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Titanium dioxide powder containing tungsten for preparing honeycomb SCR DeNOx catalyst and preparation method thereof

A denitration catalyst, titanium dioxide technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as inability to prepare, and achieve improved thermal stability. Effect

Inactive Publication Date: 2010-06-30
河北晶锐瓷业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In China, not only do not have titanium-tungsten composite out-of-stock powder, but they are not even able to prepare ordinary anatase-type titanium dioxide powder suitable for honeycomb extrusion.

Method used

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  • Titanium dioxide powder containing tungsten for preparing honeycomb SCR DeNOx catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation of metatitanic acid slurry A

[0026] The intermediate metatitanic acid prepared by the sulfuric acid method is selected, and the metatitanic acid is commercially available, which can shorten the process flow. Metatitanic acid is preferably washed. In this way, metatitanic acid can be made into slurry A.

[0027] To measure the solid content of metatitanic acid, add 88L deionized water into a stirring tank equipped with a stirrer. Weigh 35.2 kg of metatitanic acid (dry basis), add it into a stirring tank, and stir for 60 minutes to prepare metatitanic acid slurry A with a slurry concentration of 400 g / L.

[0028] 2. Preparation of tungsten solution B

[0029] Add 12L of deionized water at a temperature of 40-65°C to another dissolving tank, then take 5.28kg of high-grade pure ammonium paratungstate, and add it into the dissolving tank while stirring. Stir to obtain tungsten solution B whose concentration of tungsten solution is 440g / L.

[0030] 3. Mi...

Embodiment 2

[0042] 1. Preparation of metatitanic acid slurry A

[0043] The intermediate metatitanic acid prepared by the sulfuric acid method is selected, and the metatitanic acid is commercially available, which can shorten the process flow. Metatitanic acid is preferably washed. In this way, metatitanic acid can be made into slurry A.

[0044] To measure the solid content of metatitanic acid, add 90L deionized water into a stirring tank equipped with a stirrer. Weigh 36.0 kg of metatitanic acid (dry basis), add it into a stirring tank, and stir for 60 minutes to prepare metatitanic acid slurry A with a slurry concentration of 400 g / L.

[0045] 2. Preparation of tungsten solution B

[0046] Add 10L of deionized water at a temperature of 40-65°C into another dissolving tank, then take 4.40 kg of superior pure ammonium paratungstate, and add it into the dissolving tank while stirring. Stir to obtain the tungsten solution B whose concentration of the tungsten solution is 440g / L.

[00...

Embodiment 3

[0059] 1. Preparation of metatitanic acid slurry A

[0060] The intermediate metatitanic acid prepared by the sulfuric acid method is selected, and the metatitanic acid is commercially available, which can shorten the process flow. Metatitanic acid is preferably washed. In this way, metatitanic acid can be made into slurry A.

[0061] To measure the solid content of metatitanic acid, add 92L of deionized water into a stirring tank equipped with a stirrer. Weigh 36.8 kg of metatitanic acid (dry basis), add it into a stirring tank, and stir for 60 minutes to prepare metatitanic acid slurry A with a slurry concentration of 400 g / L.

[0062] 2. Preparation of tungsten solution B

[0063] Add 8L of deionized water at a temperature of 40-65°C to another dissolving tank, then take 3.52 kg of high-grade pure ammonium paratungstate, and add it into the dissolving tank while stirring. Stir to obtain the tungsten solution B whose concentration of the tungsten solution is 440g / L.

[...

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Abstract

The invention relates to titanium dioxide powder containing tungsten for honeycomb SCR DeNOx catalyst and a preparation method thereof; the powder is characterized by comprising anatase crystal and TiO2-WO3 two components, and containing 85 to 95 percent of TiO2. and 5 to 15 percent of WO3.; the preparation method comprises the following steps that: intermediate metatitanic which is used to prepare anatase titanium dioxide through a sulfuric acid method is prepared into serum, the content of titanium dioxide is 200 to 800g / L, and serum A is prepared; simultaneously, tungsten is dissolved into deionized water, the content of tungsten is 440g / L, and serum B is prepared; and then the serum B is calculated and added into the serum A, ammonia is used to regulate the pH value to be 8; and titanium tungsten composite denitrification powder is prepared after spray drying and calcining for 3 to 7 hours at 300DEG C to 550DEG C.

Description

technical field [0001] The invention belongs to the field of environmental protection, and more specifically belongs to the scope of preparation of raw materials for catalysts for removal of nitrogen oxides Background technique [0002] With the strengthening of environmental protection technology, the emission of soot and sulfur dioxide has been better curbed. However, as the root cause of acid rain, photochemical smog, and greenhouse gases, the harm of nitrogen oxides to the environment is prominent. At present, the mainstream for the removal of nitrogen oxides from stationary sources and post-combustion is selective catalytic reduction (SCR) technology. The core of selective catalytic reduction (SCR) technology is the catalyst, and the catalyst is divided into honeycomb and corrugated plate. The honeycomb SCR catalyst is preferred because of its higher thermal stability and better anti-poisoning ability. [0003] The honeycomb SCR out-of-stock catalyst generally uses a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J21/06B01J35/04B01D53/56
Inventor 何冬青孙海军赵晓林马少丹
Owner 河北晶锐瓷业有限公司
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