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Method for preparing wide-working-temperature denitration catalyst with metatitanic acid as raw material

A wide working temperature, denitration catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc. Limited range, difficult active components and additives, etc., to achieve the effect of strong water and SO2 resistance, easy implementation and small grain size

Active Publication Date: 2016-11-09
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to physical mixing, the dispersion of active components and catalyst additives is not uniform, and there are problems such as accumulation or embedding. It is difficult for active components and additives to work together, and the expansion of the working temperature window is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] a. Take 20g of metatitanic acid and add it to 43.2g of water, beat and disperse at room temperature, add 0.30g of ammonium citrate to the slurry to disperse, stir in a water bath at 70°C for 1 hour, gradually add ammonia water dropwise and adjust the pH value to 5. Weigh 0.32g of ammonium tungstate and 1.27g of cerium nitrate and dissolve them in 10mL of water, and add them dropwise to the above solution. Add ammonia water to adjust the pH value to 8, and prepare CeO by filtering, drying at 100°C, and roasting at 550°C for 2 hours 2 -WO 3 / TiO 2 Powder.

[0031] b. Weigh 0.13g of ammonium metavanadate and add it to 10mL of oxalic acid aqueous solution, stir in a 40°C water bath for 2h until completely dissolved, add 9.87g of the powder prepared in step a, stir, dry and roast at 600°C for 2h Prepared as V 2 o 5 -CeO 2 -WO 3 / TiO 2 catalyst. The catalyst is designated CAT-1.

Embodiment 2

[0033] a. Take 20g of metatitanic acid and add it to 35.0g of water, beat and disperse at room temperature, add 0.48g of ammonium carbonate to the slurry to disperse, stir in a water bath at 70°C for 1 hour, gradually add ammonia water dropwise and adjust the pH value to 5.5. Weigh 0.16g of ammonium paratungstate and 1.62g of cerium sulfate and dissolve them in 10mL of water, and add them dropwise to the above solution. Add ammonia to adjust the pH value to 9, and prepare CeO after filtering, drying at 100°C, and roasting at 600°C for 2 hours. 2 -WO 3 / TiO 2 Powder.

[0034] b. Weigh 0.11g of vanadium oxalate and add it to 10mL of oxalic acid aqueous solution, stir in a water bath at 40°C for 2h until it is completely dissolved, add 9.89g of the powder prepared in step a, stir, dry and roast at 600°C for 2h to prepare V 2 o 5 -CeO 2 -WO 3 / TiO 2 catalyst. The catalyst is designated CAT-2.

Embodiment 3

[0036] a. Add 20g of metatitanic acid into 49.6g of water, beat and disperse at room temperature, add 0.29g of ammonium sulfate to the slurry to disperse, stir in a water bath at 70°C for 1 hour, gradually add ammonia water dropwise and adjust the pH to 4.5. Weigh 0.50g of ammonium metatungstate and 0.64g of cerium sulfate and dissolve them in 10mL of water, and add them dropwise to the above solution. Add ammonia water to adjust the pH value to 7, and prepare CeO by filtering, drying at 80°C, and roasting at 580°C for 3 hours. 2 -WO 3 / TiO 2 Powder.

[0037] b. Weigh 0.16g of ammonium metavanadate and add it to 10mL of oxalic acid aqueous solution, stir in a water bath at 40°C for 2h until completely dissolved, add 9.84g of the powder prepared in step a, stir, dry and roast at 600°C for 2h Prepared as V 2 o 5 -CeO 2 -WO 3 / TiO 2 catalyst. The catalyst is designated CAT-3.

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Abstract

The invention discloses a method for preparing a wide-working-temperature denitration catalyst with metatitanic acid as the raw material. The method specifically includes the following steps that firstly, metatitanic acid is added into water for pulping, ammonium salt is added into the pulp and dispersed, the pH value is regulated to be 3-6 with ammonium hydroxide, cerium and tungsten precursors are added, the pH value is regulated to be 6-10 by adding ammonium hydroxide, and after filtering, drying and roasting, CeO2-WO3 / TiO2 powder is prepared; b, a vanadium precursor is dissolved in an oxalic acid aqueous solution, the CeO2-WO3 / TiO2 powder is added, stirring is carried out, and after drying and roasting, the V2O5-CeO2-WO3 / TiO2 catalyst is prepared. Compared with an existing industrial V2O5-WO3 / TiO2 catalyst, the denitration catalyst prepared through the method has the advantages of being wide in working temperature, high in denitration efficiency, high in water resistance and SO2 resistance and the like.

Description

technical field [0001] The invention relates to a method for preparing a wide working temperature denitration catalyst by using metatitanic acid as a raw material. Background technique [0002] Nitrogen oxides (NOx) can cause acid rain, photochemical smog and other pollutants that affect the environment. It is also the focus and difficulty of atmospheric environmental protection. According to incomplete statistics, more than 90% of NOx in my country's air pollutants comes from the combustion process of coal, oil, and natural gas. Among the numerous flue gas denitration technologies, SCR denitrification technology is an efficient flue gas denitrification technology. It has been used in coal-fired power plants for more than 30 years, and has the advantages of high denitrification efficiency and moderate cost. According to the catalytic reaction temperature and the type of catalyst, the SCR process is divided into three types: high temperature, medium temperature and low tem...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J23/002B01J23/30B01J2523/00B01J35/399B01J35/393B01J2523/3712B01J2523/47B01J2523/55B01J2523/69
Inventor 唐志诚杨妙之张国栋韩维亮
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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