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Cerium-iron molecular sieve based catalyst with wide temperature range and preparation method thereof

A molecular sieve and catalyst technology, which is applied in the field of cerium-iron molecular sieve-based catalysts with a wide temperature range and its preparation, can solve the problems of dispersion and the influence of catalyst SCR performance in the existing state, and achieve good low-temperature denitrification activity, good application prospects, and low cost. low effect

Active Publication Date: 2020-07-24
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersion degree and existence state of the active metal species on the zeolite catalyst have a significant impact on the SCR performance of the catalyst.

Method used

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  • Cerium-iron molecular sieve based catalyst with wide temperature range and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 65g of pure water, add 1.5g of NaOH, 0.6g of sodium metaaluminate, and 23.7g of silica sol, stir and mix evenly to obtain solution A, take 50g of pure water, add 3.2g of ferric nitrate, and stir to obtain solution B, slowly dissolve B solution Add solution A, stir and mix for 1 hour with magnetic force, then add hexamethyleneimine and continue to stir and age for 2 hours. Rotate and crystallize for 7 days. The crystallized product was suction filtered, washed, dried, ground, and roasted to obtain an iron-doped Na-type MCM-22 sample. Under the condition of water bath at 80°C, Na-type MCM-22 was ion-exchanged with 1mol / L ammonium nitrate solution, and after suction filtration, washing, drying, grinding, and roasting, Fe-MCM-22 with an iron content of 4.9% was obtained. Sample designation: 4.9Fe-Al-MCM-22.

Embodiment 2

[0034] Take 0.06g of cerium nitrate hexahydrate, dissolve it in 8g of water, take 2g of 4.9Fe-MCM-22 sample, disperse in the above solution, stir at room temperature for 24h, dry and grind to obtain 1Ce / 4.9Fe with a Ce loading of 1%. - MCM-22 catalyst.

Embodiment 3

[0036] Take 0.18g of cerium nitrate hexahydrate, dissolve it in 8g of water, take 2g of 4.9Fe-MCM-22 sample, disperse in the above solution, stir at room temperature for 24h, dry and grind to obtain 3Ce / 4.9Fe with a Ce loading of 3%. - MCM-22 catalyst.

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Abstract

The invention discloses a cerium-iron molecular sieve based catalyst with a wide temperature range and a preparation method thereof. A novel MCM-22 molecular sieve is used as a catalyst, the synthesischaracteristics of the molecular sieve are utilized, Fe is introduced in situ in the hydrothermal synthesis process to serve as an active site of an NH3-SCR reaction, an Fe-MCM-22 catalyst is obtained, then an active component Ce is introduced through an isopyknic impregnation method, and the bimetal supported Ce / Fe-MCM-22 catalyst is prepared and used for removing nitrogen oxide through NH3-SCR.The Fe-MCM-22 catalyst prepared by the method has the advantages that the active Fe component is uniformly dispersed, the low-temperature catalytic activity of the catalyst is obviously improved, andthe temperature window is widened; the catalyst has good dispersibility and redox property and is high in activity and is a Ce / Fe-MCM-22 catalyst which is high in activity and wide in active temperature interval.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide control in environmental protection, in particular to a preparation method and application of Fe and Ce composite molecular sieve catalysts, which are used for ammonia selective catalytic reduction of nitrogen oxides, and are suitable for diesel engines, lean-burn gasoline engines and industrial production NO under oxygen enriched conditions x Purification, such as NO in the flue gas of coal-fired power plants, smelters or oil refineries x deal with. Background technique [0002] Nitrogen oxides (NO x , mainly NO and NO 2 ) is an important class of air pollutants, which will lead to the formation of acid rain, photochemical smog, etc., and has biological respiratory toxicity, which will cause significant harm to human health and the ecological environment. NO x The main sources of flue gas include stationary sources of industrial flue gas, such as coke oven flue gas, flue gas emitted b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J37/10B01D53/86B01D53/56
CPCB01J29/7676B01J37/10B01D53/8628B01J2229/20B01J2229/40B01D2258/0283B01D2251/2062
Inventor 吴晓琴彭罡陈佳玲郭立
Owner WUHAN UNIV OF SCI & TECH
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