Preparation method of antimony-doped modified cerium-tungsten oxide loaded titanium dioxide denitration catalyst

A denitration catalyst, titanium dioxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problem of urgent need to improve the catalytic efficiency, and control the production cost. , Environmental toxicity is small, the effect of improving catalytic activity

Inactive Publication Date: 2019-10-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the medium and high temperature activity of cerium-tungsten catalysts has been further broadened, the catalytic efficiency at low temperatures (≤250°C) needs to be improved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A certain amount of cerium precursor salt and tungstic acid precursor salt are added to a beaker with a certain amount of ionized water, and the target makes the catalyst have 10wt% CeO 2 and 6 wt% WO 3 Content. Then put the above-mentioned beaker in the ultrasonic pool for 1h, and then remove the beaker from the ultrasonic pool. Then place it on the water bath and stir, add the P25TiO with a mass fraction of 84wt% 2 support, and stirred for 0.5h, then heated up to 80°C, and at this temperature, the active components were gradually supported on the titanium dioxide support until all the precursor salts were completely loaded on TiO 2 Then the body of the obtained catalyst was placed in an oven at 120 °C for 10 h to fully dry the catalyst precursor. Take the product out of the beaker and grind it in a mortar, then put it in a tube furnace, raise the temperature to 500°C at a rate of 2°C / min, calcinate for 4h, and then get antimony-doped cerium tungsten oxide denitrific...

Embodiment 2

[0026] A certain amount of cerium precursor salt and tungstic acid precursor salt are added to a beaker with a certain amount of ionized water, and the target makes the catalyst have 10wt% CeO 2 and 6 wt% WO 3 content, and make the content of antimony oxide in the antimony catalyst be 1wt%, then place the above-mentioned beaker in the ultrasonic bath for 1 hour, and then take the beaker out of the ultrasonic bath. Then place it on the water bath and stir, add the P25TiO with a mass fraction of 83wt% 2 support, and stirred for 0.5h, then heated up to 80°C, and at this temperature, the active components were gradually supported on the titanium dioxide support until all the precursor salts were completely loaded on TiO 2 Then the body of the obtained catalyst was placed in an oven at 120 °C for 10 h to fully dry the catalyst precursor. Take the product out of the beaker and grind it in a mortar, then put it in a tube furnace, raise the temperature to 500°C at a rate of 2°C / min,...

Embodiment 3

[0029] A certain amount of cerium precursor salt and tungstic acid precursor salt are added to a beaker with a certain amount of ionized water, and the target makes the catalyst have 10wt% CeO 2 and 6 wt% WO 3 content, and make the content of antimony oxide in the antimony catalyst be 3wt%, then place the above-mentioned beaker in the ultrasonic bath for 1h, and then take the beaker out of the ultrasonic bath. Then place it on the water bath and stir, add the P25TiO with a mass fraction of 81wt% 2support, and stirred for 0.5h, then heated up to 80°C, and at this temperature, the active components were gradually supported on the titanium dioxide support until all the precursor salts were completely loaded on TiO 2 Then the body of the obtained catalyst was placed in an oven at 120 °C for 10 h to fully dry the catalyst precursor. Take the product out of the beaker and grind it in a mortar, then put it in a tube furnace, raise the temperature to 500°C at a rate of 2°C / min, calc...

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Abstract

The invention relates to an antimony-doped cerium-tungsten loaded titanium dioxide catalyst prepared through an ultrasound-assisted impregnation method. A preparation method comprises the steps that (1) by weight, 1-7% of antimony precursor salt, 10% of cerium precursor salt and 6% of precursor salt are added into deionized water; (2) the precursor salts are dissolved and placed in an ultrasonic pool for one hour, then a titanium dioxide carrier is added and put into a water bath kettle to be stirred for 0.5 h and then heated up to 80 DEG C till the precursor salts are completely loaded on thecarrier, and the carrier is placed in an air dry oven at 120 DEG C to be dried; and (3) an obtained sample is ground and calcined at 500 DEG C. The catalyst has the large specific surface area, the temperature window can be expanded effectively, and meanwhile, the antimony-doped cerium-tungsten loaded titanium dioxide catalyst has the advantages of being quite high in water resistance stability,simple in production process, suitable for large-scale industrial production and the like, and can be used for removing nitrogen oxide discharged by a stationary source and a moving source.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide control in environmental protection, in particular to the preparation and application of an antimony-doped modified cerium tungsten oxide-supported titanium dioxide catalyst, which can be used for removal of nitrogen oxides emitted from stationary sources and mobile sources. Background technique [0002] Nitrogen oxides are one of the main pollutants in the atmosphere, which can cause major environmental problems such as acid rain and photochemical smog, and cause great damage to the natural environment and biological health. At present, the main sources of man-made nitrogen oxides are stationary sources represented by coal-fired power plants and mobile sources represented by diesel vehicles. Therefore, how to achieve efficient removal of nitrogen oxides has become an important research topic at present. Among the commonly used nitrogen oxide removal technologies, NH 3 Selective catalytic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/10B01J37/08B01J37/34B01J37/02B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/30B01J35/1004B01J37/0201B01J37/082B01J37/343B01J2523/00B01J2523/3712B01J2523/47B01J2523/69
Inventor 张登松施利毅刘阳养李红蕊张剑平
Owner SHANGHAI UNIV
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