Bismuth sulfide composite potassium tantalate niobate catalyst as well as preparation method and application thereof

A technology of potassium tantalum niobate and catalyst is applied in the field of bismuth sulfide composite potassium tantalum niobate catalyst and the preparation field of the catalyst, and achieves the effects of excellent photocatalytic and piezoelectric catalytic ammonia production performance and simple operation.

Active Publication Date: 2021-01-29
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as we know, there is no report on photocatalytic N2 immobilization of Bi2S3 / KTN

Method used

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  • Bismuth sulfide composite potassium tantalate niobate catalyst as well as preparation method and application thereof
  • Bismuth sulfide composite potassium tantalate niobate catalyst as well as preparation method and application thereof
  • Bismuth sulfide composite potassium tantalate niobate catalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a preparation method of bismuth sulfide composite potassium tantalum niobate, comprising:

[0040] (1) Weigh 44.80g KOH solid with an analytical balance and dissolve it in 40mL of ultrapure water, then weigh 3.315g (0.0075mol) Ta 2 o 5 and 0.665g (0.0025mol) Nb 2 o 5 Slowly put it into the above KOH solution, stir it magnetically for 1 hour, transfer it to the inner liner made of 100mL PPL, add ultrapure water to make the total volume of the suspension 80mL, stir it evenly with a glass rod, and put it into a hydrothermal reaction kettle. Hydrothermal reaction at 200°C for 24h. After the reaction is completed and cooled to room temperature, pour off the supernatant, wash with a mixed solution of ultrapure water and alcohol for 3 times; put it in an oven, and dry it at 60°C for 12 hours to obtain white KTa 0.75 Nb 0.25 o 3 solid solution.

[0041] (2) Weigh 9.6027gNa 2 S·9H 2 O, respectively configured as 100mL of Na 2 S solution (0.40mo...

Embodiment 2

[0043] (1) With the step of (1) in embodiment 1.

[0044] (2) Weigh 1.23g (0.005mol) KTa 0.75 Nb 0.25 o 3 Put the powder into a 100mL beaker filled with 55mL of ultrapure water, ultrasonicate at 120W for 30min to form a uniform dispersion, and pipette 0.25mL of the aforementioned Na 2 S solution was added dropwise to the suspension, magnetically stirred evenly, and then 0.0121gBi(NO 3 ) 3 ·5H 2 O crystals were magnetically stirred for 40 min, transferred to a 100 mL polytetrafluoroethylene-lined hydrothermal reactor, and hydrothermally heated at 120 °C for 12 h. After the reaction was completed and cooled to room temperature, the supernatant was discarded, washed with a mixed solution of ultrapure water and alcohol for 4 times, placed in a vacuum oven, and dried at 60°C for 16 hours in a vacuum environment to obtain the target product 0.25% Bi 2 S 3 / KTN.

Embodiment 3

[0046] (1) With the step of (1) in embodiment 1.

[0047] (2) Weigh 1.23g (0.005mol) KTa 0.75 Nb 0.25 o 3 Put the powder into a 100mL beaker filled with 55mL of ultrapure water, ultrasonicate at 120W for 30min to form a uniform dispersion, and pipette 0.5mL of the aforementioned Na 2 S solution was added dropwise to the suspension, magnetically stirred evenly, and then 0.0243gBi(NO 3 ) 3 ·5H 2 O crystals were magnetically stirred for 40 min, transferred to a 100 mL polytetrafluoroethylene-lined hydrothermal reactor, and hydrothermally heated at 120 °C for 12 h. After the reaction was completed and cooled to room temperature, the supernatant was discarded, washed with a mixed solution of ultrapure water and alcohol for 4 times, placed in a vacuum oven, and dried at 60°C for 16 hours in a vacuum environment to obtain the target product 0.5% Bi 2 S 3 / KTN.

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Abstract

The invention relates to a bismuth sulfide composite potassium tantalate niobate catalyst as well as a preparation method and application thereof. The general formula of the catalyst is x%Bi2S3/KTa0.75Nb0.25O3, wherein x is the molar ratio of Bi2S3 to KTa0.75Nb0.25O3 in the catalyst, and x is greater than or equal to 0.1 and less than or equal to 5. The KTa0.75Nb0.25O3 material is applied to piezoelectric catalysis and photocatalytic nitrogen fixation, and N2 is catalytically reduced into ammonia under the action of ultrasonic vibration or illumination. Due to the loading of Bi2S3, the piezoelectric catalysis performance and the photocatalytic ammonia synthesis performance of the KTa0.75Nb0.25O3 are further improved.

Description

technical field [0001] The invention relates to the field of photo-mechanical vibration combined catalyst materials, in particular to a bismuth sulfide composite potassium tantalum niobate catalyst and a preparation method and application of the catalyst. Background technique [0002] As an ideal green fuel, H 2 It is considered to be a substitute for fossil energy in the future. However, high production costs and difficulties in storage and transportation greatly limit its application prospects. Ammonia consists of one nitrogen atom and three hydrogen atoms, is easily decomposed into nitrogen and hydrogen, and has the property of being easily liquefied, so it is considered to be more efficient than H 2 A better hydrogen energy carrier. However, like hydrogen, ammonia suffers from high production costs. Currently, The process is the most widely used synthetic ammonia process in industry, but its high temperature, high pressure reaction conditions and the large amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C01C1/04
CPCB01J27/04B01J35/004B01J35/0033C01C1/026Y02P20/52
Inventor 何益明王军峰李晓静戴孝全陈璐
Owner ZHEJIANG NORMAL UNIVERSITY
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