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Preparation method of special titanium-tungsten powder for SCR (selective catalytic reduction) denitrification catalyst

A technology of denitrification catalyst and titanium tungsten powder, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems that restrict the development of denitrification environmental protection industry, the catalyst is not acclimatized, and the coal quality is uneven, so as to promote the industry. The effects of upgrading, broadening the industrial chain, and low manufacturing costs

Inactive Publication Date: 2014-09-10
CHONGQING PUYUAN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the nano-titanium tungsten powders currently used to prepare denitrification catalysts are imported from abroad, which not only wastes a lot of foreign exchange but also seriously restricts the development of the denitrification environmental protection industry.
At the same time, due to the constraints of many objective factors such as resource characteristics and contradictions between supply and demand, the quality of coal used in domestic coal-fired power stations is uneven, resulting in flue gas conditions such as NOx, SO 2 , ash content and other indicators are also more stringent, and the catalyst prepared by using imported nano-titanium tungsten powder appears "acclimatized" phenomenon

Method used

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  • Preparation method of special titanium-tungsten powder for SCR (selective catalytic reduction) denitrification catalyst
  • Preparation method of special titanium-tungsten powder for SCR (selective catalytic reduction) denitrification catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh 10kg metatitanic acid (equivalent to TiO 2 In total, the raw material TiO 2 The content is about 28%), placed in a reactor equipped with a stirrer, and about 31kg of deionized water was added to make the slurry TiO 2 The content is about 15%, stir for 1 hour; add ammonia water to the slurry to adjust the pH value to 6, heat the slurry to 80°C with steam, keep warm and stir for 2 hours, and add ammonia water in an appropriate amount to maintain the pH of the slurry at 6; weigh 0.58kg Ammonium metatungstate (WO in ammonium metatungstate 3 content of about 91%) was dissolved in 5kg of hot deionized water at a temperature of 80°C, and stirred for 1 hour with a stirrer; the prepared ammonium metatungstate solution was added to the aforementioned metatitanic acid slurry with a pH value of 6 and fully dispersed, Stir for 1 hour; press filter the slurry to a massive filter cake with a solid content of about 40%; chop the filter cake into small pieces and calcinate it fo...

Embodiment 2

[0029] Weigh 10kg metatitanic acid (equivalent to TiO 2 In total, the raw material TiO 2 The content is about 28%), placed in a reactor equipped with a stirrer, and about 65kg of deionized water was added to make the slurry TiO 2 The content is about 10%, stir for 1 hour; add ammonia water to the slurry to adjust the pH value to 7, heat the slurry to 85°C with steam, keep warm and stir for 2 hours, and add ammonia water in an appropriate amount to maintain the pH value of the slurry at 7; weigh 0.58kg Ammonium metatungstate (WO in ammonium metatungstate 3 content of about 91%) was dissolved in 5 kg of hot deionized water at a temperature of 80°C, and stirred for 1 hour with a stirrer; the prepared ammonium metatungstate solution was added to the aforementioned metatitanic acid slurry with a pH value of 7 and fully dispersed, Stir for 1 hour; press filter the slurry to a cake with a solid content of about 45%; chop the filter cake into small pieces and calcinate it for 2 hour...

Embodiment 3

[0031] Weigh 10kg metatitanic acid (equivalent to TiO 2 In total, the raw material TiO 2 The content is about 28%), placed in a reactor equipped with a stirrer, and about 65kg of deionized water was added to make the slurry TiO 2 The content is about 10%, stir for 1 hour; add ammonium bicarbonate to the slurry to adjust the pH value to 7, heat the slurry to 80°C with steam, keep it warm and stir for 2 hours, and at the same time add an appropriate amount of ammonium bicarbonate to maintain the pH of the slurry at 7; Weigh 0.58kg ammonium metatungstate (WO in ammonium metatungstate 3 content of about 91%) was dissolved in 5kg of hot deionized water at a temperature of 85°C, and stirred for 1 hour with a stirrer; the prepared ammonium metatungstate solution was added to the aforementioned metatitanic acid slurry with a pH value of 7 and fully dispersed, Stir for 1 hour; press filter the slurry to a massive filter cake with a solid content of about 45%; chop the filter cake int...

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Abstract

The invention provides a preparation method of special titanium-tungsten powder for an SCR (selective catalytic reduction) denitrification catalyst, and relates to the field of the preparation of an inorganic chemical material. The preparation method comprises the following process steps: by using intermediate metatitanic acid in the preparation of titanium white through a sulfuric acid method as the raw material, beating, dispersing, performing pressure filtration, dicing, calcining, and crushing to obtain the high-quality nano titanium-tungsten powder. Compared with the prior art, the invention has the following beneficial effects: an SCR denitrification catalyst prepared from the titanium-tungsten powder is more suitable for strict flue gas conditions in China; and for flue gas characteristics of thermal power plants in China, the SCR denitrification catalyst has higher applicability and higher denitrification efficiency. Meanwhile, the titanium-tungsten powder production process is reliable, the product quality is stable, the cost is relatively low, and the manufacturing cost of the denitrification catalyst is greatly reduced.

Description

technical field [0001] The invention relates to a preparation method of inorganic chemical materials, in particular to a preparation method of titanium-tungsten powder specially used for SCR denitration catalysts. Background technique [0002] Nitrogen oxide (NOx) is one of the main air pollutants and an important precursor for inducing photochemical smog and acid rain. It is imperative to establish a low-carbon and environment-friendly economic development mode. Among them, flue gas from coal-fired power stations and industrial boilers is the largest source of NOx, accounting for about 60% of the total NOx emissions. The draft of the national "Twelfth Five-Year Plan" clearly listed NOx emissions as a binding indicator. ) has more stringent requirements on the implementation time of thermal power plant denitrification and NOx emission standards, and clearly requires that the nitrogen oxide emission of new and existing thermal power plants be controlled at 100mg / Nm 3 within...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/053B01D53/90B01D53/56
Inventor 邱赟曾凡阳梁功伟徐鸿巫星蓉陈晓民秦剑锋鲁谦怀廖红艳
Owner CHONGQING PUYUAN CHEM IND
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