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Preparation method for titanium dioxide group catalyst carrier

A technology of titanium dioxide and carrier, which is applied in the field of preparation of titanium dioxide-based catalyst carrier, which can solve the problems of reduced mechanical strength of catalyst carrier and unfavorable catalyst life.

Inactive Publication Date: 2009-08-26
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existence of sulfate radicals will lead to the gradual sulfation of the shaped binder during the use of the catalyst, thereby reducing the mechanical strength of the catalyst carrier, which has a very adverse effect on the catalyst life.

Method used

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  • Preparation method for titanium dioxide group catalyst carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Take 1000g of titanium dioxide prepared in the preparation example, crush the titanium dioxide powder until the particle size is less than 325 mesh, add 230g of bentonite, 60g of sodium carboxymethyl cellulose, and 25g of aluminum stearate, mix and grind evenly, and then add 30g of Glycerin, 10g of 65% concentrated nitric acid, 300g of distilled water are mixed and kneaded into mud in a kneader. The mud is stale for 12 hours at a temperature lower than 25°C, and extruded into a cylindrical or clover-shaped mud stick with a diameter of Ф4 through an extruder. After the mud strips were left at room temperature for 12 hours, they were cut into 2mm long column grains or clover. Dry the wet support at 60°C in an air atmosphere for 12 hours, and then burn at 500°C for 6 hours to obtain the desired catalyst support. The carrier has a lateral compressive strength of ~25N / mm and a specific surface area of ​​~85m 2 / g.

Embodiment 2

[0035] Embodiment 2: get the metatitanic acid 1000g (calculated as titanium dioxide) prepared by the preparation example, the metatitanic acid powder is pulverized to a particle size less than 325 mesh, add 230g kaolin, 60g methylcellulose, 25g aluminum stearate, After mixing and grinding evenly, add 30g of glycerin, 10g of 65% concentrated nitric acid, and 250g of distilled water, and mix and knead in a kneader to form a slurry. The mud is stale for 12 hours at a temperature lower than 25°C, and extruded into a cylindrical or clover-shaped mud stick with a diameter of Ф4 through an extruder. After the mud strips were left at room temperature for 12 hours, they were cut into 2mm long column grains or clover. Dry the wet support at 60°C in an air atmosphere for 12 hours, and then burn at 500°C for 6 hours to obtain the desired catalyst support. The support has a lateral compressive strength of ~32N / mm and a specific surface area of ​​~85m 2 / g.

Embodiment 3

[0036]Example 3: Take 1000 g of titanium dioxide prepared in the preparation example, grind the titanium dioxide powder to a particle size of less than 325 mesh, add 20 g of silicon dioxide, 60 g of methyl cellulose, and 25 g of aluminum stearate, mix and grind evenly. Another 100g of pseudo-boehmite (PA98 type, produced by Jinling Petrochemical Alkylbenzene Factory) was taken, mixed with 200g of 0.5M nitric acid to form a slurry, and added to the above mixed powder. Then add 30g of glycerin, 10g of citric acid, and 100g of distilled water, mix and knead in a kneader to form a slurry. The mud is stale for 12 hours at a temperature lower than 25°C, and extruded into a cylindrical or clover-shaped mud stick with a diameter of Ф4 through an extruder. After the mud strips were left at room temperature for 12 hours, they were cut into 2mm long column grains or clover. Dry the wet support at 60°C in an air atmosphere for 12 hours, and then burn at 500°C for 6 hours to obtain the de...

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Abstract

The invention provides a preparation method for a titanium dioxide group catalyst carrier with excellent moldability, high strength and high specific surface. The method comprises the following steps: using titanium dioxide or metatitanic acid prepared by hydrolyzation and neutralization of precipitate with titanium tetrachloride as the raw material; by weight portions, mixing and grinding 60-85% of titanium dioxide or dried metatitanic acid powder (counted as titanium dioxide), 1-10% of temporary adhesive and 1-5% of pore-forming material into uniform powder; adding 5-35% of constitutive adhesive, 0.5-2% of molding adhesion promoter, 1-10% of extrusion aid and water followed by evenly mixing and making into mud; extruding for molding after the mud decays; seasoning the extrudate at room temperature; baking and dehydrating at a temperature below 80 DEG C; and then iglossing at 400-600 DEG C to obtain the titanium dioxide group carrier. After molding, the specific surface of the carrier is 80-150m / g, and the pressive strength thereof is 15-100N / mm. The carrier is mainly used for selective catalytic reduction (SCR) to remove nitrogen oxide.

Description

technical field [0001] The invention relates to a method for preparing a titanium dioxide-based catalyst carrier, in particular to a method for preparing a titanium dioxide-based catalyst carrier for selective catalytic reduction (SCR) denitrification. Background technique [0002] Nitrogen oxides (NOx) emitted from thermal power plant boiler systems, industrial furnaces and incinerators in my country x ) is the main stationary source of air pollution. my country has started to levy nitrogen oxide pollutant discharge fees on July 1, 2004, and will gradually force NOx in thermal power plant boiler systems, industrial kilns and incinerators to x Emissions up to standard. Among the current technologies for removing nitrogen oxides in combustion exhaust gas, the mainstream technology is selective catalytic reduction (SCR). composed of components. In the actual application process, the carrier or catalyst usually needs to be manufactured into a suitable geometric shape such a...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/06B01D53/56B01D53/86
Inventor 范以宁唐富顺陆海孟许波连刘冬陈懿
Owner NANJING UNIV
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