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Sulfated vanadium-chromium-titanium denitration catalyst as well as preparation method and application thereof

A sulfation and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as limited applications

Active Publication Date: 2021-09-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, traditional NH 3 -SCR denitrification catalyst is mainly V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 , the catalyst has good activity only in the range of 300-400 °C, considering the characteristics of the large temperature fluctuation range of stationary source flue gas and diesel vehicle exhaust, V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 The narrow activity temperature window of the catalyst limits its x Applications in removal

Method used

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  • Sulfated vanadium-chromium-titanium denitration catalyst as well as preparation method and application thereof
  • Sulfated vanadium-chromium-titanium denitration catalyst as well as preparation method and application thereof
  • Sulfated vanadium-chromium-titanium denitration catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Sulfated 1% V 2 o 5 -5%Cr 2 o3 / TiO 2 Catalyst preparation

[0026] a) Take 2.1ml of 0.10mol / L ammonium metavanadate solution and 3.3ml of 0.40mol / L chromium nitrate solution, add deionized water, stir in a water bath at 30°C to obtain a mixed solution; add 1.88g of titanium dioxide to the mixed solution, stirred for 2 hours to obtain a slurry;

[0027] b) Dry the slurry prepared in step a) at 120°C for 12 hours to obtain a dry sample; place the sample in a muffle furnace and bake at 600°C for 4 hours to obtain 1% V 2 o 5 -5%Cr 2 o 3 / TiO 2 catalyst;

[0028] c) Pass the catalyst prepared in step b) into 500ppm SO 2 , 5%O 2 , using nitrogen as the balance gas, the flow rate is 300ml / min, sulfurated at 400°C for 1 hour, and the sulfated 1% V 2 o 5 -5%Cr 2 o 3 / TiO 2 catalyst.

Embodiment 2

[0029] Example 2: Sulfated 2% V 2 o 5 -1%Cr 2 o 3 / TiO 2 Catalyst preparation

[0030] a) Take 2.1ml of 0.20mol / L ammonium metavanadate solution and 1.3ml of 0.20mol / L chromium nitrate solution, add deionized water, stir in a water bath at 60°C to obtain a mixed solution; add 1.94g of titanium dioxide to the mixed solution solution, stirred for 6 hours to obtain a slurry;

[0031] b) Dry the slurry prepared in step a) at 100°C for 24 hours to obtain a dry sample; place the sample in a muffle furnace and bake at 400°C for 8 hours to obtain 2% V 2 o 5 -1%Cr 2 o 3 / TiO 2 catalyst;

[0032] c) Pass the catalyst prepared in step b) into 100ppm SO 2 , 10%O 2 , using nitrogen as the balance gas, the flow rate is 500ml / min, sulfurated at 200 ° C for 12 hours, to obtain the sulfated 2% V 2 o 5 -1%Cr 2 o 3 / TiO 2 catalyst.

Embodiment 3

[0033] Example 3: Sulfated 2% V 2 o 5 -2%Cr 2 o 3 / TiO 2 Catalyst preparation

[0034] a) Take 2.1ml of 0.20mol / L ammonium metavanadate solution and 2.6ml of 0.20mol / L chromium nitrate solution, add deionized water, stir in a water bath at 40°C to obtain a mixed solution; add 1.92g of titanium dioxide to the mixed solution solution, stirred for 4 hours to obtain a slurry;

[0035] b) Dry the slurry prepared in step a) at 120°C for 12 hours to obtain a dry sample; place the sample in a muffle furnace and bake at 500°C for 6 hours to obtain 2% V 2 o 5 -2%Cr 2 o 3 / TiO 2 catalyst;

[0036] c) Pass the catalyst prepared in step b) into 200ppm SO 2 , 5%O 2 , use nitrogen as balance gas, flow rate is 300ml / min, sulfation at 400°C for 3 hours, to obtain sulfated 2% V 2 o 5 -2%Cr 2 o 3 / TiO 2 catalyst.

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Abstract

The invention relates to a sulfated vanadium-chromium-titanium denitration catalyst as well as a preparation method and application thereof, and belongs to the fields of air pollution control technology and environmental catalysis. The catalyst is obtained by sulfating with titanium dioxide serving as a carrier, V2O5 serving as a main active component and Cr2O3 serving as an auxiliary agent. The sulfated vanadium-chromium-titanium catalyst prepared by the method has good activity in the ammonia selective catalytic reduction NOx reaction, the NOx conversion rate is 80% or above within the range of 250-450 DEG C and the air speed is 100000 h<-1>, and the sulfated vanadium-chromium-titanium catalyst has good sulfur resistance. The catalyst disclosed by the invention can be used for efficiently removing NOx in stationary source flue gas and diesel vehicle tail gas.

Description

technical field [0001] The invention relates to a method for ammonia selective catalytic reduction (Selective catalytic reduction, SCR) NO x Sulfated vanadium-chromium-titanium catalyst and its preparation method and application, the denitration catalyst is suitable for NO in stationary source flue gas and diesel vehicle exhaust x The elimination belongs to the field of air pollution control technology and environmental catalysis. Background technique [0002] Nitrogen oxides (NO x ) as one of the main air pollutants, causing great harm to environmental quality and human health. Therefore, NO x The control of pollution is of great significance to environmental protection and sustainable development. NH 3 -SCR is currently the most widely used NO x The core of the removal technology is an efficient and stable denitration catalyst. Currently, traditional NH 3 -SCR denitrification catalyst is mainly V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 , the catalyst has good activity only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01J23/26B01J37/03B01J37/08B01J37/00B01D53/86B01D53/94B01D53/56
CPCB01J27/053B01J23/26B01J23/002B01J37/038B01J37/088B01J37/00B01D53/8628B01D53/9413B01J2523/00B01D2258/012B01D2258/0283B01D2257/404B01J2523/47B01J2523/55B01J2523/67Y02T10/12Y02A50/20
Inventor 刘志明刘洪魁
Owner BEIJING UNIV OF CHEM TECH
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