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Modified titanium dioxide catalyst with special morphology and preparation method and application thereof

A titanium dioxide and catalyst technology, applied in the field of titanium dioxide catalyst and its preparation, can solve the problems of restricting industrialization and application, dealumination of molecular sieve carrier framework, narrow reaction window and other problems, and achieve easy operation and implementation, wide activity temperature window and high reaction temperature The effect of window width

Active Publication Date: 2020-04-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of catalyst has high reactivity, wide reaction temperature window, and good resistance to sulfur dioxide poisoning; however, it is easy to dealuminate the molecular sieve carrier framework under high temperature hydrothermal conditions, collapse and deactivate the catalyst
[0006] Noble metal SCR catalysts refer to catalysts with Pt, Ag, Pd, Rh and other noble metals as active components. This type of catalyst has high low-temperature reaction activity, and can use carbon hydrocarbon (HC) organic gases as reducing substances to reduce NO x Catalytic reduction has strong resistance to water vapor and sulfur dioxide poisoning, and the three-way catalytic effect is better; however, the reaction window of this type of catalyst is relatively narrow, and the defects of high preparation cost limit its further industrial application.

Method used

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  • Modified titanium dioxide catalyst with special morphology and preparation method and application thereof
  • Modified titanium dioxide catalyst with special morphology and preparation method and application thereof
  • Modified titanium dioxide catalyst with special morphology and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1: Synthesis of modified titania catalyst carrier with special morphology

[0063] Take 0.025ml of diethylenetriamine and quickly add it to 40ml of isopropanol, and stir with a magnet at room temperature of 25°C for 20 minutes to obtain a solution of diethylenetriamine in isopropanol. Then, 1.2 ml of titanium tetraisopropoxide was added to the isopropanol solution of diethylenetriamine, and then 0.1 g of niobium pentachloride was added to obtain a mixed solution, which was stirred at room temperature at 25° C. for 20 minutes. After stirring evenly, transfer to a polytetrafluoroethylene hydrothermal reaction kettle, and react at 170°C for 20 hours. After the reaction, the reaction kettle was naturally cooled to room temperature of 25°C, and then the precipitate was centrifuged, and the separated precipitate was washed 5 times with absolute ethanol, and then the precipitate was dried at 80°C for 10 hours in a vacuum environment. Finally, the dried precipitate was...

Embodiment 2

[0064] Example 2: Preparation of TiO2 Catalyst with Special Morphology Modification

[0065] Take by weighing the modified titania catalyst carrier with special appearance prepared by 1g embodiment 1, meanwhile, take by weighing 0.0445g copper nitrate or ferric nitrate or cerium nitrate (taking copper nitrate as an example here) and be dissolved in dehydrated alcohol, then, Immerse the equal volume of the carrier into the copper nitrate solution, ultrasonically disperse for 20 minutes, and then stir with a magnet for 6 hours. The stirred mixture was dried at 80° C. for 10 hours under vacuum environment. Finally, the dried solid is placed in a quartz tube furnace, and air is continuously introduced into the furnace. The temperature of the tube furnace is raised from room temperature 25°C to 500°C, and it is stably calcined at this temperature of 500°C for 3 hours to obtain a crystal with special morphology. Modified titanium dioxide catalyst.

Embodiment 3

[0066] Embodiment 3: the test of titania catalyst reactivity

[0067] According to the preparation method of the present invention in Example 1, the amount of niobium pentachloride was changed to synthesize titanium dioxide carriers with special morphology modified with different contents of niobium element. Several synthesized supports were tested for the catalytic reaction activity of selective catalytic reduction of nitrogen oxides by ammonia according to the following method.

[0068] According to the preparation method of the present invention in Example 2, the amount of nitrate was changed to prepare modified titanium dioxide catalysts with different mass fractions of active components. The prepared catalysts were tested for the catalytic reaction activity of selective catalytic reduction of nitrogen oxides by ammonia according to the following method.

[0069] Sieve the calcined carrier or catalyst into 40-60 mesh granules, take about 0.15g of the sieved catalyst and p...

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Abstract

The invention discloses a modified titanium dioxide catalyst with special morphology as well as a preparation method and application thereof, and the method comprises the following steps: mixing diethylenetriamine, titanium tetraisopropoxide, niobium pentachloride and isopropanol, then carrying out a high-temperature hydrothermal reaction, and carrying out product separation, washing, drying and calcining to obtain a catalyst carrier; and using active metal nitrate for doping active components to obtain the modified titanium dioxide catalyst with special morphology. The catalyst prepared by the method can be applied to ammonia gas selective catalytic reduction reaction of nitric oxide. The catalyst shows high nitrogen oxide conversion rate, nitrogen selectivity, wide reaction temperature window, excellent sulfur dioxide, steam and alkali metal poisoning resistance, effective modification element consumption reducing by the special morphology / structure, good production cost reducing, notoxicity on environment and human body, and good industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide catalysts, in particular to a titanium dioxide catalyst with special morphology, its preparation method and application. Background technique [0002] With the development of economy and the advancement of science and technology, more and more people pay attention to environmental issues. Air pollution and control, as the main components of environmental issues, have attracted the favor of many researchers. Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere. It mainly comes from two categories: fixed emission sources such as coal-fired power plants, waste incineration plants and industrial furnaces, and mobile emission sources such as diesel vehicle exhaust. At the same time, NO x It can cause a series of problems such as photochemical smog, acid rain, the hole in the ozone layer, and endanger the human respiratory system. Therefore, controlling NO in the atmospher...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J23/20B01J23/72B01J23/745B01J32/00B01J35/08B01D53/86B01D53/56
CPCB01J23/72B01J23/745B01J23/20B01J21/063B01D53/8628B01D2251/2062B01J35/51
Inventor 李素静王晓祥李伟陈靓马赫遥
Owner ZHEJIANG UNIV
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