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Niobium pentoxide (at) reduced graphene oxide catalyst and preparation method and application thereof

A technology of niobium pentoxide and graphene, applied in the field of catalysis, can solve the problem of low selectivity of sulfoxide, and achieve the effect of improving catalytic efficiency

Active Publication Date: 2020-07-28
INST OF CHEM ENG GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current catalytic oxidation of thioether has a low selectivity to sulfoxide, so the development of a thioether oxidation catalyst with high catalytic selectivity is of great significance for the treatment of odor pollution and the improvement of economic benefits.

Method used

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  • Niobium pentoxide (at) reduced graphene oxide catalyst and preparation method and application thereof
  • Niobium pentoxide (at) reduced graphene oxide catalyst and preparation method and application thereof
  • Niobium pentoxide (at) reduced graphene oxide catalyst and preparation method and application thereof

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Embodiment 1

[0030] This embodiment provides a niobium pentoxide@reduced graphene oxide catalyst, the niobium pentoxide@reduced graphene oxide catalyst is prepared by the following steps:

[0031] (1) Add 0.15 g of N,N′-dicyclohexylcarbodiimide to 50 mL of graphene oxide dispersion with a concentration of 1 mg / mL, heat to 90° C. under sufficient stirring, and reflux for 3 h, then Stand still and cool to room temperature to obtain a mixed solution containing modified graphene oxide.

[0032] (2) Dissolve 0.3g of niobium pentachloride in 15mL of absolute ethanol to prepare an organic solution of niobium pentachloride with a concentration of 0.2g / mL. Then add the mixture in step (1) under ice bath, and stir in ice bath for 2h. Then transferred to a 50mL hydrothermal reaction kettle, and hydrothermally reacted at 190°C for 15h. The hydrothermal product was centrifuged (9000rpm, 5min) to obtain a solid, which was washed twice with deionized water and absolute ethanol, and finally washed once ...

Embodiment 2

[0036] This embodiment provides a preparation method of niobium pentoxide@reduced graphene oxide catalyst, comprising the following steps:

[0037] (1) Add 0.2 g of N,N'-dicyclohexylcarbodiimide to 100 mL of graphene dispersion with a concentration of 1 mg / mL, heat to 90°C under sufficient stirring, reflux for 3 hours, and then statically Set aside, cooled to room temperature.

[0038] (2) Dissolve 1.0 g of niobium pentachloride in 20 mL of absolute ethanol to prepare an organic solution of niobium pentachloride with a concentration of 0.5 g / mL. Then add the mixture in step (1) under ice bath, and stir in ice bath for 2h. Then transferred to a 50mL hydrothermal reaction kettle, and hydrothermally reacted at 180°C for 15h. The hydrothermal product was centrifuged (9000rpm, 5min) to obtain a solid, which was washed twice with deionized water and absolute ethanol, and finally washed once with deionized water, and then freeze-dried to obtain niobium pentoxide@reduced graphene ox...

Embodiment 3

[0040] This embodiment provides a preparation method of niobium pentoxide@reduced graphene oxide catalyst, comprising the following steps:

[0041] (1) Add 0.2 g of N,N'-dicyclohexylcarbodiimide to 100 mL of graphene dispersion with a concentration of 2 mg / mL, heat to 90°C under sufficient stirring, reflux for 3 hours, and then statically Set aside, cooled to room temperature.

[0042] (2) Dissolve 0.5 g of niobium pentachloride in 10 mL of absolute ethanol, then add the mixture in step (1) under ice bath, and stir in ice bath for 2 h. Then transferred to a 50mL hydrothermal reaction kettle, and hydrothermally reacted at 160°C for 15h. The hydrothermal product was centrifuged (9000rpm, 5min) to obtain a solid, which was washed twice with deionized water and absolute ethanol, and finally washed once with deionized water, and then freeze-dried to obtain niobium pentoxide@reduced graphene oxide catalyst.

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Abstract

The invention discloses a niobium pentoxide (at) reduced graphene oxide catalyst and a preparation method and application thereof. The preparation method of the niobium pentoxide (at) reduced grapheneoxide catalyst comprises the following steps of: 1) mixing a graphene oxide dispersion liquid with N-N'-dicyclohexylcarbodiimide, and reacting to obtain modified graphene oxide; and 2) adding the modified graphene oxide into a niobium pentachloride organic solution, and carrying out a hydrothermal reaction to obtain the niobium pentoxide (at) reduced graphene oxide catalyst. The graphene oxide ismodified by using N, N'-dicyclohexylcarbodiimide; then, the modified graphene oxide is combined with hydrolyzed niobium pentachloride through rich oxygen-containing groups on the surface of the graphene oxide; and finally the catalyst containing reduced graphene oxide and niobium pentoxide is obtained through a hydrothermal method. The catalyst has excellent catalytic selectivity on oxidation ofthioether into sulfoxide, and the sulfoxide selectivity is 85% or above.

Description

technical field [0001] The invention belongs to the technical field of catalysis, in particular to a niobium pentoxide@reduced graphene oxide catalyst and its preparation method and application. Background technique [0002] In the process of people's life and production, a large amount of waste will be generated in the environment, especially in places where pollution is concentrated and recycled, such as sewage treatment plants and landfills. In the process of pollution treatment, a large amount of malodorous gas will be produced, which will seriously affect the daily life and work of people in the surrounding areas, and leave a huge hidden danger to people's health. With the enhancement of people's awareness of environmental protection and the promulgation of relevant national policies, the treatment of odor pollution in the environment has been paid more and more attention. [0003] Odor pollution mainly comes from the industrial and agricultural production sectors and ...

Claims

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Application Information

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IPC IPC(8): B01J23/20B01J35/10B01J37/10C07C315/02C07C317/14C07C317/22C07C317/04C07C317/10
CPCB01J23/20B01J37/10C07C315/02B01J35/40B01J35/60B01J35/643B01J35/651B01J35/647C07C317/14C07C317/22C07C317/04C07C317/10
Inventor 戴永强林建达庞浩张磊苏瑜文明通麦裕良
Owner INST OF CHEM ENG GUANGDONG ACAD OF SCI
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