Preparation of VO2 nanosheet material and applications thereof

A VO2 and nanosheet technology, applied in the field of VO2 nanosheet materials and their preparation, to achieve the effects of uniform crystal phase, uniform morphology, high activity and selectivity

Active Publication Date: 2014-09-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Benzene is extremely difficult to be oxidized under mild conditions. Although it is easy to react at high temperature, it is also easy to be deeply oxidized into tar-like substances or completely oxidized into CO 2

Method used

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  • Preparation of VO2 nanosheet material and applications thereof
  • Preparation of VO2 nanosheet material and applications thereof
  • Preparation of VO2 nanosheet material and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Preparation of Material A (X-100-10)

[0025] Take 30g of ethylene glycol and 30g of water and mix and stir for 10min, then add 1g of V 2 o 5 Stir for 10min, add the mixed solution into a reaction kettle lined with polytetrafluoroethylene, and pass through N 2 Air for 1 min. The resulting mixed solution was sealed, put into an oven at 100° C., and subjected to hydrothermal reaction for 10 h. The obtained material was first centrifuged, poured out the supernatant, added 20ml of water, ultrasonicated for 10min, centrifuged again, poured out the supernatant, washed with water for 3 times, then added 20ml of ethanol and washed with ethanol for 3 times, and then washed in 80°C VO was obtained after drying under vacuum conditions 2 Nanosheet material X-100-10.

Embodiment 2

[0026] Example 2 Material B

[0027] The preparation method of material B-I is the same as that of material A, except that the temperature and time of hydrothermal reaction are different. The specific temperature and time are shown in Table 1, and the obtained materials are listed in Table 1.

[0028] Table 1 The temperature and time of the hydrothermal reaction adopted in the preparation of material B-I

[0029] material code Water temperature (℃) Water heating time (h) material name B 100 20 X-100-20 C 100 40 X-100-40 D 140 10 X-140-10 E 140 20 X-140-20 F 140 40 X-140-40 G 180 10 X-180-10 H 180 20 X-180-20 I 180 40 X-180-40

Embodiment 3

[0030] The preparation of embodiment 3 material J (Y-100-10)

[0031] Take 30g xylitol, 30g water and mix and stir for 10min, then add 1g NH 4 VO 3 Stir for 10min, add the mixed solution into a reaction kettle lined with polytetrafluoroethylene, and pass through N 2 Air for 1 min. The resulting mixed solution was sealed, put into an oven at 100° C., and subjected to hydrothermal reaction for 10 h. The obtained material was first centrifuged, poured out the supernatant, added 20ml of water, ultrasonicated for 10 minutes, centrifuged again, poured out the supernatant, washed repeatedly for 3 times, then added 20ml of ethanol for 3 times, and then vacuumed at 80 degrees VO after drying 2 Nanosheet material Y-100-10.

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Abstract

The invention relates to a preparation of a VO2 nanosheet material and applications thereof. The preparation is characterized in that one or more of ethylene glycol, glycerin, erythritol, xylitol, mannitol, sorbitol, fructose, glucose and the like are used as a reducing reagent, and one or more of V2O5, NH4VO3, VOPO4, VOCl3, VO (C3H7O)3 are used as a vanadium source. The reducing temperature is 100-180 DEG C, and the reaction time is 10-40 hours. The VO2 nanosheet material is used as a catalyst, molecular oxygen is used as an oxygen source, liquid phase catalytic oxide benzene is prepared into phenol, and the selectivity of the phenol can achieve 80 percent. The method has the characteristics of cheap raw materials, simplicity in process, convenience in operation, uniform morphology, high purity of products and the like.

Description

technical field [0001] The present invention relates to a VO 2 Nanosheet material and its preparation method. The invention relates to the application of the above materials in the liquid phase selective oxidation of benzene. Background technique [0002] Because of its relatively small size and unique physical and chemical properties, vanadium oxide nanomaterials have a high application background in the fields of catalysis, batteries, transistors, sensors, nanodevices, etc., which has attracted widespread attention in academia and industry. focus on. where VO 2 As an oxide of vanadium, its vanadium is in an intermediate valence state and is easily oxidized to V 2 o 5 , or revert to V 2 o 3 , so VO 2 The material has good electrical and optical properties, which facilitate electron transfer in catalytic applications. General VO 2 The grain size of the material is relatively large, and there is no preferential growth of crystal planes, no active centers, or very fe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02B82Y40/00B01J23/20C07C39/04C07C37/58
CPCY02P20/52
Inventor 徐杰陈星王峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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