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Denitration catalyst carried by CeO2 nanotube and preparation method of denitration catalyst

A denitrification catalyst and nanotube technology, applied in the field of selective catalytic reduction denitrification catalyst and its preparation, can solve the problems of limited anti-poisoning performance, achieve good water resistance and anti-sulfur performance, prolong service life, and low sulfur dioxide oxidation rate.

Active Publication Date: 2016-07-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing SCR decatalysts have limited anti-poisoning properties against alkali metals, alkaline earth metals, heavy metal oxides, and phosphates.

Method used

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  • Denitration catalyst carried by CeO2 nanotube and preparation method of denitration catalyst
  • Denitration catalyst carried by CeO2 nanotube and preparation method of denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of ceria-titanium nanotubes: The molar ratio of raw materials is CeCl 3 ·7H 2 O: water: sodium hydroxide = 1:70:30. Sodium hydroxide was dissolved in deionized water to prepare a strong alkali solution, and at the same time, high-purity He gas was used to purify it for 1 hour to remove dissolved oxygen to ensure an oxygen-free solution environment, and then CeCl 3 ·7H 2 O was added to the strong alkali solution, sealed and stirred for 2 hours, then poured into a polytetrafluoro-lined hydrothermal kettle at 120°C for 24 hours, and the filling degree of the hydrothermal kettle was 70%. Wash the sample with ionized water until the pH value is 6.5. The deionized water used for washing should also ensure no dissolved oxygen, and then dry the sample at 60°C. The surface morphology of ceria-titanium nanotubes is shown in figure 1 .

[0048] Preparation of the catalyst: Dissolve 2 grams of sodium polyacrylate in 80 milliliters of deionized water, then add 2 gra...

Embodiment 2

[0052] Preparation of cerium oxide nanotubes: The molar ratio of raw materials is CeCl 3 ·7H 2 O: water: potassium hydroxide = 1:150:50. Dissolve potassium hydroxide in water to prepare a strong alkali solution, and use high-purity He gas to purify it for 2 hours to remove dissolved oxygen to ensure an oxygen-free solution environment, and then add CeCl 3 ·7H 2 O was added to the strong alkali solution, sealed and stirred for 6 hours, then poured into a polytetrafluoro-lined hydrothermal kettle at 150°C for 48 hours, and the filling degree of the hydrothermal kettle was 75%. Wash the sample with ionized water until the pH value is 6.5. The deionized water used for washing should also ensure no dissolved oxygen, and then dry the sample at 60°C.

[0053] Catalyst preparation: Dissolve 2 grams of polyacrylamide in 80 milliliters of deionized water, then add 4 grams of cerium oxide nanotubes into it for ultrasonic (40KHz) dispersion for 2 hours, then add 1 gram of copper sulfat...

Embodiment 3

[0057] Preparation of cerium oxide nanotubes: The molar ratio of raw materials is Ce(NO 3 ) 3 ·6H 2 O: water: sodium hydroxide = 1:100:40. Dissolve sodium hydroxide in water to prepare a strong alkali solution, purify it with He gas for 1 hour to remove the dissolved oxygen in it to ensure an oxygen-free solution environment, and then add Ce(NO 3 ) 3 ·6H 2 O was added to the strong alkali solution, sealed and stirred for 2 hours, then poured into a polytetrafluoro-lined hydrothermal kettle at 150°C for 36 hours, and the filling degree of the hydrothermal kettle was 70%. Wash the sample with ionized water until the pH value is 7. The deionized water used for washing should also ensure no dissolved oxygen, and then dry the sample at 80°C.

[0058] Preparation of the catalyst: Dissolve 2 grams of sodium polystyrene sulfonate in 80 ml of deionized water, then add 2 grams of cerium oxide nanotubes and 2 grams of ammonium tungstate to it for ultrasonic (40KHz) dispersion for 1 ...

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Abstract

The invention discloses a denitration catalyst carried by a CeO2 nanotube. A cerium oxide nanotube is used as a carrier, and a metallic oxide is carried on the carrier. The invention further discloses a preparation method of the denitration catalyst. The preparation method comprises the following steps: step (1), performing hydrothermal treatment on Ce salt and alkali under the oxygen-free condition, after the hydrothermal treatment, filtering, washing filter cakes, and drying so as to obtain the cerium oxide nanotube; step (2), mixing the cerium oxide nanotube with an active substance precursor compound, a cocatalyst precursor compound, a flocculant and a regulator for reaction, after completion of reaction, filtering, drying filter cakes, and performing calcining treatment so as to obtain the denitration catalyst. The denitration catalyst has favorable catalytic performance, favorable alkali metal poisoning resistance, favorable alkaline-earth metal poisoning resistance, favorable heavy metal poisoning resistance and favorable phosphate poisoning resistance.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a selective catalytic reduction denitrification catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants discharged into the atmosphere by human activities at present, NO in the atmosphere x emissions have caused great harm to humans and the environment. NO x It mainly comes from the fuel combustion process and various industrial production processes, mainly including flue gas from coal-fired power plants, industrial boilers / furnaces and automobile exhaust, among which the NO produced by coal-fired x It accounts for about 70% of my country's total stationary source emissions. [0003] In recent years, in order to effectively control the emission of nitrogen oxides from stationary sources in my country, the emission standards of nitrogen oxides have become increasingly strict, and cleaning plan...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J23/34B01J23/83B01J23/888
CPCB01J23/002B01J23/28B01J23/34B01J23/83B01J23/888B01J2523/00B01J2523/3712B01J2523/55B01J2523/68B01J2523/47B01J2523/69B01J2523/72B01J2523/67B01J2523/845
Inventor 吴忠标王芃芦王海强陈思
Owner ZHEJIANG UNIV
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