Ceria-based denitration catalyst and preparation method thereof

A denitration catalyst and catalyst technology, which are applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of easily harming the human environment, high toxicity of precursors, and high cost, and improve the safety of use. cost, pollution reduction effect

Inactive Publication Date: 2010-06-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalyst still has the following problems: one is that the cost is higher; the other is that the active component V 2 o 5 The toxicity of the precursor is very high, it is easy to harm the human body and pollute the environment

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  • Ceria-based denitration catalyst and preparation method thereof
  • Ceria-based denitration catalyst and preparation method thereof

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preparation example Construction

[0021] The invention provides a kind of preparation method of above-mentioned catalyst, carry out according to the following steps:

[0022] Step 1: Add 1 g of oxalic acid to 40 ml of deionized water, take oxalic acid and deionized water respectively, dissolve oxalic acid in deionized water, and prepare an oxalic acid solution with a concentration of 25 g / L;

[0023] Step 2: Add 0.0563~1.1260g ammonium paratungstate to the oxalic acid solution prepared in step 1 according to the ratio of 20ml, take ammonium paratungstate and the oxalic acid solution prepared in step 1 respectively, add ammonium paratungstate to the oxalic acid solution, heat and stir in a water bath at 30~50℃ for 10~ After 30 minutes, a transparent solution was formed;

[0024] Step 3: Add 1.26 to 1.27 g of cerium nitrate to 20 ml of the oxalic acid solution prepared in step 1, respectively take cerium nitrate and the oxalic acid solution prepared in step 1, and dissolve the cerium nitrate in the oxalic acid s...

Embodiment 1

[0033] According to the ratio of adding 1g oxalic acid to 40ml deionized water, take deionized water and oxalic acid respectively, dissolve oxalic acid in deionized water to obtain an oxalic acid solution with a concentration of 25g / L; add 0.0563g ammonium paratungstate to the oxalic acid solution prepared according to 20ml Take ammonium paratungstate and the prepared oxalic acid solution respectively, add ammonium paratungstate to the oxalic acid solution, heat and stir in a water bath at 30°C for 30 minutes to form a transparent solution; Take cerium nitrate and the prepared oxalic acid solution, dissolve the cerium nitrate in the oxalic acid solution to obtain a mixed solution; respectively take the prepared transparent solution and the prepared mixed solution at a volume ratio of 1:1, and drop the mixed solution into the transparent solution and heated in a water bath at 30°C for 40 minutes to form a solution with flocculent precipitates; according to the ratio of adding 3....

Embodiment 2

[0035] According to the ratio of adding 1g oxalic acid to 40ml deionized water, take oxalic acid and deionized water respectively, dissolve oxalic acid in deionized water to obtain an oxalic acid solution with a concentration of 25g / L; add 0.3379g ammonium paratungstate to the 20ml prepared oxalic acid solution Take ammonium paratungstate and the prepared oxalic acid solution respectively, add ammonium paratungstate to the oxalic acid solution, heat and stir in a water bath at 50°C for 10 minutes to form a transparent solution; Cerium nitrate and the prepared oxalic acid solution are dissolved in the oxalic acid solution to obtain a mixed solution; the prepared transparent solution and the prepared mixed solution are respectively taken at a volume ratio of 1:1, and the mixed solution is dripped into the transparent solution, and placed in a water bath at 50°C for heating for 30 minutes to form a solution with flocculent precipitates; add 4.50 g of titanium dioxide powder to the...

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Abstract

The invention relates to a ceria-based denitration catalyst and a preparation method thereof. The catalyst takes anatase titanium dioxide as a carrier, cerium oxide as a main active component and tungsten trioxide as an auxiliary agent having the synergistic effect, and the catalyst is expressed as CeO2-WO3/TiO2. The preparation method comprises the steps of: dissolving oxalate into deionized water to prepare oxalate solution; adding ammonium paratungstate into the oxalate solution for heating in a water bath to prepare transparent solution; dissolving cerous nitrate into the oxalate solution to prepare mixed solution; dripping the mixed solution into the transparent solution to prepare solution with flocculent precipitates; adding titanium dioxide powder into the solution with the flocculent precipitates for stirring and heating in a water bath to prepare slurry; and performing ultrasonic immersing, drying and calcination on the slurry to prepare the CeO2-WO3/TiO2 catalyst. The catalyst can purify oxynitride under the high-sulfur, high-dust and high-temperature environment, and can reduce cost and improve use safety.

Description

technical field [0001] The invention belongs to the technical fields of environmental materials, environmental catalysis and environmental protection, and relates to a catalyst for treating nitrogen oxides (NOx) in waste gas discharged from stationary sources such as thermal power plants, smelters and oil refineries, and in particular to a cerium-based denitrification catalyst , The present invention also relates to a preparation method of the catalyst. Background technique [0002] With the growth of energy consumption and the rapid increase of motor vehicle ownership, a large amount of fossil fuels are consumed, resulting in the nitrogen oxides (NO X ) and other acid-causing substances continue to increase, causing great damage to the environment. Therefore, how to effectively eliminate nitrogen oxides has become an important topic of concern in the field of environmental protection. [0003] The core of ammonia selective catalytic reduction (selective catalytic reductio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/10B01D53/86B01D53/56
Inventor 李俊华陈亮郝吉明
Owner TSINGHUA UNIV
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