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Method for coating Ti-based denitration catalyst on honeycomb ceramic

The technology of denitration catalyst and honeycomb ceramics is applied in the field of preparation of coated ceramic honeycomb denitration catalyst, which can solve the problems of cumbersome and complicated processes, and achieve the effects of simple process, improved loading rate and cost reduction.

Active Publication Date: 2014-12-03
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method includes Al 2 o 3 Slurry preparation and coating, TiO 2 The preparation and coating of the slurry and the preparation and coating of the active component impregnation solution are cumbersome and complicated

Method used

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  • Method for coating Ti-based denitration catalyst on honeycomb ceramic
  • Method for coating Ti-based denitration catalyst on honeycomb ceramic
  • Method for coating Ti-based denitration catalyst on honeycomb ceramic

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preparation example Construction

[0029] The preparation of the catalyst is not an innovative point of the present invention. Those skilled in the art can prepare the required Ti-based denitration catalyst according to the method disclosed in the prior art according to the need, or purchase the required Ti-based denitration catalyst on the market. Below only with V 2 o 5 -WO 3 / TiO 2 Catalyst and the amorphous composite oxide denitration catalyst (CeTiO x ) as an example to illustrate the coating method of the present invention.

[0030] In the coating method of the automobile exhaust gas purification catalyst provided by the invention, the coating effect is evaluated by ultrasonic cleaning experiments. The method is to use an analytical balance to weigh the catalyst-coated carrier, immerse it in deionized water and ultrasonically sound for 10 min, take it out, blow off the residual liquid in the hole, dry it at 100 ° C, roast at 500 ° C for 2 h, and then use Analytical balance weighs the weight of the ca...

Embodiment 1

[0032] Weigh 6.08 g oxalic acid, 12.77 g ammonium tungstate (in WO 3 accounted for 10% of the total catalyst content) was dissolved in 150 ml deionized water, and stirred thoroughly to obtain a salt solution. Add 100 g of anatase titanium dioxide to the salt solution, and evaporate to dryness in an oil bath at 75°C. Drying overnight at 100°C and calcination at 500°C for 2 h yielded 10% WO 3 / TiO 2 powder catalyst. Grind and sieve the catalyst into a powder larger than 80 mesh, and weigh it.

[0033] According to the 10% WO obtained above 3 / TiO 2 Powder catalyst, weigh a certain amount of ammonium metavanadate (in V 2 o 5 Accounting for 1% of the total catalyst content) and oxalic acid, dissolved in 150 ml deionized water. After complete dissolution, add the prepared 10% WO 3 / TiO 2 The powder catalyst was evaporated to dryness in an oil bath at 75°C. Dry overnight at 100°C and bake at 500°C for 2 h to obtain 1% V 2 o 5 / 10% WO 3 / TiO 2 catalyst. Grind and siev...

Embodiment 2

[0039] Weigh 3.04 g oxalic acid, 6.39 g ammonium tungstate (in WO 3 Accounting for 5% of the total catalyst content) was dissolved in 150 ml of deionized water and stirred thoroughly to obtain a salt solution. Add 100 g of anatase titanium dioxide to the salt solution, and evaporate to dryness in an oil bath at 75 °C. Drying overnight at 100 °C and calcination at 500 °C for 2 hours yielded 5% WO 3 / TiO 2 powder catalyst. The catalyst is ground and sieved into a powder larger than 80 mesh.

[0040] Based on the 5%WO obtained above 3 / TiO 2 powder catalyst, weigh a certain amount of ammonium metavanadate (in V 2 o 5 Accounting for 1% of the total catalyst content) and oxalic acid, dissolved in 150 ml deionized water. After complete dissolution, add the prepared 5% WO 3 / TiO 2 The powder catalyst was evaporated to dryness in an oil bath at 75 °C. Dry overnight at 100 °C and bake at 500 °C for 2 h to obtain 1% V 2 o 5 / 5%WO 3 / TiO 2 catalyst. Grind and sieve the ca...

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Abstract

The invention provides a method for coating a Ti-based denitration catalyst on a honeycomb ceramic. The method comprises the following steps of: taking a Ti-based denitration catalyst slurry with the solid content of 15-40 percent by weight; regulating a pH value of the slurry to 7-10 for later use; soaking the honeycomb ceramic into the slurry; coating the catalyst on the honeycomb ceramic in an ultrasonic impregnation method or a vacuum coating method; and drying and roasting the honeycomb ceramic to obtain a coating type honeycomb ceramic Ti-based denitration catalyst. By the method for coating the Ti-based denitration catalyst, any binding agent and surfactant are not added, and the aims of high loading rate and the dropping rate of the catalyst are fulfilled through cooperation of the pH and the solid content of the catalyst slurry; and the method is simple in process, the catalyst and the honeycomb ceramic are firmly bound, the coating is uniform, the service life of the catalyst is long, the production cost is reduced, and industrialization is easy to realize.

Description

technical field [0001] The invention relates to a method for preparing a coated ceramic honeycomb denitration catalyst, in particular to a method for coating a Ti-based denitration catalyst on a honeycomb ceramic carrier. Background technique [0002] NO x It is the main pollutant that causes acid rain, photochemical smog and the destruction of the atmospheric ozone layer. Its emissions mainly come from stationary sources such as coal-fired boilers and industrial furnaces and mobile sources such as motor vehicle exhaust. My country is getting on SO 2 After the phased results of the control, during the "Twelfth Five-Year Plan" period, the NO x Realize total control. In particular, the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB 13223-2011) implemented in 2012 requires NO x (with NO 2 meter) emission is 100 mg / m 3 . at low NO x When in-furnace denitrification technologies such as combustion can no longer meet the increasingly stringent emission r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J23/10B01J35/04
Inventor 张昭良谷华春李倩赵亭亭辛颖李萍
Owner UNIV OF JINAN
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