Sintering-resistant mosaic Pd@cerium dioxide nanotube catalyst and preparation method thereof

A technology of ceria and nanotubes, which is applied in the field of mosaic Pd@CeO2 nanotube catalysts and their preparation, can solve the problems of catalyst incapability of industrial production, deactivation, and deterioration of catalyst reactivity, and achieve good carbon monoxide oxidation activity and stability performance, anti-sintering effect

Active Publication Date: 2019-08-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the influence of sintering, many catalysts cannot really be used in industrial production
When the Pd-based catalyst is sintered, the specific surface area of ​​Pd metal on it decreases, which reduces the active sites a...

Method used

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  • Sintering-resistant mosaic Pd@cerium dioxide nanotube catalyst and preparation method thereof
  • Sintering-resistant mosaic Pd@cerium dioxide nanotube catalyst and preparation method thereof
  • Sintering-resistant mosaic Pd@cerium dioxide nanotube catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Dissolve 0.2g of PVP in a mixed solvent of ethanol (14ml) and water (21ml), and add 24mL of chloropalladium acid solution (2.0mM) after complete dissolution. After stirring and refluxing at 110° C. for 3 h, the solvent was evaporated to dryness by a rotary evaporator to obtain a dark brown PVP-Pd colloid.

[0023] (2) Dissolve the PVP-Pd colloid in 50 mL of ethanol, and add 0.50 g of carbon nanotubes with a diameter in the range of 30-50 nm. Stirring at 40°C for 24h, evaporating the solvent to dryness, and calcining at 300°C for 60min to obtain Pd / CNT.

[0024] (3) Add 1.26g of cerous nitrate to 50mL of ethylene glycol, stir vigorously to form a transparent homogeneous solution, add Pd / CNT, mix the solution evenly after ultrasonication for 60min, transfer it to the reaction kettle, and obtain after hydrothermal reaction at 200℃ for 24h Yellow-brown colloid mixed with black particles. Centrifuged, washed five times with deionized water, washed once with ethanol, an...

Embodiment 2

[0027] (1) Dissolve 0.2g PVP in the mixed solvent of ethanol (14ml) and water (21ml), after completely dissolving

[0028] 24 mL of chloropalladic acid solution (2.0 mM) was added. Stir and reflux at 110° C. for 3 h, and evaporate the solvent to dryness by a rotary evaporator to obtain a dark brown PVP-Pd colloid.

[0029] (2) Dissolve the PVP-Pd colloid in 50 mL of ethanol, and add 0.35 g of carbon nanotubes with a diameter in the range of 30-50 nm. Stir at 40°C for 20h, evaporate the solvent to dryness, and bake at 300°C for 50min to obtain Pd / CNT.

[0030] (3) Add 1.26g of cerous nitrate to 50mL of ethylene glycol, stir vigorously to form a transparent and uniform solution, add Pd / CNT, mix the solution evenly after ultrasonication for 50min, transfer it to the reaction kettle, and obtain after hydrothermal reaction at 200℃ for 24h Yellow-brown colloid mixed with black particles. Centrifuged, washed five times with deionized water, washed once with ethanol, and dried at 6...

Embodiment 3

[0033](1) Dissolve 0.2g of PVP in a mixed solvent of ethanol (14ml) and water (21ml), and add 24mL of chloropalladium acid solution (2.0mM) after complete dissolution. Stir and reflux at 110° C. for 3 h, and evaporate the solvent to dryness by a rotary evaporator to obtain a dark brown PVP-Pd colloid.

[0034] (2) Dissolve the PVP-Pd colloid in 50 mL of ethanol, and add 0.29 g of carbon nanotubes with a diameter in the range of 30-50 nm. Stir at 40°C for 16h, evaporate the solvent to dryness, and bake at 300°C for 40min to obtain Pd / CNT.

[0035] (3) Add 1.26g of cerous nitrate to 50mL of ethylene glycol, stir vigorously to form a transparent homogeneous solution, add Pd / CNT, mix the solution evenly after ultrasonication for 40min, transfer it to the reaction kettle, and react hydrothermally at 200℃ for 24h to obtain Yellow-brown colloid mixed with black particles. Centrifuged, washed five times with deionized water, washed once with ethanol, and dried at 60°C to obtain a pu...

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Abstract

The invention discloses a sintering-resistant mosaic Pd@CeO2 nanotube catalyst and a preparation method thereof, and belongs to the field of catalysts. The catalyst comprises hollow tubular cerium dioxide (CeO2) and palladium (Pd) nanoparticles, and the Pd nanoparticles are inlaid at the inner side of the tubular CeO2; the load capacity of the Pd nanoparticles is 0.4-5.0 wt%, and the particle sizeis 2-3 nm; and the caliber of the CeO2 nanotube is 20-80 nm. Compared with traditional structured catalysts with Pd loaded on the surface of a CeO2 carrier, the catalyst of the invention can effectively prevent sintering due to the inlaying of the Pd nanoparticles at the inner side of the tubular structure of the CeO2 nanotube. The Pd is fixed at the physical position through the deposition of the CeO2 particle, and the Pd is further anchored by the chemical bonds between the Pd particle and the adjacent CeO2, so the Pd nanoparticles are still uniformly dispersed at a high temperature, and the catalyst has a good oxidation activity and stability to carbon monoxide.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a mosaic type Pd@CeO which can resist sintering 2 A nanotube catalyst and a preparation method thereof, the catalyst can be used for the removal of low-concentration carbon monoxide, and can still maintain excellent activity at high temperatures. Background technique [0002] Carbon monoxide is a colorless, odorless, poisonous gas. It mainly comes from the incomplete combustion or partial oxidation of fuels such as coal, gasoline and natural gas, the chemical industry and the use of motor vehicles. The catalytic oxidation of carbon monoxide is of great significance in basic research, practical application and environmental protection, such as CO gas detectors, breathing gas purification devices and automobile exhaust treatment. [0003] The catalysts used in the oxidation reaction of carbon monoxide can be mainly divided into two types: non-precious metal catalysts and noble metal cata...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J37/08B01J35/10B01D53/86B01D53/62B01D53/94
CPCB01D53/864B01D53/9404B01D2257/502B01D2258/01B01J23/63B01J35/006B01J35/10B01J37/082Y02A50/20
Inventor 程党国叶菁睿陈丰秋詹晓力
Owner ZHEJIANG UNIV
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