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a high performance nh 3 ‑scr catalyst and its preparation method and use

A supported catalyst, tio2-cuo technology, used in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as poor low temperature activity and sulfur resistance, limitations, etc. Simple and fast effects

Active Publication Date: 2017-10-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor low-temperature activity and sulfur resistance of Ce-Ti oxide catalysts also limit their practical applications.

Method used

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  • a high performance nh <sub>3</sub> ‑scr catalyst and its preparation method and use
  • a high performance nh <sub>3</sub> ‑scr catalyst and its preparation method and use
  • a high performance nh <sub>3</sub> ‑scr catalyst and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation of embodiment 1.Ti1 / Ce9 sample

[0022] Accurately measure 0.4437g of n-tetrabutyl titanate and slowly add it dropwise to 22ml of absolute ethanol (containing 2ml of CH 3 COOH, to inhibit the hydrolysis of n-butyl titanate), magnetically stir in an ice-water bath to make it evenly mixed, and then add 2g CeO 2 into the solution and continued to stir for 2h to obtain a suspension. Finally, the suspension was evaporated to dryness in an oil bath to obtain a powdery substance, which was dried in an oven at 110°C for 12 hours, ground evenly, and then calcined at 500°C for 4 hours in an air atmosphere in a muffle furnace to obtain Ti1 / Ce9 supported catalyst. Its XRD, H 2 -TPR and NH 3 -SCR activity results are attached figure 1 -3.

Embodiment 2

[0023] Example 2. Ti1Cu 0.001 / CeO 2 Catalyst preparation

[0024] Accurately measure 0.4437g n-tetrabutyl titanate and 0.116ml 0.1mol / L copper nitrate solution and slowly add it dropwise to 22ml absolute ethanol (containing 2ml CH 3 COOH, to inhibit the hydrolysis of n-butyl titanate), magnetically stir in an ice-water bath to make it evenly mixed, and then add 2g CeO 2into the solution and continued to stir for 2h to obtain a suspension. Finally, the suspension was evaporated to dryness in an oil bath to obtain a powdery substance, which was dried in an oven at 110°C for 12 hours, ground evenly, and then calcined at 500°C for 4 hours in an air atmosphere in a muffle furnace to obtain Ti1Cu 0.001 / CeO 2 supported catalyst. Its XRD, H 2 -TPR and NH 3 -SCR activity results are attached figure 1 -3.

Embodiment 3

[0025] Example 3. Ti1Cu 0.005 / CeO 2 Catalyst preparation

[0026] Accurately measure 0.4437g n-tetrabutyl titanate and 0.581ml 0.1mol / L copper nitrate solution and slowly add it dropwise to 22ml absolute ethanol (containing 2ml CH 3 COOH, to inhibit the hydrolysis of n-butyl titanate), magnetically stir in an ice-water bath to make it evenly mixed, and then add 2g CeO 2 into the solution and continued to stir for 2h to obtain a suspension. Finally, the suspension was evaporated to dryness in an oil bath to obtain a powdery substance, which was dried in an oven at 110°C for 12 hours, ground evenly, and then calcined at 500°C for 4 hours in an air atmosphere in a muffle furnace to obtain Ti1Cu 0.005 / CeO 2 supported catalyst. Its XRD, H 2 -TPR and NH 3 -SCR activity results are attached figure 1 -3.

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Abstract

The invention discloses a simple and rapid method for preparing a TiO2-CuO / CeO2 supported catalyst. The method comprises the following steps: uniformly mixing a certain amount of butyl titanate and copper nitrate in an ice water bath; subsequently adding a certain amount of CeO2 and stirring again to obtain a turbid liquid; and finally drying by evaporation in an oil bath, drying and roasting to obtain the TiO2-CuO / CeO2 catalyst. The catalyst prepared by the method disclosed by the invention has the advantages that the catalyst is excellent in catalytic performance and high in thermal stability in an NH3-SCR reaction; the required raw materials are cheap, easily available and sufficient in resources; the preparation process is simple and convenient, has no special requirements on equipment and is low in energy consumption, small in pollution and environmental friendly; the catalyst is suitable for large-scale production and has a latent industrial application prospect.

Description

Technical field: [0001] The present invention relates to a kind of TiO 2 -CuO / CeO 2 A preparation method of a supported catalyst, the prepared catalyst and its application in flue gas denitrification of coal-fired power plants. Background technique: [0002] In recent years, smog weather has frequently appeared in our country, and the air quality problem has attracted great attention from the whole society. Nitrogen oxides (NOx) in flue gas from coal-fired power plants x ) emissions have seriously polluted the atmospheric environment, therefore, how to effectively eliminate nitrogen oxides has become an important topic of concern in the current environmental protection field. [0003] NH 3 -SCR (Selective catalytic reduction, selective catalytic reduction) technology is currently recognized at home and abroad as the most promising method for purifying NOx. with TiO 2 as the carrier, the load V 2 o 5 -WO 3 or V 2 o 5 -MoO 3 Catalysts such as oxides have been widel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01D53/56B01D53/86
Inventor 董林李露露张雷邹伟欣汤常金高飞
Owner NANJING UNIV