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Selective catalyst for removing oxynitrides from tail gases of diesel vehicles and preparation method thereof

A nitrogen oxide, selective technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. problem, to achieve the effect of good resistance to H2O and SO2 poisoning, convenient operation and low cost

Inactive Publication Date: 2010-12-15
CHINA AUTOMOTIVE TECH & RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the basis of the V-Zr-W-Ti system, the present invention improves the preparation method, and improves the powder catalyst into a honeycomb SCR catalyst suitable for removing nitrogen oxides in the exhaust of diesel vehicles, and at the same time overcomes the existing problems in purifying diesel vehicles The catalyst used for nitrogen oxides in the exhaust gas has a narrow active temperature window and is resistant to H 2 O and SO 2 Poor poisoning ability and other issues

Method used

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  • Selective catalyst for removing oxynitrides from tail gases of diesel vehicles and preparation method thereof
  • Selective catalyst for removing oxynitrides from tail gases of diesel vehicles and preparation method thereof

Examples

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Embodiment 1

[0027] Example 1 Weigh 3.33 g of oxalic acid and dissolve it in water, heat it at 80°C to completely dissolve, and prepare a 5% oxalic acid aqueous solution. Add 2g of vanadium pentoxide to the oxalic acid solution, and stir for 0.5h at a constant temperature of 70°C until it is completely dissolved. Then add 8.3 g of zirconyl nitrate to the above solution, and stir for 0.5 h at a constant temperature of 70°C until it is completely dissolved. Add 200ml of water to the system, continue to add 100g of tungsten titanium powder, that is, add 8-10g of tungsten trioxide and 90-92g of titanium dioxide, and stir at 70°C until it is completely dissolved. 20% of the mass of the mixed solution was added to polyacrylamide as a binder, and stirred at room temperature for 2 hours until completely dissolved to obtain a slurry. The blank cordierite honeycomb ceramic carrier was immersed in the slurry, and the residual liquid in the pores was blown out after removal, dried at 100°C for 1.5 hou...

Embodiment 2

[0029] Weigh 4.67 g of oxalic acid and dissolve it in water, heat it at 60°C to completely dissolve, and prepare an 8% oxalic acid aqueous solution. Add 4g of vanadium pentoxide to the oxalic acid solution, and stir for 0.5h at a constant temperature of 60°C until it is completely dissolved. Then add 6.7 g of zirconium oxychloride to the above solution, and stir for 0.5 h at a constant temperature of 60°C until it is completely dissolved. Add 200ml of water to the system, continue to add 100g of tungsten titanium powder, that is, add 8-10g of tungsten trioxide and 90-92g of titanium dioxide, and stir at a constant temperature of 60°C until completely dissolved. A silica sol with 5% of the mass of the mixed solution was added thereto as a binder, and stirred at room temperature for 2 hours until completely dissolved to obtain a slurry. The blank cordierite honeycomb ceramic carrier was immersed in the slurry, and the residual liquid in the pores was blown out after removal, dri...

Embodiment 3

[0031] Weigh 4.67 g of oxalic acid and dissolve it in water, heat it at 60°C to completely dissolve, and prepare an 8% oxalic acid aqueous solution. Add 6g of vanadium pentoxide to the oxalic acid solution, and stir for 0.5h at a constant temperature of 60°C until it is completely dissolved. Then add 11.7 g of zirconium acetate to the above solution, and stir it for 0.5 h at a constant temperature of 60°C until it is completely dissolved. Add 200ml of water to the system, continue to add 100g of tungsten titanium powder, that is, add 8-10g of tungsten trioxide and 90-92g of titanium dioxide, and stir at a constant temperature of 60°C until completely dissolved. 25% of the mass of the mixed solution is added to methylcellulose as a binder, and the mixture is stirred at room temperature for 2 hours to completely dissolve to obtain a slurry. The blank cordierite honeycomb ceramic carrier was immersed in the slurry, and after taking it out, the residual liquid in the pores was blo...

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Abstract

The invention discloses a selective catalyst for removing oxynitrides from tail gases of diesel vehicles and a preparation method thereof. Cordierite honeycomb ceramic serves as a carrier, and the oxides of vanadium, zirconium, tungsten and titanium form a catalytic active site. The preparation method comprises the following steps of: sequentially dissolving vanadium pentoxide, a zircon salt, tungsten trioxide and titanium dioxide into the aqueous solution of oxalic acid, adding a bonder into the mixed solution to prepare pulp, impregnating the cordierite honeycomb ceramic in the pulp, drying the cordierite honeycomb ceramic for 1 to 3 hours at 100 to 150 DEG C, and roasting the cordierite honeycomb ceramic for 2 to 4 hours at 450 to 550 DEG C. In the invention, the preparation method is improved, and a powder catalyst is improved into a honeycomb selective catalytic reduction (SCR) catalyst applied to the removal of the oxynitrides from the tail gases of the diesel vehicles, so the high-efficiency catalytic removal of the oxynitrides can be realized at the temperature of 205 to 515 DEG C; and in the presence of steam or SO2, the activity of the catalyst is kept over 80 percent.

Description

Technical field [0001] The invention relates to a selective catalyst and a preparation method thereof, and more specifically, to a selective catalyst for removing nitrogen oxides and a preparation method thereof. Background technique [0002] In 2009, my country's automobile production and sales exceeded 10 million, ranking first in the world. Production in the first half of 2010 was over 8 million vehicles, and it is expected to exceed 15 million vehicles throughout the year. With the development of the automobile industry, energy and environmental pollution problems have become very serious. In response to the above problems, my country has proposed energy-saving emission reduction policies. Compared with gasoline vehicles, diesel vehicles are more energy-efficient and emit less greenhouse gases. Therefore, diesel vehicles with better fuel economy and emission characteristics have attracted more and more attention. With the increasing popularity of diesel vehicles, it also b...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/94B01D53/56
CPCY02T10/24Y02A50/20Y02T10/12
Inventor 王建强王务林李振国吴春玲马杰沈美庆
Owner CHINA AUTOMOTIVE TECH & RES CENT
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