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A kind of chromium-tungsten-zirconium composite oxide denitrification catalyst and its preparation method and application

A composite oxide and denitrification catalyst technology, which is applied in the field of environmental catalysis and air pollution control, can solve the problems of carrier crystal transformation, narrow operating temperature window, and high catalyst cost, so as to improve acidity, improve oxidation-reduction performance, and good denitrification active effect

Active Publication Date: 2017-10-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problems of this catalyst are high catalyst cost, narrow operating temperature window and support TiO 2 prone to crystal transformation

Method used

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  • A kind of chromium-tungsten-zirconium composite oxide denitrification catalyst and its preparation method and application
  • A kind of chromium-tungsten-zirconium composite oxide denitrification catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: 2% Cr 2 o 3 -8% WO 3 / ZrO 2 Preparation of composite oxide catalyst

[0020] a) Take 37.3mL of 1mol / L zirconium oxychloride solution, add deionized water, add ammonia water drop by drop under stirring at room temperature until the pH is 9, filter the obtained precipitate with suction, and then dry it at 120°C for 12 hours, a dry sample was prepared, and the resulting sample was ground into a powder.

[0021] b) Take 2.47mL of 0.1mol / L ammonium tungstate solution, add deionized water, stir evenly at room temperature, add the powder obtained in step a) into the solution, and stir for 2 hours to obtain a slurry;

[0022] c) Dry the slurry prepared in step b) at 120°C for 12 hours to prepare a dry sample, place the sample in a muffle furnace and bake at 800°C for 3 hours, and grind the sample after cooling into powder;

[0023] d) Take 1.34mL 1mol / L chromium nitrate solution, add deionized water, stir evenly at room temperature, add the powder obtained in s...

Embodiment 2

[0025] Example 2: 2% Cr 2 o 3 -10% WO 3 / ZrO 2 Preparation of composite oxide catalyst

[0026] a) Take 36.5mL of 1mol / L zirconium oxychloride solution, add deionized water, add ammonia water drop by drop under stirring at room temperature until the pH is 10, filter the obtained precipitate, and then dry it at 120°C for 24 hours, a dry sample was prepared, and the resulting sample was ground into a powder.

[0027] b) Take 3.08mL of 0.1mol / L ammonium tungstate solution, add deionized water, stir evenly at room temperature, add the powder obtained in step a) into the solution, and stir for 4 hours to obtain a slurry;

[0028] c) Dry the slurry prepared in step b) at 120°C for 24 hours to prepare a dry sample, place the sample in a muffle furnace and bake at 800°C for 6 hours, and grind the sample after cooling into powder;

[0029] d) Take 1.34mL 1mol / L chromium nitrate solution, add deionized water, stir evenly at room temperature, add the powder obtained in step c) into...

Embodiment 3

[0031] Example 3: 2% Cr 2 o 3 -12.5% ​​WO 3 / ZrO 2 Preparation of composite oxide catalyst

[0032] a) Take 35.5mL of 1mol / L zirconium oxychloride solution, add deionized water, add ammonia water drop by drop under stirring at room temperature until the pH is 9, filter the obtained precipitate with suction, and then dry it at 120°C for 24 hours, a dry sample was prepared, and the resulting sample was ground into a powder.

[0033] b) Take 1.92mL of 0.2mol / L ammonium tungstate solution, add deionized water, stir evenly at room temperature, add the powder obtained in step a) into the solution, and stir for 4 hours to obtain a slurry;

[0034]c) Dry the slurry prepared in step b) at 120°C for 24 hours to prepare a dry sample, place the sample in a muffle furnace and bake at 800°C for 4 hours, and grind the sample after cooling into powder;

[0035] d) Take 1.34mL 1mol / L chromium nitrate solution, add deionized water, stir evenly at room temperature, add the powder obtained ...

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Abstract

The invention discloses a chromium tungsten zirconium composite oxide denitration catalyst used for ammonia selective catalytic reduction of nitrogen oxide as well as a preparation method and an application of the catalyst and belongs to the technical field of environment catalysis and air pollution control. The catalyst takes zirconium oxide as a carrier and chromium oxide and tungsten trioxide as active components and is prepared with a stepped impregnation method. The chromium tungsten zirconium composite oxide denitration catalyst has the characteristics that the active temperature window of the catalyst is wide and the catalyst has excellent water resistance and sulfur resistance. When the space velocity of the prepared chromium tungsten zirconium composite oxide denitration catalyst is 98,000 per hour, the nitrogen oxide purification efficiency reaches 72%-96% within the range of 300-450 DEG C.

Description

technical field [0001] The invention relates to a chromium-tungsten-zirconium composite oxide catalyst and its preparation and application. The catalyst can be used in stationary sources such as thermal power plants and industrial boilers and mobile sources such as diesel vehicles to discharge nitrogen oxides (NO x ), belongs to the technical field of environmental catalysis and air pollution control. Background technique [0002] With the growth of energy consumption and the increase of motor vehicle ownership, NO x Emissions are increasing, NO x It can cause a series of environmental problems such as acid rain and photochemical smog. Therefore, NO x Emission control has become a research hotspot in the field of environmental catalysis and air pollution control technology. Ammonia Selective Catalytic Reduction of NO x (NH 3 -SCR) is currently used for NO x Elimination of the mainstream technology, the core issue is the development of high-efficiency catalysts. NH fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/90B01D53/56
CPCB01D53/56B01D53/90B01D53/9413B01D2255/40B01J23/002B01J23/30B01J2523/00B01J2523/48B01J2523/67B01J2523/69
Inventor 刘志明苏行
Owner BEIJING UNIV OF CHEM TECH
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