Layered core-shell structure catalyst, preparation method and application thereof in low-temperature catalytic oxidation of toluene

A technology of core-shell structure and catalyst, which is applied in low-temperature catalytic oxidation of toluene, environmental pollutant degradation catalyst, layered core-shell structure catalyst, and preparation fields. It can solve the problems of failure to achieve better performance and achieve excellent reducibility, Large oxygen release and storage capacity, effect of toluene elimination

Active Publication Date: 2022-01-28
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalytic combustion of toluene by this composite catalytic material fails to achieve good performance, and the Pd / Ce-manganese oxide molecular sieve catalyst can only achieve 90% degradation rate of toluene at 217 ° C.

Method used

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  • Layered core-shell structure catalyst, preparation method and application thereof in low-temperature catalytic oxidation of toluene
  • Layered core-shell structure catalyst, preparation method and application thereof in low-temperature catalytic oxidation of toluene
  • Layered core-shell structure catalyst, preparation method and application thereof in low-temperature catalytic oxidation of toluene

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Step 1. Mesoporous CeO 2 Preparation of nanorods: 15 g of cerium nitrate was dissolved in 20 mL of distilled water, and 6.24 g of urea was dissolved in 20 mL of distilled water. The cerium nitrate solution and the urea solution were mixed and sealed in a high-pressure reactor, and placed in a blast drying oven at 120°C for 16 hours. After cooling to room temperature, the precipitate was obtained by centrifugation with a high-speed centrifuge, and then placed in a blast drying oven for drying treatment at 60°C for 12 hours. The obtained powder was placed in a tube furnace, and the temperature was raised to 400 °C at a heating rate of 2 °C / min and then kept for 4 h.

[0034] Step 2. Core-shell structure composite material mCeO 2 @MnO 2 Preparation: Take 300mg of prepared mesoporous CeO in step one 2 Nanorod powder was dissolved in 80mL of water, and ultrasonically dissolved; 1.2g of manganese nitrate solution was added, mixed evenly, and ultrasonically dispersed; the ...

Embodiment 2

[0042] Step 1. Mesoporous CeO 2 Preparation of nanorods: 16 g of cerium nitrate was dissolved in 20 mL of distilled water, and 6.4 g of urea was dissolved in 20 mL of distilled water. The cerium nitrate solution and the urea solution were mixed and sealed in a high-pressure reactor, and placed in a blast drying oven at 100°C for 18 hours. After cooling to room temperature, the precipitate was obtained by centrifugation with a high-speed centrifuge, and then placed in a blast drying oven at a temperature of 50° C. for 24 hours. The obtained powder was placed in a tube furnace, and the temperature was raised to 450 °C at a heating rate of 3 °C / min and then kept for 4 h.

[0043] Step 2. Core-shell structure composite material mCeO 2 @MnO 2 Preparation: Take 300mg of prepared mesoporous CeO in step one 2 Nanorod powder was dissolved in 80mL water and dissolved by ultrasonic; 0.3g of manganese nitrate solution was added, mixed evenly, and dispersed by ultrasonic; After centri...

Embodiment 3

[0046] Step 1. Mesoporous CeO 2 Preparation of nanorods: 14 g of cerium nitrate was dissolved in 20 mL of distilled water, and 6 g of urea was dissolved in 20 mL of distilled water. The cerium nitrate solution and the urea solution were mixed and sealed in a high-pressure reactor, and placed in a blast drying oven at 110°C for 17 hours. After cooling to room temperature, the precipitate was obtained by centrifugation with a high-speed centrifuge, and then placed in a blast drying oven at a temperature of 55° C. for 18 hours. The obtained powder was placed in a tube furnace, and the temperature was raised to 400 °C at a heating rate of 2.5 °C / min and then kept for 4 h.

[0047] Step 2. Core-shell structure composite material mCeO 2 @MnO 2 Preparation: Take 300mg of prepared mesoporous CeO in step one 2 Nanorod powder was dissolved in 80mL water and dissolved by ultrasonic; add 3g of manganese nitrate solution, mix evenly, and ultrasonically disperse; After centrifuging wit...

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Abstract

The invention discloses a layered core-shell structure catalyst, a preparation method and application thereof in low-temperature catalytic oxidation of toluene, the catalyst takes a mesoporous cerium dioxide nanorod as a core, a coating layer comprises a manganese dioxide nanosheet layer and an active component loaded on the manganese dioxide nanosheet layer, and the active component is platinum nanoparticles. By applying the catalyst, the toluene degradation rate can reach 95.6% under the conditions that the temperature is 165 DEG C and the toluene concentration is 1000ppm. According to the core-shell structure catalyst, the activity of the catalyst can be improved while the cost is reduced, and methylbenzene in industrial tail gas can be quickly and efficiently eliminated.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemistry, and relates to a catalyst for degrading environmental pollutants, in particular to a catalyst with a layered core-shell structure, a preparation method, and an application of low-temperature catalytic oxidation of toluene. Background technique [0002] From the perspective of various treatment technologies for removing volatile organic compounds (VOCs) in the prior art, the catalytic oxidation method is considered to be the most effective method because of no secondary pollution and low energy consumption. Catalytic combustion efficiently and economically converts low concentrations of VOCs into harmless water and carbon dioxide. Due to the unique advantages of catalytic oxidation, people have been devoting themselves to the development of highly efficient catalysts for the catalytic oxidation of volatile organic compounds. Therefore, the research and development of high-performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01J35/10B01D53/86B01D53/72
CPCB01J23/6562B01J35/1014B01D53/8668
Inventor 陈浩彭银仙王静田志全陆肖苏
Owner JIANGSU UNIV OF SCI & TECH
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