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Titanium dioxide-based catalyst, and preparation method and application thereof

A titanium dioxide and catalyst technology, applied in the field of titanium dioxide-based catalysts and their preparation, can solve the problems of molecular sieve skeleton collapse, catalyst activity decline, dealumination, etc., and achieve the effects of increasing surface oxygen holes, promoting uniform dispersion, and high nitrogen selectivity

Active Publication Date: 2017-11-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, zeolite catalysts are prone to dealumination under high-temperature hydrothermal conditions, and the molecular sieve framework collapses, resulting in a rapid decline in catalyst activity.

Method used

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  • Titanium dioxide-based catalyst, and preparation method and application thereof
  • Titanium dioxide-based catalyst, and preparation method and application thereof
  • Titanium dioxide-based catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: CuO / TiO 2 -Nb 2 o 5 Catalyst preparation

[0052] Weigh 0.17g sodium dodecylbenzenesulfonate and dissolve it in 100mL ultrapure water, then add 1.72g TiOSO in the mixed solution 4 · x H 2 SO 4 · x H 2 O (titanyl sulfate, molecular weight 159.95), stirred and mixed. Weigh 2.70g NbCl 5 (Molecular weight is 270.17), join in 50mL ultrapure water. The two solutions were mixed and stirred for 30 min. Weigh 9.01 g of urea and dissolve it in 100 mL of ultrapure water to prepare an aqueous urea solution. The urea aqueous solution was added dropwise to the above mixed solution for stirring, and the temperature was raised to 85° C., and reacted for 3 hours. After the reaction, the mixed solution was cooled to normal temperature at room temperature of 25° C., the supernatant was discarded, and the turbid solution was centrifuged to obtain a white precipitate. Wash the white precipitate 4 times with ultrapure water, AgNO 3 solution and BaCl 4 Solution detecti...

Embodiment 2

[0054] Example 2: CuO / TiO 2 -Nb 2 o 5 Catalyst preparation

[0055] Weigh 0.17g sodium dodecylbenzenesulfonate and dissolve it in 100mL ultrapure water, then add 1.72g TiOSO in the mixed solution 4 · x H 2 SO 4 · x H 2 O (titanyl sulfate, molecular weight 159.95), stirred and mixed. Weigh 2.70g NbCl 5 (Molecular weight is 270.17), join in 50mL ultrapure water. The two solutions were mixed and stirred for 30 min. Weigh 9.01 g of urea and dissolve it in 100 mL of ultrapure water to prepare an aqueous urea solution. The urea solution was added dropwise to the above mixed solution for stirring, and the temperature was raised to 80° C., and reacted for 3 hours. After the reaction, the mixed solution was cooled to normal temperature at room temperature of 25° C., the supernatant was discarded, and the turbid solution was centrifuged to obtain a white precipitate. Wash the white precipitate 3 times with ultrapure water, AgNO 3 solution and BaCl 4 Solution detection wash ...

Embodiment 3

[0057] Example 3: CuO / TiO 2 -Nb 2 o 5 Catalyst preparation

[0058] Weigh 0.17g sodium dodecylbenzenesulfonate and dissolve it in 100mL ultrapure water, then add 1.72g TiOSO in the mixed solution 4 · x H 2 SO 4 · x H 2 O (titanyl sulfate, molecular weight 159.95), stirred and mixed. Weigh 2.70g NbCl 5 (Molecular weight is 270.17), join in 50mL ultrapure water. The two solutions were mixed and stirred for 30 min. Weigh 9.01 g of urea and dissolve it in 100 mL of ultrapure water to prepare an aqueous urea solution. The urea solution was added dropwise to the above mixed solution for stirring, and the temperature was raised to 100° C., and reacted for 3 hours. After the reaction, the mixed solution was cooled to normal temperature at room temperature of 25° C., the supernatant was discarded, and the turbid solution was centrifuged to obtain a white precipitate. Wash the white precipitate 5 times with ultrapure water, AgNO 3 solution and BaCl 4 Solution detection wash...

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Abstract

The invention discloses a titanium dioxide-based catalyst, and a preparation method and application thereof. The preparation method comprises the following steps: mixing titanyl sulfate, niobium pentachloride, urea, sodium dodecyl benzene sulfonate and water, then carrying out a reaction, carrying out cooling after the reaction, and subjecting a precipitate to centrifugation, washing, drying and calcinations so as to obtain a titanium niobium binary oxide carrier; and mixing the titanium niobium binary oxide carrier with an aqueous copper nitrate solution and then carrying out ultrasonic treatment, stirring, drying and calcining successively so as to obtain the titanium dioxide-based catalyst. The preparation method provided by the invention is simple in process and easy to operate and implement. The titanium dioxide-based catalyst prepared in the invention can be used for selective catalytic reduction of nitrogen oxides in virtue of ammonia, has high nitrogen oxide reduction ability and nitrogen selectivity, a wide reaction window, high anti-sulfur dioxide poisoning performance and high hydrothermal stability, and also has the advantages of economic performance, environment friendliness, easiness in industrialization, etc.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide-based catalysts, in particular to a titanium dioxide-based catalyst and its preparation method and application. Background technique [0002] As the most important primary energy in my country, coal is widely used in the production of electricity and heat. However, the combustion of fossil fuels such as coal and oil will produce a large amount of nitrogen oxides (NO x ), sulfur dioxide (SO 2 ) and fine particles and other substances that pollute the environment. Among them, NO x Emissions into the air will cause a series of environmental problems such as acid rain, photochemical smog, and an increase in the concentration of the ozone layer near the ground. At the same time, NO x It is also one of the pollutants that cause the increasingly serious smog phenomenon in recent years. The increasingly serious environmental pollution hinders my country's economic development and poses a th...

Claims

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Application Information

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IPC IPC(8): B01J23/847B01J37/02B01J37/03B01J37/08B01J37/34B01D53/86B01D53/56
CPCB01D53/8628B01D2255/20707B01D2255/20761B01D2258/0283B01J23/002B01J23/8474B01J37/0201B01J37/031B01J37/082B01J37/343B01J2523/00B01J2523/17B01J2523/47B01J2523/56
Inventor 李素静王晓祥李伟施贇从其良
Owner ZHEJIANG UNIV
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