Low-temperature vanadium-titanium-based SCR denitrification catalyst and preparation method thereof

A denitration catalyst, vanadium-titanium-based technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc. The effect of oxygen capacity, good denitration effect

Pending Publication Date: 2019-11-29
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing low-temperature catalysts are unstable and prone to S0 2 and H 2 O poisoning, life is difficult to guarantee

Method used

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  • Low-temperature vanadium-titanium-based SCR denitrification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare 4% V by impregnation 2 o 5 -4% La 2 o 3 -3% WO 3 / TiO 2 (mass ratio) catalyst and used for industrial flue gas SCR denitrification. The specific implementation steps are as follows:

[0025] Weigh 0.256g ammonium metavanadate, 0.184g lanthanum oxide, 0.148g ammonium metatungstate, dissolve and mix uniformly to obtain a precursor solution; 4.30g anatase TiO 2 The carrier was immersed in the above metal precursor solution, mixed evenly, and dried at 110°C for 10 hours to obtain catalyst powder. The catalyst powder was calcined at 550°C for 2 hours to obtain 4% V 2 o 5 -4% La 2 o 3 -3% WO 3 / TiO 2 Low temperature SCR denitrification catalyst.

[0026] 4% V prepared by the above method 2 o 5 -4% La 2 o 3 -3% WO 3 / TiO 2 The catalyst is placed in a fixed bed reactor, and the reaction gas composition is (volume ratio) 500ppm NO, 500ppm NH 3 , 100ppm SO 2 , 6%O 2 , 10%H 2 O, N 2 As the carrier gas, the space velocity (GHSV) is 48000h -1 . The ...

Embodiment 2

[0028] Prepare 3% V by impregnation 2 o 5 -4%Sc 2 o 3 -8%MoO 3 / TiO 2 (mass ratio) catalyst and used for industrial flue gas SCR denitrification. The specific implementation steps are as follows:

[0029] Weigh 0.205g ammonium metavanadate, 0.710g scandium nitrate, 0.520g ammonium paratungstate, dissolve and mix uniformly to obtain a precursor solution; 4.30g anatase TiO 2 The carrier is immersed in the above metal precursor solution, mixed evenly, and dried at 100° C. for 12 hours to obtain a powder. The powder was calcined at 450°C for 5 hours to obtain 3% V 2 o 5 -4%Sc 2 o 3 -8%MoO 3 / TiO2 Low temperature SCR denitrification catalyst.

[0030] 3% V prepared by the above method 2 o 5 -4%Sc 2 o 3 -8%MoO 3 / TiO 2 The catalyst is placed in a fixed bed reactor, and the reaction gas composition is (volume ratio) 1000ppmNO, 1000ppmNH 3 , 800ppm SO 2 , 3%O 2 , 10%H 2 O, N 2 As the carrier gas, the space velocity (GHSV) is 48000h -1 . The catalyst is NO at 1...

Embodiment 3

[0032] Prepare 3% V by impregnation 2 o 5 -7%CeO 2 -7% WO 3 / TiO 2 (mass ratio) catalyst and used for SCR denitrification of industrial flue gas. The specific implementation steps are as follows:

[0033] Weigh 0.191g ammonium metavanadate, 0.878g cerium nitrate, 0.372g ammonium metatungstate, dissolve and mix uniformly to obtain a precursor solution; 4.30g anatase TiO 2 The carrier was immersed in the above metal precursor solution, mixed evenly, and dried at 100°C for 8 hours to obtain a powder. The powder was calcined at 500°C for 4 hours to obtain 3% V 2 o 5 -7%CeO 2 -7% WO 3 / TiO 2 Low temperature SCR denitrification catalyst.

[0034] 3% V prepared by the above method 2 o 5 -7%CeO 2 -7% WO 3 / TiO 2 The catalyst is placed in a fixed bed reactor, and the reaction gas composition is (volume ratio) 600ppm NO, 600ppm NH 3 , 200ppm SO 2 , 4%O 2 , 10%H 2 O, N 2 As the carrier gas, the space velocity (GHSV) is 42000h -1 . Experiments show that the catalyst...

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Abstract

The invention discloses a low-temperature vanadium-titanium-based SCR denitrification catalyst and a preparation method thereof. According to the present invention, a vanadium oxide V2O5 and a rare earth oxide are used as active components so as to provide the synergistic effect between the V and the rare earth metal, wherein V2O5 provides more acid sites and inhibits the adsorption of SO2 and H2Oon metal active sites, and the rare earth oxide effectively improves the oxygen storage capacity and the catalytic activity of the catalyst in a low-temperature region; and the catalyst has good denitrification effect within a range of 170-280 DEG C, and has good SO2 resistance and good H2O resistance.

Description

technical field [0001] The invention belongs to the technical field of catalytic purification of industrial flue gas, and in particular relates to a low-temperature vanadium-titanium-based SCR denitration catalyst and a preparation method thereof. Background technique [0002] At present, the global energy structure is still dominated by fossil fuel combustion, as NO x Industrial industries (including power industry and non-electric industry) that are the main emission sources are especially due to NO x The amount of generation is so huge that it has been included in the key targets of energy conservation and emission reduction in my country. in NO x Among the removal technologies, Selective Catalytic Reduction (SCR) is the most widely used flue gas denitrification technology at home and abroad. At present, the most mature denitrification catalyst for commercial application is V 2 o 5 -WO 3 / TiO 2 Catalyst, its V 2 o 5 As the main active ingredient, WO 3 As a cocat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/28B01D53/86B01D53/56
CPCB01J23/30B01J23/28B01J23/002B01D53/8628B01D2258/0283B01J2523/00B01J2523/36B01J2523/47B01J2523/55B01J2523/68B01J2523/3712B01J2523/69B01J2523/35B01J2523/3706
Inventor 吴孝敏荆国华陈子逸吕碧洪黄志伟申华臻贺艳艳郭志航周作明
Owner HUAQIAO UNIVERSITY
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