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Method for preparing titanium dioxide product for high-specific surface area denitrating catalyst

A technology of denitration catalyst and high specific surface area, applied in the directions of titanium dioxide, catalyst carrier, chemical instruments and methods, etc., can solve the problems of inability to obtain high-performance titanium dioxide products, difficult environmental protection treatment, complicated treatment process, etc., and achieve high specific surface area of ​​products. , Improve the surface chemical activity, the effect of simple process

Inactive Publication Date: 2011-08-31
四川华铁钒钛科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Method 1 is to modify the metatitanic acid by adding ammonia water, which can improve the calcination performance of metatitanic acid and obtain a relatively loose calcined product. However, the treatment process of metatitanic acid is relatively complicated in this method, and a large amount of ammonia water is used. The manufacturing cost of the product is high, and the subsequent environmental protection treatment after using ammonia water is difficult, and the environmental protection pressure is also relatively high; method 2 does not modify the metatitanic acid, and controls a certain grain size by controlling the calcination temperature of the metatitanic acid Titanium dioxide products, high performance titanium dioxide products cannot be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 10Kg metatitanic acid (by TiO 2 Add a certain amount of deionized water to the reactor with a stirring device to adjust the concentration of the slurry to 10-20wt%; after stirring evenly, add 2.0wt% (relative to the weight of titanium dioxide) Tween 80 to the slurry , after fully stirring and filtering, the filter cake is dried at 120°C, and the dried filter cake is calcined at 200°C to 480°C for 5 hours, of which 200°C to 350°C for 2.5 hours, 350°C to 400°C for 1.0 hour, 400℃~480℃ for 1.5 hours, crush the calcined material to prepare a powdered titanium dioxide product. The X-ray diffraction method shows that the crystallite size of the anatase crystal (101) surface is 13nm; BET method The specific surface area of ​​titanium dioxide powder is 113m 2 / g.

Embodiment 2

[0025] Weigh 10Kg metatitanic acid (by TiO 2 ) into a reactor with a stirring device, add a certain amount of deionized water, and adjust the slurry concentration to 20-30wt%; after stirring evenly, add 0.8wt% (relative to the weight of titanium dioxide) OP emulsifier in the slurry , after fully stirring and filtering, the filter cake is dried at 120°C, and the dried filter cake is calcined at 200°C to 500°C for 5 hours, of which 200°C to 350°C for 2.5 hours, 350°C to 400°C for 1.0 hour, 400°C-500°C for 1.5 hours, crush the calcined material to prepare a powdered titanium dioxide product. The X-ray diffraction method shows that the crystallite size of the anatase crystal (101) surface is 14nm; BET method The specific surface area of ​​titanium dioxide powder is 102m 2 / g.

Embodiment 3

[0027] Weigh 10Kg metatitanic acid (by TiO 2 ) into a reactor with a stirring device, add a certain amount of deionized water, and adjust the slurry concentration to 18-20wt%; after stirring evenly, add 1.0wt% (relative to the weight of titanium dioxide) Tween 80 to the slurry , then add 3.0wt% water-soluble silicone oil JT-708, filter after thorough stirring, dry the filter cake at 120°C, and calcinate the dried filter cake at 200°C-480°C for 5 hours, of which °C for 2.5 hours, 350°C to 400°C for 1.0 hour, 400°C to 480°C for 1.5 hours, pulverize the calcined material to prepare a powdered titanium dioxide product, determined by X-ray diffraction method, anatase crystal (101) The crystallite particle size of the surface is 11nm; the specific surface area of ​​titanium dioxide powder measured by BET method is 121m 2 / g.

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Abstract

The invention relates to a method for preparing titania raw materials with high specific surface area used by denitration catalyst, which relates to the chemical product preparation technical field. The method comprises the following steps that: a metatitanic acid produced by adoption of the sulfuric acid method is processed by an organic surfactant and then modified so as to reduce the viscosityof the metatitanic acid; and loose titania products with high specific surface area and high surface chemical activity used by the denitration catalyst are prepared through filtration and calcinationof the processed metatitanic acid. The method has a simple technique for processing the metatitanic acid and has low cost; and added organic substances are fully decomposed during the calcining stage, thereby impurities can not be brought into the final products and the environmental pollution can not be caused.

Description

technical field [0001] The invention relates to the technical field of chemical product preparation, in particular to a method for preparing a titanium dioxide product applied to a denitration catalyst and having a high specific surface area. Background technique [0002] Nitrogen oxides are one of the main air pollutants and important precursors for inducing photochemical smog and acid rain. Flue gas denitrification is another key area for the state to control pollutant emissions from thermal power plants after flue gas desulfurization. The denitrification catalyst is used to control the nitrogen oxides emitted by coal-fired and other thermal power plants to improve air quality and control acid rain pollution. The denitrification catalyst mainly uses ultra-fine-grained titanium dioxide as the active carrier, uses the oxides of vanadium and tungsten as the catalytic active components, and reduces the nitrogen oxides into nitrogen and water through ammonia. The specific surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/08B01J21/06B01J32/00B01J35/10B01D53/56
Inventor 李建彬鲁东胡新平
Owner 四川华铁钒钛科技股份有限公司
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