Preparation method and application of cerium ferrite-silver-attapulgite Z-type heterojunction catalyst

A technology of attapulgite and cerium ferrite, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of denitration performance, poor sulfur resistance, calcium Titanite nanoparticles are large in size and easy to agglomerate, which can improve the denitration and anti-sulfur activity, inhibit the vulcanization process, and achieve uniform dispersion.

Active Publication Date: 2018-12-25
JIANGSU HUAYUAN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, common TiO 2 The semiconductor band gap is wide, and the denitrification performance and sulfur resistance performance of the catalyst at low temperature are poor. Cerium ferrite (CeFeO 3 ) is a perovskite (ABO 3 ) structure of rare earth composite metal oxide, which has a narrow band gap (1.8eV), good sulfur resistance, and has good development prospects in the fields of environmental protection, industrial catalysis, etc. However, a single perovskite Nanoparticles are large in size and easy to agglomerate

Method used

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  • Preparation method and application of cerium ferrite-silver-attapulgite Z-type heterojunction catalyst
  • Preparation method and application of cerium ferrite-silver-attapulgite Z-type heterojunction catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weigh 0.8892g of cerium nitrate, 0.8275g of ferric nitrate, 0.0348g of silver nitrate, 1.0590g of citric acid dissolved in 100ml of deionized water, then dropwise add 2mL of ethylene glycol, and use sodium hydroxide solution Adjust its pH value to 8, place the mixed solution in a 70°C water bath and stir for 10 hours to obtain a cerium ferrite precursor-silver mixed system; wherein the cerium nitrate is cerium (III) nitrate hexahydrate, and the Ferric nitrate is cerium nitrate (III) nonahydrate;

[0022] (2) Stir and soak the attapulgite in hydrochloric acid at 60°C for 3 hours, then wash it with distilled water several times until the pH value of the washing liquid is 3.0, stop washing, then dry at 80°C, and then grind and sieve to obtain acidified attapulgite;

[0023] (3) Weigh 0.8892g of acidified attapulgite and add it to the cerium ferrite precursor-silver mixed system, continue to stir for 16h, and evaporate to obtain a wet gel, then put the wet gel in a 70°...

Embodiment 2

[0025] (1) Weigh 0.8892g of cerium nitrate, 2.4825g of ferric nitrate, 0.1741g of silver nitrate, 3.1528g of citric acid dissolved in 100ml of deionized water, then dropwise add 4mL of ethylene glycol, and use sodium hydroxide solution Adjust its pH value to 10, place the mixed solution in an 80°C water bath and stir for 13 hours to obtain a mixed system;

[0026] (2) Stir and soak the attapulgite in hydrochloric acid at 70°C for 4 hours, then wash it several times with distilled water until the pH value of the washing solution is 5.0, then dry it at 90°C, and then grind and sieve it to obtain acidified attapulgite;

[0027] (3) Weigh 2.6676g of acidified attapulgite into the mixing system, continue to stir for 20 hours, and evaporate to obtain a wet gel, then put the wet gel in a drying oven at 80°C, and dry it to form a dry gel. The gel was placed in a muffle furnace, heated to 700°C at a heating rate of 2°C / min, kept for calcination for 2 hours, and finally ground to obtai...

Embodiment 3

[0029] (1) Weigh 0.8892g of cerium nitrate, 4.1375g of ferric nitrate, 0.3480g of silver nitrate, 5.2547g of citric acid dissolved in 100ml of deionized water, then drop 6mL of ethylene glycol, and use sodium hydroxide solution Adjust its pH value to 12, place the mixed solution in a 90°C water bath and stir for 16 hours to obtain a mixed system;

[0030] (2) Stir and soak the attapulgite in hydrochloric acid at 80°C for 5 hours, then wash with distilled water several times until the pH value of the washing liquid is 7.0, stop washing, then dry at 100°C, and then grind and sieve to obtain acidified attapulgite;

[0031] (3) Weigh 4.5000g of acidified attapulgite and add it into the mixing system, continue to stir for 24 hours, and evaporate to obtain a wet gel, then put the wet gel in a 90°C drying oven, dry it to form a dry gel, and dry the dry gel The gel was placed in a muffle furnace, and calcined at 800°C at a heating rate of 2°C / min, kept for 2h, and finally ground to o...

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Abstract

The invention discloses a preparation method and an application of a cerium ferrite-silver-attapulgite Z-type heterojunction catalyst, and belongs to the field of catalysts. Firstly, cerium nitrate, ferric nitrate, silver nitrate and citric acid are weighed, added into deionized water and stirred, ethylene glycol is dropped, the pH (potential of hydrogen) value of solution is adjusted to be 8-12 by sodium hydroxide, stirring is performed under water-bath heating conditions, a mixed system is obtained after stirring, acidified attapulgite is added into the mixed system, stirred and volatilizedinto wet gel, dried into dry gel, finally calcined at high temperature and grinded to obtain a cerium ferrite-silver-attapulgite composite material, the cerium ferrite-silver-attapulgite nano-structure composite material is prepared by a one-step sol-gel method, silver serves as an electronic mediator, Z-type catalyst cerium ferrite-silver-attapulgite can be built, photo-induced electron-hole recombination is inhibited, the catalytic performance of the composite material can be improved, and the denitration sulfur-resistant activity of the catalyst is improved by Ce ions.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a preparation method of a cerium ferrite-silver-attapulgite Z-type heterojunction catalyst and its optical coupling denitrification application. Background technique [0002] In recent years, with the rapid development of modern industrialization and the extensive use of fossil fuels, the pollution of nitrogen oxides has become increasingly serious, which seriously threatens the ecological environment and human health, such as photochemical smog, acid rain, and solid particulate matter PM2. 5 and respiratory diseases, etc. Therefore, the control of nitrogen oxides is particularly urgent. [0003] Using the special energy band structure of semiconductors to generate electron holes under the excitation of sunlight to drive oxidation-reduction reactions to degrade pollutants as a new type of low-temperature and high-efficiency photocatalytic denitrification technology has become a hot spot in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/86B01D53/56
CPCB01D53/8628B01J23/894B01J35/39
Inventor 姚超夏建文李霞章左士祥严向玉刘文杰夏青
Owner JIANGSU HUAYUAN MINING
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