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Non-toxic medium-high temperature alkali-resistant metal denitration catalyst and preparation method and application thereof

A denitration catalyst, medium and high temperature technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of biological toxicity, susceptibility to alkali metal poisoning, etc.

Inactive Publication Date: 2018-04-17
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a non-toxic medium-high temperature alkali metal denitrification catalyst and its preparation method and application, and solve the problems of traditional vanadium titanium catalysts with biological toxicity and susceptibility to alkali metal poisoning, etc. NOx emission control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1 preparation of catalyst:

[0019] (1) Add 0.01 mol of cerous nitrate hexahydrate and 0.04 mol of ferric nitrate nonahydrate to 100 mL of deionized water in sequence, stir well to dissolve, and then add 10 g of TiO 2 , stir evenly, then add 10mL 25% ammonia water, fully stir the precipitate, filter, wash and dry;

[0020] (2) Add 0.001 mol of niobium oxalate and 0.001 mol of ammonium metatungstate to 200 mL of deionized water in sequence, stir and dissolve to form a mixed solution;

[0021] (3) Add the precipitate in step (1) to the solution in step (2), stir and evaporate to dryness at 100°C;

[0022] (4) The evaporated product was collected and calcined at 500°C for 3 hours to obtain the finished catalyst.

[0023] 2. Catalyst performance test: 0.5 g of the prepared catalyst was put into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube was 0.8 cm, and the simulated flue gas was composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 500...

Embodiment 2

[0027] 1. Preparation of catalyst:

[0028] (1) Add 0.001mol of nickel nitrate hexahydrate and 0.04mol of iron nitrate nonahydrate to 100 mL of deionized water in turn, stir and dissolve, then add 10g of TiO 2 , stir evenly, then add 10mL 25% ammonia water, fully stir the precipitate, filter, wash and dry;

[0029] (2) Add 0.001mol of niobium oxalate and 0.004mol of ammonium heptamolybdate to 200 mL of deionized water in sequence, stir and dissolve to form a mixed solution;

[0030](3) Add the precipitate in step (1) to the solution in step (2), stir and evaporate to dryness at 100°C;

[0031] (4) The evaporated product was collected and calcined at 550°C for 3 hours to obtain the finished catalyst.

[0032] 2. Catalyst performance test: 0.5 g of the prepared catalyst was put into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube was 0.8 cm, and the simulated flue gas was composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 500 ppm, NH 3 500 ...

Embodiment 3

[0036] 1. Preparation of catalyst:

[0037] (1) Add 0.001mol nickel nitrate hexahydrate, 0.04mol ferric nitrate nonahydrate, and 0.005mol cerium chloride to 100 mL deionized water in sequence, stir and dissolve, then add 10g TiO 2 , stir evenly, then add 12mL 25% ammonia water, fully stir the precipitate, filter, wash and dry;

[0038] (2) Add 0.001mol of ammonium heptamolybdate and 0.004mol of ammonium metatungstate to 200 mL of deionized water in turn, stir and dissolve to form a mixed solution;

[0039] (3) Add the precipitate in step (1) to the solution in step (2), stir and evaporate to dryness at 100°C;

[0040] (4) The evaporated product was collected and calcined at 600°C for 3 hours to obtain the finished catalyst.

[0041] 2. Catalyst performance test: 0.5 g of the prepared catalyst was put into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube was 0.8 cm, and the simulated flue gas was composed of NO, NH 3 , O 2 and N 2 Composition, of whic...

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Abstract

The invention belongs to the technical field of atmospheric pollution control, and particularly relates to a non-toxic medium-high temperature alkali-resistant metal denitration catalyst and a preparation method and application thereof. The metal denitration catalyst takes titanium dioxide as a carrier, takes one or multiple of cerium oxide, ferric oxide and nickel oxide as active ingredients, andtakes one or multiple of niobium oxide, molybdenum oxide and tungsten oxide as accessory ingredients. Under the condition of a temperature of 300-400 DEG C and space velocity of 6000-100000h<-1>, thedenitration efficiency of the denitration catalyst is stabilized to be 95% or more, N2 selectivity is higher than 92%, and is still kept to be 90% or more under nitrogen oxide which contains 0-3000mg / m<3> of SO2 and 5-20% of H2O, and N2 selectivity is higher than 90%. The denitration catalyst has high sulfur-resistance waterproof ability, the activity of the catalyst is almost constant after thecatalyst loads 0-400mu mol / g of alkali metal, and the denitration catalyst is especially suitable for the nitrogen oxide discharge control of the smoke of power station boilers and the like.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a non-toxic, medium-high temperature and alkali metal denitrification catalyst and a preparation method and application thereof. Background technique [0002] At present, the situation of my country's atmospheric environment is very severe. The phenomenon of atmospheric haze in some regions and cities is prominent, and the discharge of major pollutants in many regions exceeds the environmental capacity. In the case that traditional soot pollution has not been controlled, ozone, fine particulate matter (PM 2.5 ) and acid rain, etc., have become increasingly prominent regional complex air pollution. The phenomenon of heavy air pollution in the region has become widespread and the frequency of occurrence is increasing, which seriously restricts the sustainable development of social economy and threatens the health of the people. The emission of major air p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J23/887B01D53/56B01D53/86
CPCB01J23/888B01D53/8628B01J23/8877B01J23/8885B01J37/035B01J37/08
Inventor 唐幸福陈俊逍高佳逸
Owner FUDAN UNIV
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