Amino compound-supported composite denitration catalyst, and preparation method and application thereof

An amine-based compound, denitration catalyst technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low activity, low melamine solubility, and frequent catalyst regeneration. and other problems, to achieve the effect of improving selective catalytic reduction, high denitration efficiency and selectivity, and optimizing electronic composition

Active Publication Date: 2017-09-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Obviously, the low-temperature urea-SCR activity of the above-mentioned Ni and Ce metal oxides is still low; and the solubility of melamine in water is extremely low, resulting in its content in the catalyst being less than 1%, resulting in the frequent regeneration of the catalyst
However, composite catalysts with high-efficiency denitrification active metal oxide active components and reductant components with a wide reaction temperature range are among the supported denitration catalysts that use solid nitrogen-containing compounds as reductants Among the research results, there is no public report yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 0.5 g of carbon airgel with a particle size of 0.2-2.0 mm, and use the equal volume impregnation method to impregnate the carbon airgel in a mixed solution of manganese acetate and cerium nitrate, wherein the molar ratio Mn / (Mn+Ce) =0.5, the total concentration of binary metals is 0.05mol / L. After immersion for 6 hours, the samples were dried in an oven at 80°C for 48 hours, and then heated to 350°C for 6 hours at a rate of 1°C / min. Finally, using the equal volume impregnation method, the above sample was immersed in 1.67mol / L urea solution (25°C) for 6h and then dried in an oven at 80°C for 24h to prepare the loaded urea and Mn-Ce binary metal oxide compound denitrification catalyst.

[0045] Pack the prepared composite catalyst in a fixed-bed reactor, raise the temperature to 0°C for ventilation, and the simulated flue gas composition is: 50ppm NO, 1vol.%O 2 , N 2 It is balance gas, operated at normal pressure, with a space velocity of 3000h -1 . The test r...

Embodiment 2

[0047] Take activated carbon fiber 0.5g, adopt equal volume impregnation method, activated carbon fiber is impregnated in the mixed solution of manganese nitrate and copper sulfate, wherein molar ratio Mn / (Mn+Cu)=0.2, binary metal total concentration is 0.18mol / L. After immersion for 10 h, the sample was dried in an oven at 100 °C for 20 h, and then heated to 500 °C for 5 h at a rate of 2 °C / min for calcination. Finally, using the equal-volume impregnation method, the above-mentioned samples were immersed in 0.73mol / L dicyandiamide solution (60°C) for 12h and then dried in an oven at 100°C for 30h to prepare loaded dicyandiamide and Mn-Cu Composite denitration catalyst of binary metal oxide.

[0048] Pack the prepared composite catalyst in a fixed-bed reactor, raise the temperature to 30°C for ventilation, and the simulated flue gas composition is: 500ppm NO, 10vol.%O 2 , N 2 It is balance gas, operated at normal pressure, with a space velocity of 6000h -1 . The test res...

Embodiment 3

[0050] Weigh 0.5 g of active coke with a particle size of 0.2 to 2.0 mm, and use an equal-volume impregnation method to impregnate the active coke in a mixed solution of manganese sulfate and chromium chloride, wherein the molar ratio Mn / (Mn+Cr)=0.7, The total concentration of binary metals is 1.54mol / L. After immersion for 24 hours, the samples were dried in an oven at 110°C for 36 hours, and then heated to 700°C for 3 hours at a rate of 5°C / min. Finally, using the equal-volume impregnation method, the above-mentioned samples were immersed in 0.86mol / L dicyandiamide solution (80°C) for 6h and then dried in an oven at 110°C for 26h to prepare loaded dicyandiamide and Mn-Cr Binary Metal Oxide Composite Denitration Catalyst

[0051] Pack the prepared composite catalyst in a fixed-bed reactor, raise the temperature to 100°C for ventilation, and the simulated flue gas composition is: 1000ppm NO, 4vol.%O 2 , N 2 It is balance gas, operated at normal pressure, and the space speed...

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Abstract

The invention relates to an amino compound-supported composite denitration catalyst, and a preparation method and an application thereof. The catalyst is prepared from 50-90 wt% of a carrier, 5-25 wt% of metal oxide and 5-25 wt% of an amino compound. The method comprises the following steps: weighing the carrier and a metal inorganic salt precursor, impregnating the carrier in an aqueous solution of a metal inorganic salt through an isopyknic impregnation technology, stirring the obtained solution, drying the stirred solution, introducing nitrogen, calcining the dried solution, weighing and dissolving the amino compound, impregnating the obtained calcined solid sample in the aqueous solution of the amino compound, and standing and drying the obtained solution to obtain the composite denitration catalyst. A fixed bed reactor is filled with the prepared composite catalyst, and normal pressure smoke is introduced and is denitrated. The catalyst has the characteristics of good economic property, energy saving, environmental protection, high denitration efficiency, and realization of repeated use of the recovered support amino compound, and is extremely suitable for the field of low temperature denitration of fixed sources.

Description

technical field [0001] The invention relates to a denitration catalyst and its preparation and application method, in particular to a composite denitration catalyst loaded with an amine compound and its preparation method and application. Background technique [0002] NO x As one of the main pollutants in the atmosphere, it can cause a series of environmental problems such as acid rain, photochemical smog, ozone layer destruction and greenhouse effect, and pose a huge threat to human health and the ecological environment. At present, the selective catalytic reduction reaction (SCR) method is widely used in the industry, and V 2 o 5 -WO 3 / TiO 2 as catalyst, with NH 3 As a reducing agent, it removes nitrogen oxides in flue gas at a temperature range of 300-400 °C. However, this technology has some obvious disadvantages, such as the strong corrosiveness of the reducing agent liquid ammonia or ammonia water, which requires high pipeline equipment; NH 3 It is difficult to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/32B01J31/34B01J31/38B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/206B01D2251/2067B01D2255/2065B01D2255/20715B01D2255/2073B01D2255/20761B01D2255/20784B01D2258/0283B01J31/0249B01J31/0251B01J31/32B01J31/34B01J31/38
Inventor 乔文明李军殷迪王际童龙东辉凌立成
Owner EAST CHINA UNIV OF SCI & TECH
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