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Rare earth vanadate SCR denitration catalyst and preparation method of same

A denitration catalyst and rare earth vanadate technology are applied in the field of rare earth vanadate catalyst and its preparation, which can solve the problems of reduced denitration performance, catalyst deactivation and the like, so as to reduce pollution, inhibit sintering and crystal transformation, and improve heat The effect of stability

Inactive Publication Date: 2017-10-24
LONGYAN ZIJIN INNOVATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under high temperature conditions, conventional catalysts are prone to NH 3 Oxidation, V 2 o 5 Burnout, TiO 2 Crystal transformation and catalyst sintering, etc., lead to catalyst deactivation and denitrification performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Catalyst component is in the present embodiment: LaVO 4 Accounting for 1.4wt%, WO 3 Accounting for 5wt%, Al 2 o 3 5wt%, TiO 2 Accounting for 88.6wt%.

[0027] The preparation process of catalyst in the present embodiment is as follows:

[0028] 1) Under the condition of 80℃ water bath, La(NO 3 ) 3 ·6H 2 O and NH 4 VO 3 Dissolved in deionized water to obtain A solution and B solution, wherein the molar ratio La(NO 3 ) 3 ·6H 2 O: NH 4 VO 3 = 1:1;

[0029] 2) Mix A solution and B solution, add dropwise ammonia water with a mass concentration of 20% during the mixing process, so that the pH value of the solution is 7, and react the obtained LaVO 4 Precipitation is filtered and washed, and dried at 120°C;

[0030] 3) Separate LaVO 4 , ammonium paratungstate, Al 2 o 3 and TiO 2 Powder mixing, adding water and stirring to obtain a slurry during the mixing process, in which LaVO 4 Accounting for 1.4wt%, WO 3 Accounting for 5wt%, Al 2 o 3 5wt%, TiO 2 Acc...

Embodiment 2

[0035] Catalyst component is in the present embodiment: LaVO 4 Accounting for 1.2wt%, WO 3 Accounting for 5wt%, Al 2 o 3 7wt%, TiO 2 Accounting for 86.8wt%.

[0036] The preparation process of catalyst in the present embodiment is as follows:

[0037] 1) Under the condition of 80℃ water bath, La(NO 3 ) 3 ·6H 2 O and NH 4 VO 3 Dissolved in deionized water to obtain A solution and B solution, wherein the molar ratio La(NO 3 ) 3 ·6H 2 O:NH 4 VO 3 = 1:1;

[0038] 2) Mix A solution and B solution, add dropwise ammonia water with a mass concentration of 20% during the mixing process, so that the pH value of the solution is 7, and react the obtained LaVO 4 Precipitation is filtered and washed, and dried at 120°C;

[0039] 3) Separate LaVO 4 , ammonium paratungstate, Al 2 o 3 and TiO 2 Powder mixing, adding water and stirring to obtain a slurry during the mixing process, in which LaVO 4 Accounting for 1.2wt%, WO 3 Accounting for 5wt%, Al 2 o 3 7wt%, TiO 2 Accoun...

Embodiment 3

[0044] Catalyst component is in the present embodiment: LaVO 4 Accounting for 1wt%, WO 3 Accounting for 7wt%, Al 2 o 3 8wt%, TiO 2 Accounting for 84wt%.

[0045] The preparation process of catalyst in the present embodiment is as follows:

[0046] 1) Under the condition of 80℃ water bath, La(NO 3 ) 3 ·6H 2 O and NH 4 VO 3 Dissolved in deionized water to obtain A solution and B solution, wherein the molar ratio La(NO 3 ) 3 ·6H 2 O:NH 4 VO 3 = 1:1;

[0047] 2) Mix A solution and B solution, add dropwise ammonia water with a mass concentration of 20% during the mixing process, so that the pH value of the solution is 7, and react the obtained LaVO 4 Precipitation is filtered and washed, and dried at 120°C;

[0048] 3) Separate LaVO 4 , ammonium paratungstate, Al 2 o 3 and TiO 2 Powder mixing, adding water and stirring to obtain a slurry during the mixing process, in which LaVO 4 Accounting for 1wt%, WO 3 Accounting for 7wt%, Al 2 o 3 8wt%, TiO 2 84wt%;

...

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Abstract

The invention provides a rare earth vanadate SCR denitration catalyst, which includes LaVO4 as an active component, WO3 and Al2O3 as additives and TiO2 as a carrier. The LaVO4 is used as the active component, wherein La can inhibit sintering and crystal form transformation of the carrier, TiO2, at high temperature, thereby improving thermostability of the catalyst. Vanadium exists in the form of vanadate, so that required active sites for an SCR reaction are supplied, and sintering and volatilization of the vanadium at high temperature are prevented, thereby reducing environment pollution. In conclusion, the catalyst has excellent high temperature activity and thermostability, and can be used for controlling emission of NOx in high-temperature flue gas from gas turbine engines and the like.

Description

technical field [0001] The invention relates to the field of flue gas denitrification, in particular to a rare earth vanadate catalyst and a preparation method thereof which can be used to treat nitrogen oxide emissions from high-temperature flue gas such as gas turbines. Background technique [0002] Due to the advantages of gas turbine and the continuous development of its technology, it has become an important way for power supply and heat supply in developed countries. With the improvement of emission standards in various countries, the environmental protection of gas turbines has gradually received attention. Gas turbine units have begun to explore denitrification transformation, and denitrification positions have been reserved in new units. [0003] The industry's most widely used V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Catalysts, whose optimum temperature window is 300°C-400°C, are not suitable for high-temperature flue gas (above 500°C) emitted by gas turbines. Under high...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01J23/002B01D53/8628B01J23/30B01J2523/00B01J2523/3706B01J2523/47B01J2523/55B01J2523/69B01J2523/31
Inventor 林啟维吴新谦胡建锋吴晓东
Owner LONGYAN ZIJIN INNOVATION RES INST
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