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Catalyst for treating escape of ammonia gas as well as preparation method and application of catalyst

A technology of catalysts and composite catalysts, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems that it is difficult to meet the ultra-low emission standards of NH3, cannot be used directly, and the temperature of flue gas is low. Ease of large-scale production, wide application range, and high N2 selectivity

Pending Publication Date: 2022-06-03
北京方信立华科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for non-power industries, the flue gas has the characteristics of low temperature and complex composition, and the post-denitration process route is usually adopted. The flue gas at the outlet of the denitrification reactor is directly discharged into the chimney, and the NH 3 The escape phenomenon is relatively serious, improving the performance of SCR catalysts, optimizing process layout and operation management can reduce NH 3 escape concentration
However, for some denitrification projects, it is still difficult to achieve NH 3 ultra-low emission standard
[0003] Currently, NH is being developed by some companies 3 selective oxidation to N 2 The catalyst is only used in the exhaust gas treatment system of diesel vehicles. The design working temperature of the catalyst is 280-450°C. The denitrification temperature in the non-electric power industry is lower, below 250°C. The NH in the exhaust gas treatment system of diesel vehicles cannot be used directly. 3 escape catalyst

Method used

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  • Catalyst for treating escape of ammonia gas as well as preparation method and application of catalyst
  • Catalyst for treating escape of ammonia gas as well as preparation method and application of catalyst
  • Catalyst for treating escape of ammonia gas as well as preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Prepare 0.02mol / L of H 2 PtCl 6 solution, pour 80 mL of deionized water into a beaker, and then add anatase TiO 2 20g, turn on magnetic stirring, set the speed to 500r / min, stir for 20min, and then add H 2 PtCl 6 Solution 5.13mL, Co(NO 3 ) 6H 2 O 6.98g, continue to stir for 3h; transfer the beaker to a spray dryer and dry at 120°C for 7h; grind the dried powder and place it in a muffle furnace, at a heating rate of 5°C / min in air The temperature was raised from room temperature to 500 °C under the atmosphere, and the powder was calcined for 3 hours. The powder obtained after calcination was the treated NH 3 escape catalyst.

Embodiment 2

[0037] Prepare 0.02mol / L of H 2 PtCl 6 solution, pour 80 mL of deionized water into a beaker, and then add CeO 2 20g, turn on magnetic stirring, set the speed to 500r / min, stir for 20min, and then add H 2 PtCl 6 Solution 5.13mL, Co(NO 3 ) 6H 2O 6.98g, continue to stir for 3h; transfer the beaker to a spray dryer and dry at 120°C for 5h; grind the dried powder and place it in a muffle furnace, at a heating rate of 5°C / min in air The temperature was raised from room temperature to 500 °C under the atmosphere, and calcined for 3 hours. The powder after calcination was treated with NH 3 escape catalyst.

Embodiment 3

[0039] Prepare 0.02mol / L of H 2 PtCl 6 solution, pour 80 mL of deionized water into a beaker, and then add Al 2 O 3 20g, turn on magnetic stirring, set the speed to 500r / min, stir for 20min, and then add H 2 PtCl 6 Solution 5.13mL, Co(NO 3 ) 6H 2 O 6.98g, continue to stir for 3h; transfer the beaker to a spray dryer and dry at 120°C for 6h; grind the dried powder and place it in a muffle furnace, at a heating rate of 5°C / min in the air The temperature was raised from room temperature to 500 °C under the atmosphere, and calcined for 3 hours. The powder after calcination was treated with NH 3 escape catalyst.

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PUM

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Abstract

The invention belongs to the technical field of atmospheric treatment, and discloses a catalyst for treating ammonia escape, and the catalyst is a Pt-X / Y type composite catalyst; wherein Pt is used as an active component; x is used as a regulator, and X is one or a mixture of more of Co3O4, Fe2O3, MnO2 and CuO; y is used as a carrier, and Y is any one of TiO2, CeO2, Al2O3 and SnO2 or a 2-4-membered composite oxide of TiO2, CeO2, Al2O3 and SnO2. The prepared catalyst can be used for treating residual NH3 after denitration reaction into harmless N2, has higher N2 selectivity and wider application range, and can meet the requirement of ultralow emission of NH3.

Description

technical field [0001] The invention relates to the technical field of atmospheric treatment, and more particularly to a catalyst for treating ammonia gas escape from denitrification systems in non-power industries. Background technique [0002] In recent years, with the promotion of ultra-low emissions in thermal power, steel and other industries in my country, NOx emission standards have also reached new heights. SCR technology is the main technical means to control NOx. The principle is that under the action of catalyst, NH 3 with NOx, O 2 react to form N 2 and H 2 O, in the actual use process, NH inevitably occurs due to uneven airflow distribution, flue gas fluctuations and other reasons. 3 escape. The power industry belongs to the front-end denitrification, and after the back-end desulfurization and dust removal process, the ammonia escape is not serious. However, for the non-power industry, the flue gas has the characteristics of low temperature and complex comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/656B01D53/86B01D53/56B01D53/58B01D53/90
CPCB01J23/8913B01J23/894B01J23/6562B01D53/8628B01D53/8634B01D53/90B01D2251/2062B01D2257/404B01D2258/0283B01D2257/406Y02A50/20
Inventor 李凯吴锐朱红太
Owner 北京方信立华科技有限公司
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