Denitration and dioxin removal composite catalyst and preparation method

A composite catalyst and a technology for removing dioxins, which are applied in the field of composite catalyst and preparation for denitration and dedioxin removal of flue gas of iron and steel sintering machines, can solve the problems of inability to synergistically remove dioxins, poor water resistance, poor denitration performance, etc. To achieve the effect of denitrification performance, water and sulfur resistance improvement, operating cost reduction, high efficiency and selectivity

Active Publication Date: 2018-11-20
江苏浩日朗环保科技有限公司
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  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a composite catalyst for denitrification and dioxin removal of steel sintering machine flue gas and its preparation method, which can solve the problems of poor denitrification performance under low temperature conditions, poor sulfur resistance and water resistance, etc. Reducing agents and the problem of inability to synergistically remove dioxins

Method used

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  • Denitration and dioxin removal composite catalyst and preparation method
  • Denitration and dioxin removal composite catalyst and preparation method
  • Denitration and dioxin removal composite catalyst and preparation method

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preparation example Construction

[0043] The preparation method of the palladium layer material in the inner layer is to add γ-Al 2 o 3 , γ-Al 2 o 3 Specific surface area ≥ 300m 2 / g, the pressure of the reactor is 2-10MPa, sequentially add palladium oxide, manganese dioxide, cerium oxide, zirconium oxide precursor palladium nitrate, manganese nitrate, cerium nitrate, zirconium nitrate. γ-Al 2 o 3 , palladium nitrate, manganese nitrate, cerium nitrate, and zirconium nitrate are added in a mass ratio of 40-60:1-5:10-20:10-40:10-30, and can also be added in the form of acetate or oxalate .

[0044] Specifically, first, add γ-Al to the reactor 2 o 3 Heating, pressurizing and stirring are carried out, the stirring speed is 50-300r / min, the temperature is 40-50°C, the pressure is 3-10MPa, and the stirring time is 0.1-0.5h.

[0045] Afterwards, after reducing the pressure to standard atmospheric pressure, slowly and uniformly add palladium nitrate for 0.3-0.5 hours, pressurize to 3-10 MPa after the addition...

Embodiment 1

[0073] Catalyst specification 150mm×150mm×400mm, 4 holes / cm 2 , the mass concentration of palladium oxide is 0.2%, and the mass concentration of rhodium oxide is 0.1%.

Embodiment 2

[0075] Catalyst specification 150mm×150mm×400mm, 4 holes / cm 2 , the mass concentration of palladium oxide is 0.1%, and the mass concentration of rhodium oxide is 0.1%.

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Abstract

The invention discloses a denitration and dioxin removal composite catalyst applied to flue gas of a steel sintering machine and a preparation method thereof. The flue gas contains CO; the catalyst comprises a carrier, and a dioxin removing inner layer and a denitrating outer layer which are sequentially loaded onto the carrier, wherein the dioxin removing inner layer comprises a first active substance for removing dioxin; the denitrating outer layer comprises a second active substance for removing nitrogen oxide; the CO in the flue gas reacts with the second active substance and can be used as a reducing agent for removing the nitrogen oxide. The denitration and dioxin removal composite rear earth-based catalyst prepared by the preparation method provided by the invention, has greatly improved denitration performance and water and sulfur resistance under a low-temperature working condition of the steel sintering machine; the CO in the flue gas is used as the reducing agent, and NH3 isnot required to be sprayed, so that the operating cost is reduced; efficient selectivity for dioxin removal is achieved.

Description

technical field [0001] The application relates to the field of preparation of flue gas denitrification catalysts for iron and steel sintering machines, in particular to a composite catalyst for denitrification and dioxin removal of flue gas from iron and steel sintering machines and a preparation method. Background technique [0002] The flue gas emission characteristics of iron and steel sintering machines are mainly characterized by low temperature, CO volume concentration as high as about 1%, alkali metals and dioxins in the dust, etc. 3 -SCR series low-temperature catalysts can no longer fully adapt to the coordinated removal of nitrogen oxides and dioxins in steel sintering machines. [0003] At present, some scholars in the market are also developing low-temperature denitrification catalysts for steel sintering machines. However, due to the special components in the flue gas, after the catalyst has been used for a period of time, the accumulation of sulfate will cause ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01D53/86B01D53/56B01D53/70
CPCB01D53/8628B01D53/8662B01D2257/206B01D2258/0283B01J23/002B01J23/6562B01J2523/00B01J2523/31B01J2523/3712B01J2523/48B01J2523/72B01J2523/824
Inventor 施雅琼张现龙
Owner 江苏浩日朗环保科技有限公司
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