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Preparation method of diesel engine exhaust denitration catalyst

A technology of denitrification catalyst and diesel engine, applied in the field of denitrification catalyst, can solve the problems of short service life of denitrification catalyst, low denitrification efficiency, inability to adapt to various working conditions, etc., and achieve the effect of improving extrusion integration, high denitrification efficiency and improving plasticity

Inactive Publication Date: 2016-11-09
上海净球环保科技有限公司
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Problems solved by technology

[0010] In order to solve the defects that the denitrification catalyst prepared by the prior art has short service life and cannot adapt to various working conditions, especially the low denitrification efficiency when the diesel engine rotates at a low speed, the present invention provides a method for preparing a diesel engine exhaust denitrification catalyst, and its technical scheme as follows:

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  • Preparation method of diesel engine exhaust denitration catalyst
  • Preparation method of diesel engine exhaust denitration catalyst
  • Preparation method of diesel engine exhaust denitration catalyst

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preparation example Construction

[0029] The preparation process of ship denitrification catalyst is as follows: figure 1 As shown, it mainly includes: modifying titanium dioxide with tungsten source solution, vanadium source, cerium source and manganese source solution to obtain titanium-based active powder; adding clay as a plasticizer to the active powder to obtain extruded dry powder; Extrude dry powder, glass fiber, aluminum glue dry powder, copper-based molecular sieve, calcium lignosulfonate, stearic acid and an appropriate amount of deionized water to prepare mud through the shearing action of the mixer; use mud to add vacuum extruder Carry out extrusion molding to obtain the honeycomb denitration catalyst body; use the honeycomb denitration catalyst body to place in a steam drying furnace to dry along the direction of the honeycomb denitration catalyst channel; put the dried product into an electric furnace for roasting to obtain ship denitration catalyst.

[0030] Compared with the traditional catal...

Embodiment 1

[0033] (1) Titanium dioxide is added to the mixed solution of deionized water and PEG (molecular weight is about 1500g / mol), after fully stirring, ammonium metatungstate aqueous solution (5wt%) is added to prepare the first suspension, and the obtained After the first suspension was dried at 100°C for 22 hours and calcined at 550°C for 8 hours, tungsten-modified titanium dioxide was obtained; the obtained tungsten-modified titanium dioxide was added to the mixture of deionized water and PEG1500, stirred thoroughly, and then added The mixed aqueous solution of ammonium vanadate, cerium nitrate and manganese nitrate (concentrations are respectively: 4wt%, 3wt%, 2wt%) is prepared into the second suspension, and the obtained second suspension is dried at 90°C for 20 hours, and then dried at 500°C Calcined for 7.5 hours to obtain titanium-based active powder.

[0034] Titanium dioxide is commercially available titanium dioxide with a specific surface area of ​​120m 2 / g, the media...

Embodiment 2

[0043] (1) Add titanium dioxide to the mixed solution of deionized water and PEG (molecular weight is about 1500g / mol), after fully stirring, add ammonium paratungstate aqueous solution (4wt%) to prepare the first suspension, and the obtained first suspension The solution was dried at 80°C for 30 hours and calcined at 450°C for 10 hours to obtain tungsten-modified titanium dioxide. After stirring, add a mixed aqueous solution of ammonium metavanadate, cerium sulfate and manganese acetate (concentrations are respectively: 3wt%, 3wt%, 1wt%) to prepare the second suspension, and the obtained second suspension is heated at 70°C Drying for 26 hours and calcining at 420° C. for 5.5 hours gave titanium-based active powder.

[0044] Titanium dioxide is commercially available titanium dioxide with a specific surface area of ​​140m 2 / g, the median particle size is 0.8μm, and the grain size is 8nm.

[0045] The weight ratio of titanium dioxide, deionized water and PEG in the process o...

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Abstract

The invention provides a preparation method of a diesel engine exhaust denitration catalyst. The method consists of: adding a tungsten source aqueous solution into a mixed solution of titanium dioxide, deionized water and PEG to prepare a first suspension, drying and roasting the suspension to obtain tungsten modified titanium dioxide; adding a mixed aqueous solution of vanadium source, cerium source and manganese source into a mixed solution of the tungsten modified titanium dioxide, deionized water and PEG to prepare a second suspension, and drying and roasting the second suspension to obtain titanium based reactive powder; mixing clay with the titanium based reactive powder to obtain extruded dry powder; and carrying out shear mixing on the extruded dry powder, glass fiber, alumina gel dry powder, a copper based molecular sieve, calcium lignosulphonate, stearic acid and deionized water to obtain blank mud; and conducting vacuum extrusion, drying and roasting on the blank mud so as to obtain the diesel engine exhaust denitration catalyst.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, in particular to a preparation method of a denitration catalyst suitable for diesel engines. Background technique [0002] With the deterioration of environmental quality, the limit value of exhaust pollution from mobile sources such as vehicles and ships has become increasingly strict, especially nitrogen oxides (NOx), which is one of the overall environmental quality evaluation indicators. X ). Studies have shown that NO emissions from ships X It accounts for 14-15% of the world's total emissions, and it may be higher in specific areas. It will not only cause acid rain, photochemical smog and other problems that damage the earth's ecological environment, but also seriously endanger human health. Therefore, how to effectively remove nitrogen oxides has become an important topic of concern in the field of environmental protection. Ammonia selective catalytic reduction (selective ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01D53/94B01D53/56
CPCB01D53/9413B01J23/34B01J29/46B01J29/48B01D2255/2065B01D2255/20723B01D2255/2073B01D2255/504B01D2255/20776B01J2229/20B01J35/19
Inventor 施雅琼
Owner 上海净球环保科技有限公司
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