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Denitrification catalyst with alkali metal-resistant, water-resistant and sulfur-resistant properties, preparation and application

A denitration catalyst and alkali metal technology are applied in the field of preparation of environment-friendly wide-temperature denitration catalysts, which can solve the problems of high biological toxicity, narrow temperature window, catalyst poisoning, etc., and achieve the effects of non-toxic effect, high selectivity and environmental friendliness.

Inactive Publication Date: 2019-01-25
DATANG NANJING ENVIRONMENTAL PROTECTION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the narrow temperature window and high biological toxicity of existing commercial vanadium-based catalysts, it is necessary to develop non-vanadium-based wide-temperature catalysts to expand the temperature range of catalysts, and at the same time make catalysts more environmentally friendly during the life cycle of use and scrap; Catalysts are susceptible to poisoning by alkali metals and other poisons, and it is necessary to develop a denitrification catalyst that is resistant to alkali metal poisoning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Catalyst preparation: Add 0.005 mol ferrous sulfate, 0.01 mol ferric chloride and 0.001 mol niobium oxalate to 200 mL deionized water in sequence, stir and dissolve to form a mixed solution; then add 10 g tungsten molecular sieve carrier to the above mixed solution, Stir and disperse; add 0.05 mol ammonia water and age for 1 hour; wash and separate the product, dry at 105°C for 12 hours, and calcinate at 350°C for 4 hours to obtain the finished catalyst.

[0024] 2. Catalyst performance test: Take 0.5 g of the prepared catalyst and put it into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube is 8 mm, and the simulated flue gas is composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 1000 ppm, NH 3 1000 ppm, O 2 3 %, airspeed 40,000 h -1 , the reaction temperature is 250-400 °C, and the reaction tail gas is detected online by Antaris IGS gas analyzer. Under the test conditions, the denitrification efficiency of the catalyst was stabl...

Embodiment 2

[0027] 1. Catalyst preparation: Add 0.006 mol ferrous sulfate, 0.01 mol ferric nitrate and 0.002 mol antimony acetate to 200 mL deionized water in sequence, stir and dissolve to form a mixed solution; then add 10 g tungsten molecular sieve carrier into the above mixed solution, stir Disperse; add 0.06 mol ammonia water and age for 1 hour; wash and separate the product, dry at 105°C for 12 hours, and calcinate at 400°C for 4 hours to obtain the finished catalyst.

[0028] 2. Catalyst performance test: Take 0.5 g of the prepared catalyst and put it into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube is 8 mm, and the simulated flue gas is composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 1000 ppm, NH 3 1000 ppm, O 2 3 %, airspeed 40,000 h -1 , the reaction temperature is 250-400 °C, and the reaction tail gas is detected online by Antaris IGS gas analyzer. Under the test conditions, the denitrification efficiency of the catalyst was stable ...

Embodiment 3

[0031] 1. Catalyst preparation: Add 0.008 mol ferrous chloride, 0.015 mol ferric chloride and 0.002 mol niobium oxalate to 200 mL deionized water in sequence, stir and dissolve to form a mixed solution; then add 8 g tungsten molecular sieve and 2 g molybdenum molecular sieve The carrier was added to the above mixture, stirred and dispersed; then 0.08 mol of ammonia water was added, and aged for 2 hours; the separated product was washed, dried at 105 °C for 24 h, and calcined at 400 °C for 6 hours to obtain the finished catalyst.

[0032] 2. Catalyst performance test: Take 0.5 g of the prepared catalyst and put it into a fixed-bed quartz tube reactor, the inner diameter of the quartz tube is 8 mm, and the simulated flue gas is composed of NO, NH 3 , O 2 and N 2 Composition, of which NO 1000 ppm, NH 3 1000 ppm, O 2 3 %, airspeed 40,000 h -1 , the reaction temperature is 250-400 °C, and the reaction tail gas is detected online by Antaris IGS gas analyzer. Under the test co...

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Abstract

The invention relates to a preparation method of an environment-friendly wide-temperature denitrification catalyst with alkali metal-resistant, water-resistant and sulfur-resistant properties and application. The catalyst is characterized in that one or more of tungsten molecular sieves or molybdenum molecular sieves are adopted as carriers, iron oxide are adopted as as and active component and one or more of niobium oxide or antimony oxide re adopted as as an assistant. The preparation method and the application have the advantages that compared with the traditional vanadium-based catalyst, the environment-friendly wide-temperature denitrification catalyst has a wider temperature window, has no toxic effect, is environmentally friendly, and simultaneously has good alkali metal-resistant metal, water-resistant and sulfur-resistant properties. The catalyst can tolerate the nitrogen-oxide flue-gas condition containing 0-500 mumol / g of alkali metal / alkaline earth metal, 0-2000 mg / m<3> ofSO2 and 5%-20% of H2O simultaneously, under the conditions that the temperature is 250-400 DEG C and the air speed is 5,000-100,000 h<-1>, the denitration efficiency is stabilized to be 90% or more,and selectivity of N2 is higher than 95%, so that the environment-friendly wide-temperature denitrification catalyst is especially applicable to exhausting control of the nitrogen oxide in flue gas from thermal power, glass, steel and coking furnaces and the like.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a preparation method and application of an environment-friendly wide-temperature denitrification catalyst with anti-alkali metal and anti-water and anti-sulfur properties. Background technique [0002] Since the 21st century, with the continuous improvement of my country's productivity level, the scale of energy development and utilization has also increased day by day, resulting in increasingly severe environmental pollution problems, and the sustainable development of energy and the environment has been highly valued. According to the statistics of my country's energy consumption structure in recent years, my country's energy structure has gradually formed a coordinated and complementary system of various energy sources dominated by coal. However, overall, coal will still occupy the total energy consumption for a long period of time. The largest proportion in . Du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/86B01D53/56
CPCB01D53/9413B01D2258/0283B01J23/888
Inventor 王虎唐幸福纵宇浩陈俊逍陈雅欣李超江晓明
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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