Ship diesel engine gas exhaust denitration catalyst preparation method

A technology of denitrification catalyst and marine diesel engine, which is applied in the field of denitrification catalyst, can solve the problems of inability to adapt to various working conditions, low denitrification efficiency, and short service life of denitrification catalyst, so as to improve system integration, improve denitrification efficiency, and reduce treatment costs Effect

Inactive Publication Date: 2015-03-18
SHANGHAI LANGT AUTOCATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the short service life of the denitrification catalyst prepared by the prior art, it cannot adapt to various working conditions, especially the defect of low denitrification efficien

Method used

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  • Ship diesel engine gas exhaust denitration catalyst preparation method
  • Ship diesel engine gas exhaust denitration catalyst preparation method
  • Ship diesel engine gas exhaust denitration catalyst preparation method

Examples

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preparation example Construction

[0056] The preparation process of ship denitrification catalyst is as follows: figure 1 As shown, it mainly includes: modifying titanium dioxide with 5% ammonium metatungstate and 0.41% ammonium metavanadate by mass to obtain active powder; adding pyrophyllite as a plasticizer to the active powder to obtain extruded dry powder ;Use extruded dry powder, aluminosilicate glass, aluminum glue, 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 extrusion The honeycomb denitration catalyst body is obtained by extruding from the machine; the honeycomb denitration catalyst body is placed in a steam drying furnace for drying along the direction of the honeycomb denitration catalyst channel; the dried product is placed in an electric furnace for roasting and activation, etc. step.

[0057] The active ingredient of the catalyst V 2 o 5 、WO 3 The ...

Embodiment 1

[0076] Preparation of active powder:

[0077] Step A: primary modification to prepare titanium tungsten powder, including the following sequential steps:

[0078] Take ammonium metatungstate and titanium dioxide with a mass ratio of 8:92;

[0079] Add ammonium metatungstate as a primary modifier to deionized water to prepare ammonium metatungstate solution with a concentration of 5% by mass;

[0080] Add citric acid as a solubilizing dispersant to the ammonium metatungstate solution, wherein the amount of citric acid added is 1% of the mass of the ammonium metatungstate aqueous solution to obtain a mixed solution;

[0081] Add titanium dioxide into the mixed solution, and after stirring, prepare the first suspension, wherein the stirring speed is 100r / min;

[0082] Then the first suspension is dried and roasted to obtain titanium tungsten powder, wherein the drying temperature is 90°C, the drying time is 15h, the roasting temperature is 600°C, and the roasting time is 16h; ...

Embodiment 2

[0107] Preparation of active powder:

[0108] Step A: primary modification to prepare titanium tungsten powder, including the following sequential steps:

[0109] Take ammonium metatungstate and titanium dioxide with a mass ratio of 10:90;

[0110] Add ammonium metatungstate as a primary modifier to deionized water to prepare ammonium metatungstate solution with a concentration of 3% by mass;

[0111] Add citric acid as a solubilizing dispersant to the ammonium metatungstate solution, wherein the amount of citric acid added is 0.6% of the mass of the ammonium metatungstate aqueous solution to obtain a mixed solution;

[0112] Add titanium dioxide into the mixed solution, and after stirring, prepare the first suspension, wherein the stirring speed is 70r / min;

[0113] Then the first suspension is dried and roasted to obtain titanium tungsten powder, wherein the drying temperature is 80°C, the drying time is 13h, the roasting temperature is 580°C, and the roasting time is 14h;...

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Abstract

The invention relates to a ship diesel engine gas exhaust denitration catalyst preparation method, and belongs to the technical field of denitration catalysts. In the prior art, the denitration catalyst has the short service life and can not meet the denitration requirement under the low rotation speed of the ship diesel engine. With the ship diesel engine gas exhaust denitration catalyst preparation method of the present invention, the problems in the prior art can be solved. According to the present invention, pyrophyllite is adopted as a plasticizer and is added to active powder so as to obtain extruded dry powder, the extruded dry powder, Al-Si glass, an aluminum gel, a copper base molecular sieve, calcium lignosulfonate, stearic acid and a proper amount of deionized water are subjected to a shearing effect to prepare a pug, the pug is subjected to vacuum extruding to obtain a honeycomb-like denitration catalyst green body, and drying and calcination are performed to obtain the finished product, wherein the finished product has characteristics of high NOx harmful gas removal rate and high denitration efficiency.

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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IPC IPC(8): B01J29/48B01D53/94B01D53/56
Inventor 张现龙姜瑞霞焦雪静张蓓周坚刚
Owner SHANGHAI LANGT AUTOCATALYST
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