Catalyst for flue gas denitrification and preparation method of catalyst

A catalyst and denitrification technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of high initial installation cost and replacement cost of SCR catalyst, environmental and human damage, and catalyst loss To achieve excellent oxidation-reduction performance, improve comprehensive ability, and good anti-sulfur poisoning ability

Inactive Publication Date: 2017-05-31
JILIN ELECTRIC POWER RES INST LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the SCR denitrification catalysts used in coal-fired power plants in my country are vanadium-tungsten-titanium series, most of which need to be imported or imported from foreign technology, so the initial installation cost and replacement cost of SCR catalysts are very high
However, due to the high denitrification temperature (300-400°C), the SCR device can only be arranged between the economizer and the air preheater
However, there is a large amount of fly ash in the flue gas, which contains alkali metals, arsenic, mercury and other substances, which will inevitably corrode and poison the catalyst, resulting in the catalyst being easily deactivated and having a short service life. Catalyst poisoning leads to life attenuation; at the same time, vanadium components in vanadium-tungsten-titanium series catalysts are easy to lose, which will cause serious damage to the environment and human body

Method used

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  • Catalyst for flue gas denitrification and preparation method of catalyst
  • Catalyst for flue gas denitrification and preparation method of catalyst
  • Catalyst for flue gas denitrification and preparation method of catalyst

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preparation example Construction

[0045] The present invention also provides a method for preparing a catalyst for flue gas denitrification, comprising the following steps:

[0046] A) mixing soluble iron source, soluble cerium source, soluble nickel source, titanium dioxide and water, after dispersing, drying and grinding to obtain intermediate powder;

[0047] B) Calcining the intermediate powder obtained in the above steps and grinding again to obtain a catalyst for flue gas denitrification.

[0048] The selection range and optimization principles of the multi-component metal oxide nanomaterials in the present invention are consistent with the selection ranges and optimization principles of the aforementioned catalyst nanomaterials for flue gas denitrification, and will not be repeated here. repeat.

[0049] The invention firstly mixes soluble iron source, soluble cerium source, soluble nickel source, titanium dioxide and water, after dispersing, drying and grinding to obtain intermediate powder.

[0050]...

Embodiment 1

[0067] Preparation of Fe with a molar ratio of 2:2:1:10 2 o 3 -CeO 2 -NiO / TiO 2 Multi-element metal composite oxide

[0068] Dissolve 2.02g of ferric nitrate, 2.17g of cerium nitrate and 1.79g of nickel nitrate in 40mL of deionized water, add 2g of titanium dioxide powder, mix, stir vigorously for 1 hour, then ultrasonically mix for 5 hours, put it in an oven at 105°C for drying After 4 hours, after fully grinding, put it into a muffle furnace, calcinate at 550°C for 1.5 hours in an air atmosphere, and grind it into powder to obtain Fe 2 o 3 -CeO 2 -NiO / TiO 2 Multiple metal oxides.

[0069] The multi-element metal oxide prepared in Example 1 of the present invention was characterized.

[0070] see figure 1 , figure 1 SEM electron micrograph of the multinary metal oxide powder prepared in Example 1 of the present invention.

[0071] see figure 2 , figure 2 EDS energy spectrum of the multinary metal oxide powder prepared in Example 1 of the present invention.

[...

Embodiment 2

[0085] Preparation of Fe with a molar ratio of 0.5:0.1:4:10 2 o 3 -CeO 2 -NiO / TiO 2 Multiple metal oxides

[0086] Dissolve 0.169g of ferric chloride, 0.081g of cerium chloride and 2.56g of nickel chloride in 30mL of deionized water, add 1g of titanium dioxide powder, mix, stir vigorously for 2 hours, then ultrasonically mix for 3 hours, put in an oven at 95°C The seeds were dried for 6 hours, fully ground, put into a muffle furnace, calcined at 450°C for 1 hour in an air atmosphere, and ground into powder to obtain Fe 2 o 3 -CeO 2 -NiO / TiO 2 Multiple metal oxides.

[0087] The application detection of the multi-component metal oxide nanomaterial prepared in Example 2 of the present invention was carried out.

[0088] Method is with embodiment 1.

[0089] It can be seen from the test results that the multi-element metal oxide prepared by the present invention basically exhibits good anti-SO 2 and H 2 O poisoning ability. Especially above 250°C, due to the higher ca...

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Abstract

The invention provides a catalyst for flue gas denitrification. The catalyst is multi-component metal oxide comprising Fe2O3, CeO2, NiO and TiO2. The Fe2O3-CeO2-NiO/TiO2 multi-component metal oxide serving as an SCR (selective catalytic reduction) flue gas denitrification catalyst has the advantages of high resistance to H2O and SO2 poisoning, low denitrification cost and the like and also has higher thermal stability, wider temperature window and better low-temperature denitrification activity.

Description

technical field [0001] The invention relates to the technical field of multi-component metal oxide functional materials, and relates to a catalyst for flue gas denitrification and a preparation method thereof, in particular to a catalyst for SCR flue gas denitrification and a preparation method thereof. Background technique [0002] Coal plays an absolute leading role in my country's national economic construction, and has long accounted for close to or even higher than 70% of my country's total primary energy consumption. In my country's coal consumption, 80% of coal is used as power coal, which is directly used for combustion to generate heat and power. However, coal is a low-grade fossil fuel, and there are a large amount of pollutants such as sulfur oxides, nitrogen oxides, and carbon dioxide in the combustion flue gas. According to statistics: CO, CO emitted from coal combustion in my country 2 , SO 2 , NO X The proportions of dust and dust in total fuel combustion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/56
CPCB01J23/83B01D53/8628B01D2258/0283B01J23/002B01J2523/00B01J2523/842B01J2523/847B01J2523/3712B01J2523/47
Inventor 张丹姜英男张赩孙晔孟宪超李云飞孙伟义
Owner JILIN ELECTRIC POWER RES INST LTD
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