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Rare-earth heteropolyacid salt-doped iron-based catalyst and application of catalyst in flue gas denitration

A technology of iron-based catalysts and heteropoly acid salts, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high cost and operating temperature, environmental and human toxicity, active component vanadium Toxic and other problems, to achieve the effect of strong anti-sulfur poisoning ability, low investment and simple preparation method

Inactive Publication Date: 2014-08-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst is a commercial V 2 o 5 -WO 3 / TiO 2 , the catalyst has high denitrification activity, but its cost and operating temperature are high, and the device is placed before desulfurization and dust removal, which may easily cause sulfur poisoning and blockage of the catalyst, and the active component vanadium is poisonous, which is easy to cause poisoning to the environment and humans

Method used

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  • Rare-earth heteropolyacid salt-doped iron-based catalyst and application of catalyst in flue gas denitration
  • Rare-earth heteropolyacid salt-doped iron-based catalyst and application of catalyst in flue gas denitration
  • Rare-earth heteropolyacid salt-doped iron-based catalyst and application of catalyst in flue gas denitration

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Effect test

Embodiment 1

[0022] Example 1 Preparation of Rare Earth Heteropolyacid Salt Doped Iron-Based Catalyst

[0023] Rare earth heteropolyacid salt-doped iron-based catalyst, composed of rare earth heteropolyacid salt and iron oxide mechanically mixed, the mass ratio of rare earth heteropolyacid salt to iron oxide is 1:2, 1:3 or 1:4, including 5 kinds described in table 1. Its preparation method is as follows:

[0024] (1) Keggin structure rare earth phosphotungstate (LnPW 12 o 40 , Ln=Nd, Nd, Eu):

[0025] (1) Accurately weigh 8.964g (3.0mmol) of phosphotungstic acid, add 30ml 1+1 ethanol to dissolve it;

[0026] (2) Add excessive 10% rare earth nitrates under vigorous stirring at 75° C., and continue to react for 45 minutes; Salt);

[0027] (3) After the above reaction is completed, distill at normal pressure (remove ethanol and water, distill to 1 / 4 of the original volume), cool and crystallize naturally, filter, dry the filter cake at 120°C for 2h, and then roast at 300°C for 3h, namely...

Embodiment 2

[0030] Embodiment 2 Phosphotungstic acid rare earth gadolinium salt doped iron-based catalyst (NdPW 12 o 40 / Fe y o x(1:3) ) denitrification activity test

[0031] Catalytic activity was evaluated by figure 1 The device shown is complete. A fixed-bed reactor was used, and the catalyst was loaded into a quartz reaction tube with an inner diameter of 8 mm. Both ends were fixed with quartz wool, and placed in a tubular electric furnace to control the reaction temperature. The flue gas composition is simulated with cylinder gas, where NO x (NO+NO 2 ) concentration is 1050ppm, NH 3 The concentration is 1150ppm, O 2 The volume fraction is divided into 6%, and nitrogen is used as the balance gas. The total flow rate is 100ml / min, and the space velocity is 15000h -1 , each gas flow is controlled and regulated by a mass flow meter. NO and NO in the outlet gas 2 Content by TH-9905 type NO / NO 2 Analyzer determination. The reaction test temperature is in the range of 150-400...

Embodiment 3

[0033] Embodiment 3 Phosphotungstic acid rare earth europium salt doped iron-based catalyst (EuPW 12 o 40 / Fe y o x(1:3) ) denitrification activity test

[0034] Catalytic activity was evaluated by figure 1 The device shown is complete. NO in simulated flue gas x (NO+NO 2 ) concentration is 1050ppm, NH 3 The concentration is 1150ppm, O 2 The volume fraction is divided into 6%, and nitrogen is used as the balance gas. The total flow rate is 100ml / min, and the space velocity is 15000h -1 , The reaction test temperature is 150 ~ 400 ℃. The conversion rate of nitrogen oxides was 44.7%, 69.9%, 99.6%, 100%, 100% and 85.6% respectively when the bed temperature was 150°C, 200°C, 250°C, 300°C, 350°C and 400°C.

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Abstract

The invention discloses a rare-earth heteropolyacid salt-doped iron-based catalyst which is formed by mechanical mixing of rare-earth heteropolyacid salt and iron oxide, wherein mass ratio of rare-earth heteropolyacid salt to iron oxide is 1:2, 1:3 or 1:4; and rare-earth heteropolyacid salt is selected from Keggin structured rare-earth phosphotungstate. The rare-earth heteropolyacid salt-doped iron-based catalyst can be used in selective catalytic reduction of NOx and flue gas denitration. In specific application, ammonia gas is used as a reducing agent and mixed proportionally; and under conditions of a certain space velocity, nitrogen oxide concentration, reaction temperature and normal pressure and in the presence of oxygen, nitrogen oxide in flue gas is removed, and nitrogen oxide is converted to nitrogen. The catalyst provided by the invention has advantages of simple preparation method, no toxicity, no harm, no pollution, high catalytic activity, high stability, high denitration efficiency, high sulfur-resistance performance, simple processing equipment and little investment, and is suitable for industrial popularization.

Description

technical field [0001] The invention relates to a rare earth heteropoly acid salt-doped iron-based catalyst and a preparation method thereof, as well as its application in flue gas denitrification, belonging to the technical field of selective catalytic reduction. Background technique [0002] With the rapid development of my country's economy, nitrogen oxides (NOx) emitted into the natural environment due to fossil energy combustion x ) is gradually increasing, it is not only the main component of acid rain, but also the culprit of photochemical smog, which seriously endangers human health, damages the environment, and restricts the sustainable development of economy and society. Therefore, strengthening governance NO x Pollution is imminent. [0003] At present, the selective catalytic reduction of ammonia (NH 3 -SCR) to control the emission of nitrogen oxides. The catalyst is a commercial V 2 o 5 -WO 3 / TiO 2 , the catalyst has high denitrification activity, but i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/188B01D53/86B01D53/56
Inventor 王睿魏莹
Owner SHANDONG UNIV
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