 2 is a TEM photograph of the platinum powder prepared by the present invention, Figure 2a is a TEM photograph before aging, Figure 2b after aging 750 ℃ 25 hr.

Figure 3 is a graph showing the performance test results of the platinum powder prepared by the prior art.

Claims (4)

After dispersing the carrier, the platinum solution is added as fine particles, the nanoparticles are fixed to a nanoparticle size on the solid carrier, and then dried and calcined. The method of claim 1, The platinum solution is a method for producing a platinum powder for the catalyst, characterized in that selected from the group consisting of Pt (NO 3) x, PtClx and Pt (OH) ₆ . The method of claim 1, The support is a method for producing a platinum powder for a catalyst, characterized in that selected from the group consisting of Al ₂ O ₃ , SiO ₂ , TiO ₂ , CeO ₂ , and ZiO ₂ . The method of claim 1, The firing temperature is 300 to 500 ℃ method for producing a platinum powder for the catalyst, characterized in that.

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