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Pretreatment method for improving activity of NH3-SCR catalyst

A technology of NH3-SCR and catalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. It can solve problems such as safety and equipment corrosion, and achieve great application potential , With the effects of NO conversion rate and N2 selectivity, high NO conversion rate and N2 selectivity

Active Publication Date: 2021-08-31
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods inevitably have problems such as safety and equipment corrosion. Therefore, it is particularly important to develop efficient, convenient, safe and low-energy catalyst pretreatment methods in industrial practice.

Method used

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  • Pretreatment method for improving activity of NH3-SCR catalyst
  • Pretreatment method for improving activity of NH3-SCR catalyst
  • Pretreatment method for improving activity of NH3-SCR catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Accurately measure 0.01mol Ce(NO 3 ) 3 ·6H 2 O and 0.01mol Fe 2 (NO 3 ) 3 9H 2 O, respectively dissolved in 50mL distilled water and magnetically stirred at room temperature for 0.5h, then dropwise added 25%wt ammonia water to the solution to ensure that the pH of the solution was greater than or equal to 10.0, then magnetically stirred at room temperature for 3h to make the precipitation complete, Aged for 3 hours, filtered, washed with deionized water for 3 times, dried in an oven at 100°C for 12 hours, ground evenly, and then calcined at 400°C for 4 hours in an air atmosphere in a muffle furnace to obtain FeCeO x powder. Take 0.01 mol of roasted powder sample, 0.01 mol of citric acid and 0.005 mol of oxalic acid, dissolve in 50 mL of distilled water and stir magnetically at room temperature for 3 hours, dry at 120°C oil bath for 6 hours, and dry in an oven at 120°C 12h, grind evenly, and then bake at 400°C for 4h in an air atmosphere in a muffle furnace. The ...

Embodiment 2

[0027] Apply the iron-cerium composite oxide catalyst prepared in Example 1 to NH 3 -SCR reaction, the specific reaction conditions are as follows: The catalytic reaction test is carried out in a fixed-bed continuous flow quartz reactor. The particle size of the catalyst is 40-60 mesh, and the dosage is 200 mg. The reaction gas composition is: 500ppm NO, 500ppm NH 3 ,5%O 2 ,N 2 As a balance gas, the gas space velocity in the reaction is 60,000 mL·mg –1 h –1 . Before the reaction, the catalyst needs to use high-purity N 2 Purge at 200°C for 20 minutes. Catalytic reactions were carried out at 100-400°C, and activity data were collected after the reaction reached equilibrium. The product was detected and analyzed by Thermofisher IS10 FTIR, NO conversion rate and N 2 Selectivity is calculated by the following formula:

[0028]

[0029]

[0030] The iron-cerium composite oxide catalyst prepared by the present invention passes through X-ray diffraction (XRD), ammonia...

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Abstract

The invention discloses a pretreatment method for improving the activity of an NH3-SCR catalyst, and belongs to the technical field of catalysts. The specific process of the method comprises the following steps: preparing FeCeOx powder by adopting a coprecipitation method, then dissolving the FeCeOx powder, citric acid and oxalic acid in distilled water, uniformly conducting stirring at room temperature, and finally conducting drying and roasting in an air atmosphere to prepare the high-performance medium and low temperature NH3-SCR catalyst. The existing form of active species on the surface of the original catalyst is changed by utilizing a citric acid pretreatment mode, the acidity of the catalyst is improved, the oxidation-reduction performance of the original catalyst is adjusted, the NO conversion rate and N2 selectivity of the original catalyst are remarkably improved, and the catalyst has a wide application prospect in the field of medium-temperature NH3-SCR catalytic denitration in the non-electric industry.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a method for increasing NH 3 - Pretreatment method for SCR catalyst activity. Background technique [0002] my country's air pollutants such as nitrogen oxides (NO x ) emission concentration requirements are getting lower and lower. However, due to the late development of my country's denitrification industry, the installation sequence of flue gas purification equipment is different from that of foreign countries. If the current commercial V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Catalyst (operating temperature > 300°C), the use efficiency of the catalyst will be reduced due to the mismatch of operating temperature (80-300°C). At the same time, V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 The active component of the catalyst V 2 o 5 It is very harmful to the human body and the environment, which is contrary to the concept of protecting the environment. At present, Fe and Ce elements hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J37/03B01J37/08B01J37/06B01D53/86B01D53/90B01D53/56
CPCB01J23/83B01J37/03B01J37/08B01J37/06B01J23/002B01D53/8628B01D53/90B01D2251/2062B01D2257/404B01D2258/06
Inventor 董林孙敬方杨钰垚赵勇刚仝庆汤常金
Owner NANJING UNIV
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