Cerium dioxide-based composite catalyst, and preparation method and application thereof

A technology of composite catalyst and ceria, which is applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of low catalytic efficiency and high cost, and achieve particle Uniform size, low cost, good catalytic degradation effect

Active Publication Date: 2018-11-30
ZUNYI NORMAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems of high cost and low catalytic efficiency in the visible light region in the prior art, the present invention provides a ceria-based composite catalyst and its preparation method and application

Method used

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  • Cerium dioxide-based composite catalyst, and preparation method and application thereof
  • Cerium dioxide-based composite catalyst, and preparation method and application thereof
  • Cerium dioxide-based composite catalyst, and preparation method and application thereof

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Embodiment 1

[0030] 1. Co-precipitation method to prepare ceria-based composite catalyst active component La 2 o 3 / Fe 2 o 3 -CeO 2

[0031] Dissolve 0.868g of cerium nitrate hexahydrate, 0.013g of lanthanum nitrate and 0.024g of ferric nitrate in 100mL of deionized water and mix evenly, then slowly add the solution into a 250mL three-necked bottle, heat water at 80°C, and mechanically stir at a speed of 350rpm. Add 1.0 mol / L ammonium bicarbonate solution dropwise at mL / min, control the end point pH of the reaction solution to be about 10.0, and continue heating and stirring for 0.5 h. After cooling to room temperature, the red precipitate was obtained by centrifugal filtration, and washed with deionized water until neutral, and the obtained precipitate was dried in an oven at 80°C for 10 hours to obtain a precursor, which was then roasted in a muffle furnace at 550°C for 4 hours. ceria-based composite catalyst active component La 2 o 3 / Fe 2 o 3 -CeO 2 ;

[0032] 2. Ceria-based...

Embodiment 2

[0038] All the other are the same as embodiment 1, change the doping amount of lanthanum nitrate and ferric nitrate, the add-on of lanthanum nitrate and ferric nitrate is changed by 0.008g, 0.016g, 0.04g, 0.056g and 0.08g respectively.

Embodiment 3

[0040] All the other are the same as embodiment 1, change La 2 o 3 / Fe 2 o 3 -CeO 2 Relative to γ-Al 2 o 3 content, La 2 o 3 / Fe 2 o 3 -CeO 2 The amount of the added amount was changed by 0.06g, 0.14g and 0.2g respectively.

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Abstract

The invention discloses a cerium dioxide-based composite catalyst, and a preparation method and application thereof. According to the catalyst provided by the invention, gamma-Al2O3 is used as a carrier, and an active component of the catalyst is composed of La2O3, Fe2O3 and CeO2, wherein the mass ratio of the active component to the carrier is 0.01-0.2, and the molar ratio of the sum of the La2O3and Fe2O3 to the CeO2 is 0.01-0.1. According to the invention, cerium nitrate, lanthanum nitrate, ferric nitrate and ammonium bicarbonate are taken as raw materials, and the catalyst active componentLa2O3/Fe2O3-CeO2 is prepared by using a co-precipitation method. Due to the doping of lanthanum and iron, cerium dioxide lattices are distorted and generate defects, so that the oxidation-reduction capability of cerium dioxide is enhanced, and therefore a good photocatalytic performance is achieved. A nano sheet-shaped gamma-Al2O3 carrier is taken to support the active component by adopting an impregnation method, so that the cerium dioxide-based composite catalyst is obtained. The catalyst disclosed by the invention has high catalytic degradation activity on printing and dyeing wastewater. The preparation method is simple, the cost is low, and industrial production is easy to realize.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a ceria-based composite catalyst and a preparation method and application thereof. Background technique [0002] At present, the total annual production of dyes in the world is more than 600,000 tons, of which more than 50% are used for textile dyeing; and in textile printing and dyeing, 10% to 20% of dyes are discharged as waste. my country's annual textile wastewater discharge is about 2.37 billion tons, and printing and dyeing wastewater accounts for 80%. The chroma of printing and dyeing wastewater is particularly serious, and it is difficult to remove it with general biochemical methods. The reuse rate of wastewater treatment in the whole industry is only about 10%. The dyes in the wastewater can absorb light, reduce the transparency of the water body, affect the growth of aquatic organisms and microorganisms, and are not conducive to the self-purification of the water body. At the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C02F1/32C02F101/30
CPCB01J23/002B01J23/83B01J35/004B01J2523/00C02F1/32C02F2101/308C02F2305/10B01J2523/3706B01J2523/3712B01J2523/842B01J2523/31
Inventor 李友凤王光伟喻艇
Owner ZUNYI NORMAL COLLEGE
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