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Nanometer titanium dioxide powder for flue gas deodorization/denitration catalyst and preparation method and application thereof

A nano-titanium dioxide and catalyst technology, applied in the field of nano-titanium dioxide powder and its preparation, can solve the problems of unevenness, high energy consumption, large particle distribution, etc., and achieve good activity and stability, stable specific surface area, and small particle size. Effect

Active Publication Date: 2015-03-25
河北林格环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO in metatitanic acid prepared by general hydrothermal decomposition 2 The particles are large and unevenly distributed, which affects the quality of the final product; there are temperature gradients and stirring shear forces in the traditional hydrothermal synthesis heating method, resulting in wide particle size distribution and serious agglomeration; catalysts in the traditional drying and sintering process The time required for the process is long, the energy consumption is high, the crystal grains are seriously agglomerated, and the gap between the grains collapses, which has a great impact on the activity of the catalyst.

Method used

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  • Nanometer titanium dioxide powder for flue gas deodorization/denitration catalyst and preparation method and application thereof
  • Nanometer titanium dioxide powder for flue gas deodorization/denitration catalyst and preparation method and application thereof
  • Nanometer titanium dioxide powder for flue gas deodorization/denitration catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of metatitanic acid slurry

[0035] Deploy 50L titanyl sulfate or titanium sulfate hydrolyzate, which meets the following indicators: acid-titanium ratio mH 2 SO 4 / mTiO 2 2.10, iron-titanium ratio mFe / mTiO 2 is 0.4, the initial titanium concentration TiO 2 It is 1.95mol / L. Use a microwave with a power of 210W to heat and hydrolyze titanyl sulfate or titanium sulfate under the condition of 90 degrees and 1 hour. The obtained metatitanic acid is filtered and washed to < 100ppm of alkali metal ions and other heavy ions. Then add deionized water and beat to form a 30% metatitanic acid slurry.

[0036] 2. Hydrothermal synthesis

[0037] Take 50L of the above-mentioned metatitanic acid slurry, add 15% ammonia water to adjust the pH value of the slurry to 10, heat it with 210W microwave at 50°C and stir for 1 hour to fully disperse the slurry.

[0038] 3. Calcination

[0039] After the slurry in the above step 2 was sent to a membrane filter press for ...

Embodiment 2

[0041] The preparation of the metatitanic acid slurry was the same as that in Example 1, adding a weighed 8.3Kg of silica sol with a mass fraction of 20% in the metatitanic acid slurry of 50L, and then adding 15% ammonia water to adjust the pH of the slurry The value is 10, 210W microwave heating at 50 degrees and stirring for 1 hour to fully disperse the slurry. After the slurry is sent into a diaphragm filter press for pressure filtration, it is sent into a 210W microwave oven for drying at 110 degrees for 2 hours. The solid obtained by drying was sintered at a temperature of 500 degrees with a microwave of 210W for 2 hours, and then pulverized to obtain a catalyst 10% SiO 2 -90% TiO 2 Composite nano titanium dioxide powder.

Embodiment 3

[0043] The preparation of the metatitanic acid slurry is the same as that in Example 1. Add a weighed 1.87Kg of ammonium paratungstate APT to the 50L metatitanic acid slurry, then add 15% ammonia water to adjust the pH value of the slurry to 10, and a microwave oven of 210W Heat at 50°C and stir for 1 hour to fully disperse the slurry. After the slurry is sent into a diaphragm filter press for pressure filtration, it is sent into a 210W microwave oven for drying at 110 degrees for 2 hours. The solid obtained by drying was sintered at a temperature of 560 degrees with a microwave of 210W for 2 hours, and then pulverized to obtain a catalyst 10% WO 3 -90%TiO 2 Composite nano titanium dioxide powder.

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Abstract

The invention discloses nanometer titanium dioxide powder for a flue gas deodorization / denitration catalyst and a preparation method thereof. The nanometer titanium dioxide powder is prepared from the following ingredients in mass percentage: 50-100% of TiO2, 0-50% of SiO2, 0-15% of WO3 and 0-10% of V2O5; the preparation method of the nanometer titanium dioxide powder comprises the following steps: carrying out hydrolysis on titanyl sulfate or titanium sulfate used as a raw material in a microwave heating manner to obtain titanic hydroxide, filtering, washing, adding with deionized water, pulping to form 20-80% metatitanic acid slurry, adding with SiO2 sol, a V2O5 precursor-ammonium metavanadate and / or a WO3 precursor-ammonium paratungstate, adjusting the pH value to be within a range of 8-11, carrying out atmospheric-pressure microwave hydro-thermal treatment, performing filter pressing, microwave sintering and crushing to obtain the nanometer titanium dioxide powder. The invention also relates to an application of the nanometer titanium dioxide powder used as the flue gas deodorization / denitration catalyst.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical materials, and relates to a flue gas deodorization / denitration catalyst and its preparation method and application, in particular to a nano-titanium dioxide powder used as a flue gas deodorization / denitration catalyst and its preparation method and application. Background technique [0002] In environmental pollution, air pollution is a very important aspect, and nitrogen oxides (NO x ) is the main air pollutant, mainly including NO, NO 2 , N 2 O, etc., can cause acid rain, photochemical smog, greenhouse effect and the destruction of the ozone layer. NO in natural environment x 63% of pollution comes from industrial pollution and traffic pollution, which is twice that of natural sources, of which emissions from the power industry and automobile exhaust each account for 40%, and other industrial pollution sources account for 20%. At normal combustion temperatures, the NO produced by ...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J21/08B01D53/94B01D53/56B01D53/90B01D53/86B01D53/44
CPCY02A50/20
Inventor 郭燏周吕廖永涛李清陈锐杰顾欧昀曹财源陈飞
Owner 河北林格环保科技有限公司
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